Bertelli, G., Nasi, E., Girardi, L., Marigo, P.
We extend our theoretical computations for low-mass stars to intermediate-mass and massive stars, for which few databases exist in the literature. Evolutionary tracks and isochrones are computed from...
Open clusters at nearly solar metallicity (2009)
Ch. Bonatto, E. Bica, L. Girardi
Theoretical isochrones compared to 2MASS observations:
Synthetic photometry for carbon rich giants, I. Hydrostatic dust-free models (2009)
Aringer, B., Girardi, L., Nowotny, W., Marigo, P., Lederer, M. T.
We study the spectroscopic and photometric properties of carbon stars. In the first paper of this series we focus on objects that can be described by hydrostatic models neglecting dynamical phenomena...
Planetary companion candidates around the K giant stars 42 Dra and HD 139357 (2009)
Doellinger, M. P., Hatzes, A. P., Pasquini, L., Guenther, E. W., Hartmann, M., Girardi, L.
For the past 3 years we have been monitoring 62 K giant stars using precise stellar radial velocity (RV) measurements with the 2m Alfred Jensch telescope of the Th\"uringer Landessternwarte...
Stellar populations in the Galactic bulge (2009)
Vanhollebeke, E., Groenewegen, M. A. T., Girardi, L.
AIMS:The aim of this paper is to study the characteristics of the stellar populations and the metallicity distribution in the Galactic bulge. We study the entire stellar population, but also retrieve...
Interstellar extinction and long-period variables in the Galactic centre (2009)
Schultheis, M., Sellgren, K., Ramírez, S., Stolovy, S., Ganesh, S., Glass, I. S., ...
Kerber, L., Girardi, L., Rubele, S.
The VISTA near infrared survey of the Magellanic System (VMC) will provide deep YJKs photometry reaching stars in the oldest turn-off point all over the Magellanic Clouds (MCs). As part of the...
Gogarten, SM, Dalcanton, JJ, Williams, BF, Seth, AC, Dolphin, A, Weisz, D, ...
We have obtained resolved stellar photometry from Hubble Space Telescope Advanced Camera for Surveys observations of a field in the outer disk of M81 as part of ANGST. Motivated by the recent...
The ACS Nearby Galaxy Survey Treasury. I. The Star Formation History of the M81 Outer Disk (2009)
Williams, BF, Dalcanton, JJ, Seth, AC, Weisz, D, Dolphin, A, Skillman, E, ...
The Advanced Camera for Surveys (ACS) Nearby Galaxy Survey Treasury is a large Hubble Space Telescope (HST)/ACS treasury program to obtain resolved stellar photometry for a volume-limited sample of...
Kerber, L.O., Girardi, L., Rubele, S., Cioni, M-R.L.
Original article can be found at: http://www.aanda.org/ Copyright The European Southern Observatory (ESO) DOI: 10.1051/0004-6361/200811118
Interstellar Extinction and Long-Period Variables in the Galactic Center (2008)
Schultheis, M., Sellgren, K., Ramirez, S., Stolovy, S., Ganesh, S., Glass, I. S., ...
We use the Spitzer IRAC catalogue of the Galactic Center (GC) point sources (Ramirez et al. 2008) and combine it with new isochrones (Marigo et al. 2008) to derive extinctions based on photometry of...
The evolved stars of Leo II dSph galaxy from near-infrared UKIRT/WFCAM observations (2008)
Gullieuszik, M., Held, E. V., Rizzi, L., Girardi, L., Marigo, P., Momany, Y.
We present a study of the evolved stellar populations in the dwarf spheroidal galaxy LeoII, based on JHKs observations obtained with the near-infrared array WFCAM at the UKIRT telescope. Combining...
Girardi, L., Dalcanton, J., Williams, B., De Jong, R., Gallart, C., Monelli, M., ...
We present extensive tables of bolometric corrections and interstellar extinction coefficients for the WFPC2 and ACS (both WFC and HRC) photometric systems. They are derived from synthetic photometry...
Bertelli, G., Girardi, L., Marigo, P., Nasi, E.
Tracks and isochrones have been computed in the range of initial masses 0.15 - 20 Mo for a grid of 39 chemical compositions with the metal content Z between 0.0001 and 0.070, and helium content Y...
Testing planet formation theories with Giant stars (2008)
Pasquini, Luca, Doellinger, M. P., Hatzes, A., Setiawan, J., Girardi, L., Da Silva, L., ...
