On the Hydrogen Recombination Time in Type II Supernova Atmospheres (2009)
De, Soma, Baron, E., Hauschildt, P. H.
NLTE radiative transfer calculations of differentially expanding supernovae atmospheres are computationally intensive and are almost universally performed in time-independent snapshot mode. The...
Knop, S., Hauschildt, P. H., Baron, E.
A solution of the radiative-transfer problem in arbitrary velocity fields introduced in a previous paper, has limitations in its applicability. For large-scale applications, the methods described...
3D Radiative Transfer with PHOENIX (2009)
Baron, E., Chen, Bin, Hauschildt, P. H.
Using the methods of general relativity Lindquist derived the radiative transfer equation that is correct to all orders in v/c. Mihalas developed a method of solution for the important case of...
Witte, S., Helling, Ch., Hauschildt, P. H.
Substellar objects have extremely long life-spans. The cosmological consequence for older objects are low abundances of heavy elements, which results in a wide distribution of objects over...
Time-dependent radiative transfer with PHOENIX (2009)
Jack, D., Hauschildt, P. H., Baron, E.
Aims. We present first results and tests of a time-dependent extension to the general purpose model atmosphere code PHOENIX. We aim to produce light curves and spectra of hydro models for all types...
Physical parameters of T dwarfs derived from high-resolution near-infrared spectra (2009)
Del Burgo, C., Martin, E. L., Osorio, M. R. Zapatero, Hauschildt, P. H.
We determine the effective temperature, surface gravity and projected rotational velocity of nine T dwarfs from the comparison of high-resolution near-infrared spectra and synthetic models, and...
Radiative transfer in circumstellar disks - I. 1D models for GQ Lupi (2009)
Huegelmeyer, S. D., Dreizler, S., Hauschildt, P. H., Seifahrt, A., Homeier, D., Barman, T.
We present a new code for the calculation of the 1D structure and synthetic spectra of accretion disks. The code is an extension of the general purpose stellar atmosphere code PHOENIX and is...
Analyzing SN2003Z with PHOENIX (2009)
Knop, S., Hauschildt, P. H., Baron, E., Dreizler, S.
We present synthetic spectra around maximum for the type II supernova SN 2003Z, which was first detected on January 29.7 2003. Comparison with observed spectra aim at the determination of physical...
A new formal solution of the radiative transfer in arbitrary velocity fields (2009)
Knop, S., Hauschildt, P. H., Baron, E.
We present a new formal solution of the Lagrangian equation of radiative transfer that is useful in solving the equation of radiative transfer in the presence of arbitrary velocity fields. Normally a...
Ab initio modeling of molecular IR spectra of astrophysical interest: Application to CH4 (2009)
Warmbier, R., Schneider, R., Sharma, A. R., Braams, B. J., Bowman, J. M., Hauschildt, P. H.
Non-LTE modeling of the near UV band of late-type stars (2008)
Short, C. Ian, Hauschildt, P. H.
We investigate the ability of both LTE and Non-LTE models to fit the near UV band absolute flux distribution and individual spectral line profiles of three standard stars for which high quality...
Direct evidence of a sub-stellar companion around CT Cha (2008)
Schmidt, T. O. B., Neuhäuser, R., Seifahrt, A., Vogt, N., Bedalov, A., Helling, Ch., ...
In our ongoing search for close and faint companions around T Tauri stars, we found a very faint (Ks=14.9mag, Ks_0=14.4mag) object, just ~2.67" northwest of the Chamaeleon star-forming region member...
Multi-layered Spectral Formation in SNe Ia Around Maximum Light (2008)
Bongard, S., Baron, E., Smadja, G., Branch, D., Hauschildt, P. H.
We use the radiative transfer code PHOENIX to study the line formation of the wavelength region 5000-7000 Angstroms. This is the region where the SNe Ia defining Si II feature occurs. This region is...
Johnas, C. M. S., Helling, Ch., Dehn, M., Woitke, P., Hauschildt, P. H.
We aim to understand the correlation between cloud formation and alkali line formation in substellar atmospheres.We perform line profile calculations for Na I and K I based on the coupling of our...