Planet searches around evolved giant stars are bringing new insights to planet formation theories by virtue of the broader stellar mass range of the host stars compared to the solar-type stars that...
Planets around active stars (2008)
Setiwan, J., Weise, P., Henning, Th., Hatzes, A. P., Pasquini, L., Da Silva, L., ...
Si and Ca abundances of a selected sample of evolved stars (2008)
Da Silva, L., Girardi, L., Pasquini, L., De Medeiros, R., Setiawan, J., Döllinger, M., ...
Metallicity and age of selected G-K giants (2008)
Pasquini, Luca, Döllinger, M., Setiawan, J., Hatzes, A., Girardi, L., Da Silva, L., ...
Testing planet formation theories with giant stars (2008)
Pasquini, Luca, Döllinger, M. P., Hatzes, A., Setiawan, J., Girardi, L., Da Silva, L., ...
Si and Ca abundances of a selected sample of evolved stars (2008)
Silva, L. Da, Girardi, L., Pasquini, L., De Medeiros, R., Setiawan, J., Dölinger, M., ...
Not Available
Planets around active stars (2008)
Setiawan, J., Weise, P., Henning, Th, Hatzes, A. P., Pasquini, L., Silva, L. Da, ...
We present the results of radial velocity measurements of two samples of active stars. The first sample contains field G and K giants across the Red Giant Branch, whereas the second sample consists...
Testing planet formation theories with giant stars (2008)
Pasquini, Luca, Döllinger, M. P., Hatzes, A., Setiawan, J., Girardi, L., Da Silva, L., ...
Planet searches around evolved giant stars are bringing new insights to planet formation theories by virtue of the broader stellar mass range of the host stars compared to the solar-type stars that...
Planets around giant stars (2008)
Hatzes, A. P., Döllinger, M., Pasquini, L., Setiawan, J., Girardi, L., Da Silva, L.
Not Available
Physical parameters of evolved stars in clusters and in the field fromline-depth ratios (2008)
Biazzo, K., Pasquini, L., Frasca, A., Silva, L. Da, Girardi, L., Hatzes, A. P., ...
We present a high-resolution spectroscopic analysis of two samples of evolved stars selected in the field and in the intermediate-age open cluster IC 4651, for which detailed measurements of chemical...
Deltay Deltaz, Hipparcos Parallaxes, L. Portinari, P. A. Thejll, J. Macdonald, ...
. The primordial helium abundance YP is important for cosmology and the ratio \DeltaY =\DeltaZ of the changes relative to primordial abundances constrains models of stellar evolution. While the most...
Cioni, M. -R. L., Bekki, K., Clementini, G., Emerson, J. P., Evans, C. J., ...
The Magellanic System represents one of the best places to study the formation and evolution of galaxies. Photometric surveys of various depths, areas and wavelengths have had a significant impact on...
Evolved stars hint to an external origin of enhanced metallicity in planet-hosting stars (2007)
Pasquini, L., Doellinger, M. P., Weiss, A., Girardi, L., Chavero, C., Hatzes, A. P., ...
Exo-planets are preferentially found around high metallicity main sequence stars. We aim at investigating whether evolved stars share this property, and what this tells about planet formation....
Biazzo, K., Pasquini, L., Girardi, L., Frasca, A., Da Silva, L., Setiawan, J., ...
We test our capability of deriving stellar physical parameters of giant stars by analysing a sample of field stars and the well studied open cluster IC 4651 with different spectroscopic methods. The...
Planets around active stars (2007)
Setiawan, J., Weise, P., Henning, Th., Hatzes, A. P., Pasquini, L., Da Silva, L., ...
We present the results of radial velocity measurements of two samples of active stars. The first sample contains field G and K giants across the Red Giant Branch, whereas the second sample consists...
Physical parameters of evolved stars in clusters and in the field from line-depth ratios (2007)
Biazzo, K., Pasquini, L., Frasca, A., Da Silva, L., Girardi, L., Hatzes, A. P., ...
We present a high-resolution spectroscopic analysis of two samples of evolved stars selected in the field and in the intermediate-age open cluster IC 4651, for which detailed measurements of chemical...
Discovery of a planet around the K giant star 4 UMa (2007)
Doellinger, M. P., Hatzes, A. P., Pasquini, L., Guenther, E. W., Hartmann, M., Girardi, L., ...
Context: For the past 3 years we have been monitoring a sample of 62 K giant stars using precise stellar radial velocity measurements taken at the Thueringer Landessternwarte Tautenburg. Aims: To...
Costa, M, Casaretti, R, Tuccillo, M, Girardi, L, Chiarandini, P, Rocca, G Della
No abstract available.
On the effect of helium enhancement on bolometric corrections and Teff-colour relations (2007)
Girardi, L., Castelli, F., Bertelli, G., Nasi, E.
We evaluate the effects that variations in He content have on bolometric corrections and Teff-colour relations. To this aim, we compute ATLAS9 model atmospheres and spectral energy distributions for...
Discovery of a planet around the K giant star 4 Ursae Majoris (2007)
Döllinger, M. P., Hatzes, A. P., Pasquini, L., Guenther, E. W., Hartmann, M., Girardi, L., ...
Evolved stars suggest an external origin of the enhanced metallicity in planet-hosting stars (2007)
Pasquini, L., Döllinger, M. P., Weiss, A., Girardi, L., Chavero, C., Hatzes, A. P., ...
Evolved stars suggest an external origin of the enhanced metallicity in planet-hosting stars (2007)
Pasquini, L., Döllinger, M. P., Weiss, A., Girardi, L., Chavero, C., Hatzes, A. P., ...
Aims. Exo-planets are preferentially found around high metallicity main sequence stars. We investigate whether evolved stars share this property, and its implications for planet formation. Methods:...
Biazzo, K., Pasquini, L., Girardi, L., Frasca, A., Da Silva, L., Setiawan, J., ...
Aims.We test our capability of deriving stellar physical parameters of giant stars by analysing a sample of field stars and the well studied open cluster IC 4651 with different spectroscopic methods....
Basic physical parameters of a selected sample of evolved stars (2006)
Da Silva, L., Girardi, L., Pasquini, L., Setiawan, J., De Medeiros, J. R., ...
We present the detailed spectroscopic analysis of 72 evolved stars, including the [Fe/H] determination for the whole sample. These metallicities, together with the Teff values and the absolute V...
The red giant clump has been recently argued to be a reliable distance indicator for the galaxies in the Local Group. The accuracy of distance determinations based on this method, however, depends on...
AGB stars in the Magellanic Clouds. III. The rate of star formation across the SMC (2006)
Cioni, M. -R. L., Girardi, L., Marigo, P., Habing, H. J.
This article compares the Ks magnitude distribution of Small Magellanic Cloud asymptotic giant branch stars obtained from the DENIS and 2MASS data with theoretical distributions. Theoretical Ks...
Radial velocity variations of G and K giants (2006)
Döllinger, M. P., Pasquini, L., Hatzes, A., Weiss, A., Setiawan, J., Da Silva, L., ...
Basic physical parameters of a selected sample of evolved stars (2006)
Da Silva, L., Girardi, L., Pasquini, L., Setiawan, J., De Medeiros, J. R., ...
Radial velocity variations of G and K giants (2006)
Döellinger, M. P., Pasquini, L., Hatzes, A., Weiss, A., Setiawan, J., Da Silva, L., ...
G and K giants are a new class of radial velocity (RV) variables. In order to reveal the reasons of this variability we started in February 2004 a program to observe a northern sample of 62 K giants...
Basic physical parameters of a selected sample of evolved stars (2006)
Da Silva, L., Girardi, L., Pasquini, L., Setiawan, J., De Medeiros, J. R., ...
We present the detailed spectroscopic analysis of 72 evolved stars, which were previously studied for accurate radial velocity variations. Using one Hyades giant and another well studied star as the...
Asteroseismology of K Giants (2006)
Di Mauro, M. P., Cardini, D., D'Antona, F., Weiss, A., Döllinger, M. P., Pasquini, L., ...
AGB stars in the Magellanic Clouds II. The rate of star formation across the LMC. (2006)
Cioni, M-R.L., Girardi, L., Marigo, P., Habing, H.J.
Original article can be found at: http://www.aanda.org/ Copyright The European Southern Observatory (ESO) DOI: 10.1051/0004-6361:20053933
Cioni, M-R.L., Girardi, L., Marigo, P., Habing, H.J.
Original article can be found at: http://www.aanda.org/ Copyright The European Southern Observatory (ESO) DOI: 10.1051/0004-6361:20054699
AGB stars in the Magellanic Clouds. II. The rate of star formation across the LMC (2005)
Cioni, M. -R. L., Girardi, L., Marigo, P., Habing, H. J.