Nlte Modeling Of Sne Ia Near Maximum Light (2007)
Baron Dept, E. Baron, P. H. Hauschildt, A. Mezzacappa
. Modeling the atmospheres of SNe Ia requires the solution of the NLTE radiative transfer equation. We discuss the formulation of the radiative transfer equation in the co-moving frame. For...
Radiative Transfer in the Co-Moving Frame (2007)
Baron Hauschildt, E. Baron, P. H. Hauschildt
We discuss the formulation of the radiative transfer equation in the co-moving frame. For characteristic velocities larger than ¸ 2000 km s \Gamma1 , the effects of advection on the synthetic...
NLTE Effects in Modeling of Supernovae near Maximum (2007)
E. Baron, P. H. Hauschildt, P. Nugent, D. Branch
Supernovae, with their diversity of compositions, velocities, envelope masses, and interactions are good testing grounds for probing the importance of NLTE in expanding
main sequence of globular clusters and halo field stars (2007)
I. Baraffe, G. Chabrier, F. Allard, P. H. Hauschildt
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
S. Dreizler, P. H. Hauschildt, W. Kley, T. Rauch, S. L. Schuh, K. Werner, ...
received; accepted Abstract. Recently, 59 low-luminosity object transits were reported from the Optical Gravitational Lensing Experiment (OGLE). Our follow-up low-resolution spectroscopy of 16...
J. G. Doyle, P. H. Hauschildt, W. Livingston, I. Vince
Received date, accepted date Abstract. We present a solution for the long standing problem concerning the `chromospheric ' behaviour of the Mn i 5395/5432 A lines in the solar spectrum using...
P. H. Hauschildt, E. Baron, Peter Nugent, David Branch, Cepheid Variable Stars
Abstract. We present NLTE synthetic spectra for the Type Ia supernovae SN 1992A SN 1981B, and SN 1991bg near maximum light. At this epoch both of the normal SNe Ia (SNe 1981b and 1992A) were observed...
A high resolution spectral atlas of brown dwarfs (2007)
Reiners, A., Homeier, D., Hauschildt, P. H., Allard, F.
We present a UVES/VLT high resolution atlas of three L dwarfs and one T dwarf system, spectral classes at which most of the objects are brown dwarfs. Our atlas covers the optical region from...
The Early Spectrophotometric Evolution of V1186 Scorpii (Nova Scorpii 2004 #1) (2007)
Schwarz, G. J., Woodward, C. E., Bode, M. F., Evans, A., Eyres, S. P., Geballe, T. R., ...
We report optical photometry and optical through mid-infrared spectroscopy of the classical nova V1186 Sco. This slowly developing nova had an complex light curve with multiple secondary peaks...
Lançon, A., Hauschildt, P. H., Ladjal, D., Mouhcine, M.
We provide a grid of PHOENIX spectra of red giant and supergiant stars, that extend through optical and near-IR wavelengths. For the first time, models are also provided with modified surface...
Lithium abundances of very low mass members of Chamaeleon I (2007)
Johnas, C. M. S., Guenther, E. W., Joergens, V., Schweitzer, A., Hauschildt, P. H.
Aims.We present the first study of the lithium abundances of very low mass objects in Chamaeleon I close to the hydrogen burning mass limit based on atmospheric models and high-resolution...
The effects of new Na | D line profiles in cool atmospheres (2007)
Johnas, C.M.S., Hauschildt, P.H., Schweitzer, A., Mullamphy, D.F.T., Peach, G., Whittingham, I.B.
Aims. New Na | D line profiles and their effects on synthetic spectra of cool dwarfs computed with PHOENIX are studied. Sodium is the most abundant alkali in cool dwarf atmospheres and mostly...
Determination of stellar shape in microlensing event MOA 2002-BLG-33 (2006)
Rattenbury, N.J., Abe, F., Bennett, D.P., Bond, I.A., Calitz, J.J., Claret, A., ...
We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the...