This article compares the distribution of Ks magnitude of Large Magellanic Cloud (LMC) asymptotic giant branch (AGB) stars obtained from the DENIS and 2MASS data with theoretical distributions. These...
A substellar companion around the intermediate-mass giant star HD 11977 (2005)
Setiawan, J., Rodmann, J., Da Silva, L., Hatzes, A. P., Pasquini, L., ...
We report the discovery of a substellar companion to the intermediate-mass star HD 11977 (G5 III). Radial velocities of this star have been monitored for five years with FEROS at the 1.52-m ESO and...
Girardi, L., Groenewegen, M. A. T., Hatziminaoglou, E., Da Costa, L.
We describe TRILEGAL, a new populations synthesis code for simulating the stellar photometry of any Galaxy field. The code attempts to improve upon several technical aspects of star count models, by:...
Atmospheric parameters of a sample of giant stars with accurate radial velocity variations (2005)
Da Silva, L., Girardi, L., Pasquini, L., Döllinger, M., De Medeiros, R., Setiawan, J., ...
A substellar companion around the intermediate-mass giant star HD 11977 (2005)
Setiawan, J., Rodmann, J., Da Silva, L., Hatzes, A. P., Pasquini, L., ...
We report the discovery of a substellar companion to the intermediate-mass star HD 11977 (G5 III). Radial velocities of this star have been monitored for five years with FEROS at the 1.52-m ESO and...
Evolution of planetary nebulae II. Population effects on the bright cut-off of the PNLF (2004)
Marigo, P., Girardi, L., Weiss, A., Groenewegen, M. A. T., Chiosi, C.
We investigate the bright cut-off of the [OIII]l5007 planetary nebula luminosity function (PNLF), that has been suggested as a powerful extragalactic distance indicator. Theoretical PNLFs are...
Girardi, L., Grebel, E. K., Odenkirchen, M., Chiosi, C.
Following Paper I, we provide extended tables of bolometric corrections, extinction coefficients, stellar isochrones, and integrated magnitudes and colours of single-burst stellar populations, for...
Evolution of planetary nebulae II. Population effects on the bright cut-off of the PNLF (2004)
Marigo, P., Girardi, L., Weiss, A., Groenewegen, M. A. T., Chiosi, C.
Setiawan, J., Pasquini, L., Da Silva, L., Hatzes, A. P., Girardi, L., ...
We present the results of our radial velocity (RV) measurements of G and K giants, concentrating on the presence of multiple systems in our sample. Eighty-three giants have been observed for 2.5...
Girardi, L., Grebel, E. K., Odenkirchen, M., Chiosi, C.
Following Paper I, we provide extended tables of bolometric corrections, extinction coefficients, stellar isochrones, and integrated magnitudes and colours of single-burst stellar populations, for...
Binaries from FEROS radial velocity survey (2004)
Setiawan, J., Da Silva, L., Pasquini, L., Hatzes, A. P., Girardi, L., ...
The red tail of carbon stars in the LMC: Models meet 2MASS and DENIS observations (2003)
Marigo, P., Girardi, L., Chiosi, C.
Carbon stars are known to exhibit systematically redder near-infrared colours with respect to M-type stars. In the near-infrared colour-magnitude diagrams provided by the 2MASS and DENIS surveys, the...
Constraining the third dredge-up via carbon stars in the Magellanic Clouds (2003)
We use the available data for Magellanic Cloud carbon stars to constrain the efficiency of the third dredge-up process in TP-AGB models. We show that star counts in LMC clusters provide quite...
Evidence of a sub-stellar companion around HD 47536 (2003)
Setiawan, J., Hatzes, A. P., Pasquini, L., Naef, D., Da Silva, L., ...
We report evidence of a low-mass companion around the K1III giant star HD 47536. This star belongs to our sample of 83 subgiant and giant stars studied for their radial velocity variations using the...
Bertelli, G., Nasi, E., Girardi, L., Chiosi, C., Zoccali, M., Gallart, C.
The color-magnitude diagrams (CMDs) of three intermediate-age LMC clusters, NGC 2173, SL556 and NGC2155 are analyzed to determine their age and metallicity basing on Padova stellar models. Synthetic...
Evolution of zero-metallicity massive stars (2002)
Marigo, P., Chiosi, C., Girardi, L.
We discuss the evolutionary properties of primordial massive and very massive stars, supposed to have formed from metal-free gas. Stellar models are presented over a large range of initial masses (8...
Gallart, C., Zoccali, M., Bertelli, G., Chiosi, C., Demarque, P., Girardi, L., ...
This is the first of a series of three papers devoted to the calibration of a few parameters of crucial importance in the modeling of the evolution of intermediate-mass stars, with special attention...
ESO Imaging Survey. The Stellar Catalogue in the Chandra Deep Field South (2002)
Groenewegen, M. A. T., Girardi, L., Hatziminaoglou, E., Benoist, C., Olsen, L. F., Da Costa, L., ...
(abridged) Stellar catalogues in five passbands (UBVRI) over an area of approximately 0.3 deg^2, comprising about 1200 objects, and in seven passbands (UBVRIJK) over approximately 0.1 deg^2,...
Girardi, L., Bertelli, G., Bressan, A., Chiosi, C., Groenewegen, M. A. T., Marigo, P., ...
We provide tables of theoretical isochrones in several photometric systems. To this aim, the following steps are followed: (1) First, we re-write the formalism for converting synthetic stellar...
Girardi, L., Bertelli, G., Bressan, A., Chiosi, C., Groenewegen, M. A. T., Marigo, P., ...
We provide tables of theoretical isochrones in several photometric systems. To this aim, the following steps are followed: (1) first, we re-write the formalism for converting synthetic stellar...
Broad-band photometric evolution of star clusters (2002)
I briefly introduce a database of models that describe the evolution of star clusters in several broad-band photometric systems. Models are based on the latest Padova stellar evolutionary tracks -...
L. Girardi, G. Bertelli, A. Bressan, C. Chiosi, P. Marigo, ...
Abstract. We provide tables of theoretical isochrones in several photometric systems. To this aim, the following steps are followed: (1) first, we re-write the formalism for converting synthetic...
Evolution of Planetary Nebulae I. An improved synthetic model (2001)
Marigo, P., Girardi, L., Groenewegen, M. A. T., Weiss, A.
We present a new synthetic model to follow the evolution of a planetary nebula (PN) and its central star, starting from the onset of AGB phase up to the white dwarf cooling sequence. The model...
Dwarf Elliptical Galaxies: Structure, Star Formation, and Color-Magnitude Diagrams (2001)
Carraro, G., Chiosi, C., Girardi, L., Lia, C.
The aim of this paper is to cast light on the formation and evolution of elliptical galaxies by means of N-body/hydro-dynamical simulations that include star formation, feed-back and chemical...
P. Marigo, L. Girardi, A. Weiss
Abstract. We present a new synthetic model to follow the evolution of a planetary nebula (PN) and its central star, starting from the onset of AGB phase up to the white dwarf cooling sequence. The...
Ca II activity and rotation in F-K evolved stars (2000)
Pasquini, L., De Medeiros, J. R., Girardi, L.
(Abridged) Ca II H and K high resolution observations for 60 evolved stars in the field and in 5 open clusters are presented. From these spectra chromospheric fluxes are derived, and a homogeneous...
On the peculiar red clump morphology in the open clusters NGC 752 and NGC 7789 (2000)
The red clump stars in the open cluster NGC 752 present a peculiar distribution in the colour-magnitude diagran (CMD): the clump is observed to present a faint extension, slightly to the blue of the...
The puzzling theoretical predictions for the luminosity of clumping He burning stars (1999)
Castellani, V., Degl'Innocenti, S., Girardi, L., Marconi, M., Moroni, P. G. Prada, Weiss, A.
This paper deals with theoretical predictions for He burning models in a range of masses covering the so-called Red Giant Branch phase transition. Taking as a guideline the observational constraints...
Is the core mass-luminosity relation violated by the occurrence of the third dredge-up ? (1999)
Marigo, P., Girardi, L., Weiss, A., Groenewegen, M. A. T
The core mass-luminosity (Mc-L) relation of TP-AGB stars is a key ingredient in synthetic calculations of their evolution. Recently, Herwig et al. (1998) have presented full calculations of TP-AGB...
Girardi, L., Groenewegen, M. A. T., Weiss, A., Salaris, M.
The I-band brightness of clump stars has been used recently to determine the distance to the bulge, the LMC and SMC, and to M31. It was assumed to be a standard candle based on the observational fact...