Determination of stellar shape in microlensing event MOA 2002-BLG-33 (2006)
Rattenbury, N.J., Abe, F., Bennett, D.P., Bond, I.A., Calitz, J.J., Claret, A., ...
We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the...
Determination of stellar shape in microlensing event MOA 2002-BLG-33 (2006)
Rattenbury, N.J., Abe, F., Bennett, D.P., Bond, I.A., Calitz, J.J., Claret, A., ...
We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the...
General Relativistic Radiative Transfer (2006)
Knop, S., Hauschildt, P. H., Baron, E.
We present a general method to calculate radiative transfer including scattering in the continuum as well as in lines in spherically symmetric systems that are influenced by the effects of general...
Type Ia Supernova Spectral Line Ratios as Luminosity Indicators (2006)
Bongard, S., Baron, E., Smadja, G., Branch, D., Hauschildt, P.H.
Type Ia supernovae have played a crucial role in the discovery of the dark energy, via the measurement of their light curves and the determination of the peak brightness via fitting templates to the...
Quantitative Spectroscopy of Supernovae for Dark Energy Studies (2006)
Baron, E., Branch, D., Jeffery, D., Nugent, P., Thomas, R., Bongard, S., ...
Detailed quantitative spectroscopy of Type Ia supernovae (SNe~Ia) provides crucial information needed to minimize systematic effects in both ongoing SNe Ia observational programs such as the Nearby...
We constructed hydrodynamical model atmospheres for mid M-type main-, as well as pre-main-sequence (PMS) objects. Despite the complex chemistry encountered in these cool atmospheres a reasonably...
The M Dwarf GJ 436 and its Neptune-Mass Planet (2006)
Maness, H. L., Marcy, G. W., Ford, E. B., Hauschildt, P. H., Shreve, A. T., Basri, G. B., ...
We determine stellar parameters for the M dwarf GJ 436 that hosts a Neptune-mass planet. We employ primarily spectral modeling at low and high resolution, examining the agreement between model and...
Kucinskas, A., Hauschildt, P. H., Brott, I., Vansevicius, V., Lindegren, L., Tanabe, T., ...
(Abridged) We investigate the effects of metallicity on the broad-band photometric colors of late-type giants, and make a comparison of synthetic colors with observed photometric properties of...
Steps for Solving the Transfer Equation for Arbitrary Flows in Stationary Spacetimes (2006)
Chen, B., Kantowski, R., Baron, E., Knop, S., Hauschildt, P. H.
We derive the radiative transfer equation for arbitrary stationary relativistic flows in stationary spacetimes, i.e. for steady-state transfer problems. We show how the standard characteristics...
NLTE Strontium and Barium in metal poor red giant stars (2006)
Short, C. I., Hauschildt, P. H.
We present atmospheric models of red giant stars of various metallicities, including extremely metal poor (XMP, [Fe/H]
Convection and observable properties of late-type giants (2005)
Kucinskas, A., Hauschildt, P. H.
We show that contrary to what is expected from 1D stationary model atmospheres, 3D hydrodynamical modeling predicts a considerable influence of convection on the spectral properties of late-type...
Photometric colors of late-type giants: theory versus observations (2005)
Kucinskas, A., Hauschildt, P. H., Brott, I., Vansevicius, V., Lindegren, L., ...
To assess the current status in the theoretical modeling of the spectral properties of late-type giants, we provide a comparison of synthetic photometric colors of late-type giants (calculated with...
The physics of extrasolar gaseous planets : from theory to observable signatures (2005)
Chabrier, Gilles, Allard, F., Baraffe, I., Barman, T., Hauschildt, P. H.
We review our present understanding of the physical properties of substellar objects, brown dwarfs and irradiated or non-irradiated gaseous exoplanets. This includes a description of their internal...
The low-mass companion of GQ Lup (2005)
Guenther, E. W., Neuhaeuser, R., Wuchterl, G., Mugrauer, M., Bedalov, A., Hauschildt, P. H.
Using NACO on the VLT in the imaging mode we have detected an object at a distance of only 0.7 arcsec from GQ Lup. The object turns out to be co-moving. We have taken two K-band spectra with a...
Kucinskas, A., Hauschildt, P. H., Brott, I., Vansevicius, V., Lindegren, L., ...
We present new synthetic broad-band photometric colors for late-type giants based on synthetic spectra calculated with the PHOENIX model atmosphere code. The grid covers effective temperatures...
Review on low-mass stars and brown dwarfs (2005)
Chabrier, G., Baraffe, I., Allard, F., Hauschildt, P. H.
In this review, we examine the successes and weaknesses of modern low-mass star and brown dwarf theory.(1) We first focus on the mechanical (equation of state) and thermal (atmosphere) properties and...
6^Li in the atmosphere of GJ 117 (2005)
Christian, D. J., Mathioudakis, M., Jevremovic, D., Hauschildt, P. H., Baron, E.
We present high resolution VLT UVES observations of the active K dwarf GJ 117. 6^Li enhancement has been shown for energetic solar events, one chromospherically active binary, and several dwarf halo...
Baraffe, I., Chabrier, Gilles, Allard, F., Hauschildt, P.H.
We analyse pre-Main Sequence evolutionary tracks for low mass stars with masses $m \\le 1.4 \\msol$ based on the Baraffe et al. (1998) input physics. We also extend the recent Chabrier et al. (2000)...
The effect of evaporation on the evolution of close-in giant planets (2005)
Baraffe, I., Selsis, F., Chabrier, Gilles, Barman, T. S., Allard, F., Hauschildt, P. H., ...
We include the effect of evaporation in our evolutionary calculations of close-in giant planets, based on a recent model for thermal evaporation taking into account the XUV flux of the parent star...
Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945 (2005)
Baraffe, I., Chabrier, Gilles, Barman, T., Allard, F., Hauschildt, P. H.
We present evolutionary models for cool brown dwarfs and extra-solar giant planets. The models reproduce the main trends of observed methane dwarfs in near-IR color-magnitude diagrams. We also...
Baron, E., Nugent, P.E., Branch, D., Hauschildt, P.H.
Due to their intrinsic brightness, supernovae make excellent cosmological probes. We describe the SEAM method for obtaining distances to Type IIP supernovae (SNe IIP) and present a distance to SN...
Determination of stellar shape in microlensing event MOA 2002-BLG-33 (2005)
Rattenbury, N. J., Abe, F., Bennett, D. P., Bond, I. A., Calitz, J. J., Claret, A., ...
We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the...
PHOENIX model chromospheres of mid- to late-type M dwarfs (2005)
Fuhrmeister, B., Hauschildt, P. H.
We present semi-empirical model chromospheres computed with the atmosphere code PHOENIX. The models are designed to fit the observed spectra of five mid- to late-type M dwarfs. Next to hydrogen lines...
Hot-Jupiters and hot-Neptunes: a common origin? (2005)
Baraffe, I., Chabrier, G., Barman, T. S., Selsis, F., Allard, F., Hauschildt, P. H.
We compare evolutionary models for close-in exoplanets coupling irradiation and evaporation due respectively to the thermal and high energy flux of the parent star with observations of recently...
Evidence for a co-moving sub-stellar companion of GQ Lup (2005)
Neuhaeuser, R., Guenther, E. W., Wuchterl, G., Mugrauer, M., Bedalov, A., Hauschildt, P. H.
We present a companion of the \le 2 Myr young classical T Tauri star GQ Lup in the Lupus star forming region at 140 \pm 50 pc from imaging, astrometry, and spectroscopy. With direct K-band imaging...
A Phoenix Modelatmosphere Grid For GAIA (2005)
We present the results of a set of model atmospheres and synthetic spectra computed with the PHOENIX code. The models cover a range of effective temperatures 2700 K
Theoretical modelling of late-type giant atmospheres: preparing for Gaia (2005)
Kucinskas, A., Brott, I., Hauschildt, P. H., Lindegren, L., Tanabe, T., ...
Late type giants (RGB/AGB stars) will be important tracers of the Galactic morphology and evolution in the framework of Gaia, as they are intrinsically bright and thus can probe distant stellar...
Determination of stellar shape in microlensing event MOA 2002-BLG-33 (2005)
Rattenbury, N.J., Abe, F., Bennett, D.P., Bond, I.A., Calitz, J.J., Claret, A., ...
We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the...
Determination of stellar shape in microlensing event MOA 2002-BLG-33 (2005)
Rattenbury, N.J., Abe, F., Bennett, D.P., Bond, I.A., Calitz, J.J., Claret, A., ...
We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the...
Type Ia Supernova Spectral Line Ratios as Luminosity Indicators (2005)
Bongard, S., Baron, E., Smadja, G., Branch, D., Hauschildt, P.H.
Type Ia supernovae have played a crucial role in the discovery of the dark energy, via the measurement of their light curves and the determination of the peak brightness via fitting templates to the...
Quantitative Spectroscopy of Supernovae for Dark Energy Studies (2005)
Baron, E., Branch, D., Jeffery, D., Nugent, P., Thomas, R., Bongard, S., ...
Detailed quantitative spectroscopy of Type Ia supernovae (SNe~Ia) provides crucial information needed to minimize systematic effects in both ongoing SNe Ia observational programs such as the Nearby...
A NLTE line blanketed model of a solar type star (2004)
Short, C. I., Hauschildt, P. H.
We present LTE and NLTE atmospheric models of a star with solar parameters, and study the effect of treating many thousands of Iron group lines out of LTE on the computed atmospheric structure,...
Molecular line opacity of LiCl in the mid-infrared spectra of brown dwarfs (2004)
Weck, P. F., Schweitzer, A., Kirby, K., Hauschildt, P. H., Stancil, P. C.
We present a complete line list for the X 1Sigma+ electronic ground state of LiCl computed using fully quantum-mechanical techniques. This list includes transition energies and oscillator strengths...
The effect of evaporation on the evolution of close-in giant planets (2004)
Baraffe, I., Selsis, F., Chabrier, G., Barman, T. S., Allard, F., Hauschildt, P. H., ...
We include the effect of evaporation in our evolutionary calculations of close-in giant planets, based on a recent model for thermal evaporation taking into account the XUV flux of the parent star...
The physics of extrasolar gaseous planets : from theory to observable signatures (2004)
Chabrier, G., Allard, F., Baraffe, I., Barman, T., Hauschildt, P. H.
We review our present understanding of the physical properties of substellar objects, brown dwarfs and irradiated or non-irradiated gaseous exoplanets. This includes a description of their internal...
The physics of extrasolar gaseous planets : from theory to observable signatures (2004)
Chabrier, Gilles, Allard, F., Baraffe, I., Barman, T., Hauschildt, P. H.
We review our present understanding of the physical properties of substellar objects, brown dwarfs and irradiated or non-irradiated gaseous exoplanets. This includes a description of their internal...
The effect of evaporation on the evolution of close-in giant planets (2004)
Baraffe, I., Selsis, F., Chabrier, Gilles, Barman, T. S., Allard, F., Hauschildt, P. H., ...
We include the effect of evaporation in our evolutionary calculations of close-in giant planets, based on a recent model for thermal evaporation taking into account the XUV flux of the parent star...
Baron, E., Nugent, P.E., Branch, D., Hauschildt, P.H.
Due to their intrinsic brightness, supernovae make excellent cosmological probes. We describe the SEAM method for obtaining distances to Type IIP supernovae (SNe IIP) and present a distance to SN...
Baron, E., Nugent, P.E., Branch, D., Hauschildt, P.H.
Due to their intrinsic brightness, supernovae make excellent cosmological probes. We describe the SEAM method for obtaining distances to Type IIP supernovae (SNe IIP) and present a distance to SN...
The physics of extrasolar gaseous planets : from theory to observable signatures (2004)
Chabrier, Gilles, Allard, F., Baraffe, I., Barman, T., Hauschildt, P. H.
We review our present understanding of the physical properties of substellar objects, brown dwarfs and irradiated or non-irradiated gaseous exoplanets. This includes a description of their internal...
The effect of evaporation on the evolution of close-in giant planets (2004)
Baraffe, I., Selsis, F., Chabrier, Gilles, Barman, T. S., Allard, F., Hauschildt, P. H., ...
We include the effect of evaporation in our evolutionary calculations of close-in giant planets, based on a recent model for thermal evaporation taking into account the XUV flux of the parent star...
Probing the atmosphere of a solar-like star by galactic microlensing at high magnification (2003)
Abe, F., Bennett, D. P., Bond, I. A., Calitz, J. J., Claret, A., Cook, K. H., ...
We report a measurement of limb darkening of a solar-like star in the very high magnification microlensing event MOA 2002-BLG-33. A 15 hour deviation from the light curve profile expected for a...
2MASSJ0516288+260738: Discovery of the first eclipsing late K + Brown dwarf system? (2003)
Schuh, S. L., Handler, G., Drechsel, H., Hauschildt, P. H., Dreizler, S., Medupe, R., ...
We report the discovery of a new eclipsing system less than one arcminute south of the pulsating DB white dwarf KUV 05134+2605. The object could be identified with the point source...
Atmospheric models of red giants with massive scale NLTE (2003)
Short, C. I., Hauschildt, P. H.
We present plane-parallel and spherical LTE and NLTE atmospheric models of a variety of stellar parameters of the red giant star Arcturus (alpha Boo, HD124897, HR5340) and study their ability to fit...
High-Precicison Limb-Darkening Measurement of a K3 Giant Using Microlensing (2003)
Fields, Dale L., Albrow, M. D., An, J., Caldwell, J. A. R., DePoy, D. L., ...
We obtain high-precision limb-darkening measurements in five bands (V, V_E, I_E, I, and H) for the K3 III (Teff=4200 K, [Fe/H]=+0.3, log(g)=2.3) source of the Galactic bulge microlensing event EROS...
Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945 (2003)
Baraffe, I., Chabrier, G., Barman, T., Allard, F., Hauschildt, P. H.
We present evolutionary models for cool brown dwarfs and extra-solar giant planets. The models reproduce the main trends of observed methane dwarfs in near-IR color-magnitude diagrams. We also...
The Early Ultraviolet Evolution of the ONeMg Nova V382 Velorum 1999 (2003)
Shore, S. N., Schwarz, G., Bond, H. E., Downes, R. A., Starrfield, S., Evans, A., ...
We present a multiwavelength study of the ONeMg Galactic nova V382 Velorum 1999 using HST/STIS and FUSE ultraviolet spectra and comparisons with published groundbased optical spectra. We find a close...
Kasen, Daniel, Nugent, Peter, Wang, Lifan, Howell, D. A., Wheeler, J. Craig, Hoeflich, Peter, ...
SN 2001el is the first normal Type Ia supernova to show a strong, intrinsic polarization signal. In addition, during the epochs prior to maximum light, the CaII IR triplet absorption is seen...
Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945 (2003)
Baraffe, I., Chabrier, Gilles, Barman, T., Allard, F., Hauschildt, P. H.
We present evolutionary models for cool brown dwarfs and extra-solar giant planets. The models reproduce the main trends of observed methane dwarfs in near-IR color-magnitude diagrams. We also...
Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945 (2003)
Baraffe, I., Chabrier, Gilles, Barman, T., Allard, F., Hauschildt, P. H.
We present evolutionary models for cool brown dwarfs and extra-solar giant planets. The models reproduce the main trends of observed methane dwarfs in near-IR color-magnitude diagrams. We also...
Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458 (2003)
Baraffe, I., Chabrier, G., Barman, T. S., Allard, F., Hauschildt, P. H.
Methane Opacities in T Dwarf Atmospheres (2002)
Homeier, D., Hauschildt, P. H., Allard, F.
We present the current status of PHOENIX model atmospheres for dwarfs of the spectral type T, typical for older field brown dwarfs and low-mass brown dwarfs. The results are based on new predictions...
Numerical simulations of surface convection in a late M-dwarf (2002)
Based on detailed 2D and 3D numerical radiation-hydrodynamics (RHD) simulations of time-dependent compressible convection, we have studied the dynamics and thermal structure of the convective surface...
The Molecular Continuum Opacity of MgH in Cool Stellar Atmospheres (2002)
Weck, P. F., Schweitzer, A., Stancil, P. C., Hauschildt, P. H., Kirby, K.
The opacity due to photodissociation of 24MgH is investigated in the atmospheres of cool stars. The lowest two electronic transitions A 2Pi -- X 2Sigma+ and B' 2Sigma+ -- X 2 Sigma+ are considered...
Parallelization Strategies for ALI Radiative Transfer in Moving Media (2002)
Baron, E., Hauschildt, P. H., Lowenthal, D.
We describe the method we have used to parallelize our spherically symmetric special relativistic short characteristics general radiative transfer code PHOENIX. We describe some possible...
The Molecular Line Opacity of MgH in Cool Stellar Atmospheres (2002)
Weck, P. F., Schweitzer, A., Stancil, P. C., Hauschildt, P. H., Kirby, K.
A new, complete, theoretical rotational and vibrational line list for the A-X electronic transition in MgH is presented. The list includes transition energies and oscillator strengths for all...
The Spectral Energy Distribution and Mass-loss Rate of the A-Type Supergiant Deneb (2002)
Aufdenberg, J. P., Hauschildt, P. H., Baron, E., Nordgren, T. E., Howarth, I. D., Burnley, A. W., ...
A stellar wind module has been developed for the PHOENIX stellar atmosphere code for the purpose of computing non-LTE, line-blanketed, expanding atmospheric structures and detailed synthetic spectra...
Numerical simulations of surface convection in a late M-dwarf (2002)
Based on detailed 2D and 3D numerical radiation-hydrodynamics (RHD)simulations of time-dependent compressible convection, we have studiedthe dynamics and thermal structure of the convective surface...
Baraffe, O., Chabrier, G., Allard, F., Hauschildt, P. H.
We analyse pre-Main Sequence evolutionary tracks for low mass stars with masses m less than or equal to 1.4 M. based on the Baraffe et al. (1998) input physics. We also extend the recent Chabrier et...
Baraffe, I., Chabrier, Gilles, Allard, F., Hauschildt, P.H.
We analyse pre-Main Sequence evolutionary tracks for low mass stars with masses $m \\le 1.4 \\msol$ based on the Baraffe et al. (1998) input physics. We also extend the recent Chabrier et al. (2000)...
Baraffe, I., Chabrier, Gilles, Allard, F., Hauschildt, P.H.
We analyse pre-Main Sequence evolutionary tracks for low mass stars with masses $m \\le 1.4 \\msol$ based on the Baraffe et al. (1998) input physics. We also extend the recent Chabrier et al. (2000)...
Albrow, M., An, J., Caldwell, J. A. R., Dominik, M., Greenhill, J., ...
We present VLT FORS1 spectroscopy that temporally resolves the second caustic crossing of the Bulge K giant source of microlensing event EROS 2000-BLG-5, the first time this has been accomplished for...
Infrared Spectra and Spectral Energy Distributions of Late-M- and L-Dwarfs (2000)
Leggett, S. K., Allard, F., Geballe, T. R., Hauschildt, P. H., Schweitzer, A.
We have obtained 1.0-2.5um spectra at R~600 of 14 disk dwarfs with spectral types M6 to L7. For four of the dwarfs we have also obtained infrared spectra at R~3000 in narrow intervals. In addition,...
Non-LTE Modeling of Nova Cygni 1992 (2000)
Short, C. I., Hauschildt, P. H., Starrfield, S., Baron, E.
We present a grid of nova models that have an extremely large number of species treated in non-LTE, and apply it to the analysis of an extensive time series of ultraviolet spectroscopic data for Nova...
SN 1984A and Delayed Detonation Models of Type Ia Supernovae (2000)
Lentz, Eric J., Baron, E., Branch, David, Hauschildt, P. H.
SN 1984A shows unusually large expansion velocities in lines from freshly synthesized material, relative to typical Type Ia Supernovae (SNe Ia). SN 1984A is an example of a group of SNe Ia which have...
Spectral Energy Distributions for Disk and Halo M--Dwarfs (2000)
Leggett, S. K., Allard, F., Dahn, Conard, Hauschildt, P. H., Kerr, T. H., Rayner, J.
We have obtained infrared (1 to 2.5 micron) spectroscopy for 42 halo and disk dwarfs with spectral type M1 to M6.5. These data are compared to synthetic spectra generated by the latest model...
Evolution of low-mass stars and substellar objects. Contribution to the Galactic mass budget (1999)
Chabrier, G., Baraffe, I., Allard, F., Hauschildt, P. H.
We briefly summarize our present knowledge of the theory of low-mass stars and substellar objects and their contribution to the Galactic population.
On the abundance of Lithium in T Coronae Borealis (1999)
Shahbaz, T., Hauschildt, P. H., Naylor, T., Ringwald, F.
We have obtained high resolution echelle spectroscopy of the recurrent nova T CrB. We find that the surface lithium abundance in T CrB is signifcantly enhanced compared to field M giants, where it is...
Pistinner, S. L., Hauschildt, P. H., Eichler, D., Baron, E. A.
We calculate a grid of spherically symmetric OB stellar atmospheres at low metallicities, including both non-local thermodynamic equilibrium (NLTE) and metal line blanketing effects. This is done to...
Numerical Solution of the Expanding Stellar Atmosphere Problem (1998)
In this paper we discuss numerical methods and algorithms for the solution of NLTE stellar atmosphere problems involving expanding atmospheres, e.g., found in novae, supernovae and stellar winds. We...
Infrared Colors at the Stellar/Substellar Boundary (1998)
Leggett, S. K., Allard, F., Hauschildt, P. H.
We present new infrared photometry for 61 halo and disk stars around the stellar/substellar boundary. These data are combined with available optical photometry and astrometric data to produce...
A Spherical Non-LTE Line-Blanketed Stellar Atmosphere Model of the Early B Giant epsilon CMa (1998)
Aufdenberg, J. P., Hauschildt, P. H., Shore, S. N., Baron, E.
We use a spherical non-LTE fully line blanketed model atmosphere to fit the full multi-wavelength spectrum, including the extreme ultraviolet (EUV) continuum observed by the {\it Extreme Ultraviolet...
NLTE Effects in Modeling of Supernovae near Maximum Light (1996)
Baron, E., Hauschildt, P. H., Nugent, P., Branch, D.
Supernovae, with their diversity of compositions, velocities, envelope masses, and interactions are good testing grounds for probing the importance of NLTE in expanding atmospheres. In addition to...
NLTE Effects in Modeling of Supernovae near Maximum (1996)
E. Baron, P. H. Hauschildt, P. Nugent, D. Branch
Supernovae, with their diversity of compositions, velocities, envelope masses, and interactions are good testing grounds for probing the importance of NLTE in expanding
NLTE Modeling of SNe Ia Near Maximum Light (1995)
Baron, E., Hauschildt, P. H., Mezzacappa, A.
Modeling the atmospheres of SNe~Ia requires the solution of the NLTE radiative transfer equation. We discuss the formulation of the radiative transfer equation in the co-moving frame. For...
Preliminary Spectral Analysis of SN 1994I (1995)
Baron, E., Hauschildt, P. H., Branch, D., Kirshner, R. P., Filippenko, A. V.
We present optical spectra of the Type Ic supernova 1994I in M51 and preliminary non-LTE analysis of the spectra. Our models are not inconsistent with the explosions of C+O cores of massive stars....
Preliminary Spectral Analysis of SN 1994I (1995)
E. Baron, P. H. Hauschildt, D. Branch, R.P. Kirshner, A.V. Filippenko
We present optical spectra of the Type Ic supernova 1994I in M51 and preliminary non-LTE analysis of the spectra. Our models are not inconsistent with the explosions of C+O cores of massive stars....