Application of the Disk Evaporation Model to AGNs (2009)
The disk corona evaporation model extensively developed for the interpretation of observational features of black hole X-ray binaries (BHXRBs) is applied to AGNs. Since the evaporation of gas in the...
Probing the Pulsar Wind in the gamma-ray Binary System PSR B1259-63/SS 2883 (2009)
Takata, Jumpei, Taam, Ronald E.
The spectral energy distribution from the X-ray to the very high energy regime ($>100$ GeV) has been investigated for the $\gamma$-ray binary system PSR B1259-63/SS2883 as a function of orbital phase...
Diffuse X-ray emission in globular cluster cores (2009)
Hui, C. Y., Cheng, K. S., Taam, Ronald E.
The unresolved X-ray emission in the cores of 10 globular clusters hosting millisecond pulsars is investigated. Subtraction of the known resolved point sources leads to detectable levels of...
Common Envelope Mergers: A Possible Channel for Forming Single sdB Stars (2008)
Politano, Michael, Taam, Ronald E., Van Der Sluys, Marc, Willems, Bart
We quantify an evolutionary channel for single sdB stars based on mergers of binaries containing a red giant star and a lower mass main sequence or brown dwarf companion in our Galaxy. Population...
On the Properties of Inner Cool Disks in the Hard State of Black Hole X-Ray Transient Systems (2008)
Taam, Ronald E., Liu, B. F., Meyer, F., Meyer-Hofmeister, E.
The formation of a cool disk in the innermost regions of black hole X-ray transient systems in the low hard state is investigated. Taking into account the combined cooling associated with the Compton...
Compact object modeling with the StarTrack population synthesis code (2008)
Belczynski, Krzysztof, Kalogera, Vassiliki, Rasio, Frederic A., Taam, Ronald E., Zezas, Andreas, Bulik, Tomasz, ...
We present a comprehensive description of the population synthesis code StarTrack. The original code has been significantly modified and updated. Special emphasis is placed here on processes leading...
The existence of inner cool disks in the low hard state of accreting black holes (2008)
Liu, B. F., Taam, Ronald E., Meyer, F., Meyer-Hofmeister, E.
On the properties of inner cool disks in the hard state of black hole X-ray transient systems (2008)
Taam, Ronald E., Liu, B. F., Meyer, F., Meyer-Hofmeister, E.
The Interaction of Stellar Objects within a Common Envelope (2007)
Ricker, Paul M., Taam, Ronald E.
We use high-resolution, three-dimensional hydrodynamic simulations to study the hydrodynamic and gravitational interaction between stellar companions embedded within a differentially rotating common...
The Existence of Inner Cool Disks in the Low Hard State of Accreting Black Holes (2007)
Liu, B. F., Taam, Ronald E., Meyer-Hofmeister, E., Meyer, F.
The condensation of matter from a corona to a cool, optically thick inner disk is investigated for black hole X-ray transient systems in the low hard state. A description of a simple model for the...
The Thermal Evolution of the Donors in AM CVn Binaries (2007)
Deloye, Christopher J., Taam, Ronald E., Winisdoerffer, Christopher, Chabrier, Gilles
(Abridged) We calculate the full stellar-structural evolution of donors in AM CVn systems formed through the WD channel coupled to the binary's evolution. Contrary to assumptions made in prior...
Belczynski, Krzysztof, Taam, Ronald E., Rantsiou, Emmanouela, Van Der Sluys, Marc
The evolution of the spin and tilt of black holes in compact black hole - neutron star and black hole - black hole binary systems is investigated within the framework of the coalescing compact star...
The existence of inner cool disks in the low/hard state of accreting black holes (2007)
Liu, B. F., Taam, Ronald E., Meyer-Hofmeister, E., Meyer, F.
On the rarity of double black hole binaries: consequences for gravitational-wave detection (2006)
Belczynski, Krzysztof, Taam, Ronald E., Kalogera, Vassiliki, Rasio, Frederic A., Bulik, Tomasz
Double black hole binaries are among the most important sources of gravitational radiation for ground-based detectors such as LIGO or VIRGO. Even if formed with lower efficiency than double neutron...
Thermal Evolution of AM CVn Binary Donors (2006)
Deloye, Christopher J., Taam, Ronald E., Winisdoerffer, Christophe, Chabrier, Gilles
We discuss results of our study on AM CVn binaries formed with donors that never ignited He before contact. For the first time, we treat the donor's in these systems in the context of a full stellar...
Deloye, Christopher J., Taam, Ronald E.
We report on evolutionary calculations of the onset of mass transfer in AM CVn binaries, treating the donor's evolution in detail. We show that during the early contact phase, while the mass transfer...
Low Mach number modeling of Type I X-ray burst deflagrations (2006)
Lin, David J., Bayliss, Alvin, Taam, Ronald E.
The Low Mach Number Approximation (LMNA) is applied to 2D hydrodynamical modeling of Type I X-ray bursts on a rectangular patch on the surface of a non-rotating neutron star. Because such phenomena...
Pulsar Wind Nebulae and the Non-thermal X-Ray Emission of Millisecond Pulsars (2006)
Cheng, K. S., Taam, Ronald E., Wang, W.
The non-thermal, non-pulsed X-ray emission of MSPs is investigated. As in young pulsars, MSPs emit a relativistic wind, which interacting with the interstellar medium and/or a binary companion can...
A multiwavelength study of the pulsar PSR B1929+10 and its X-ray trail (2006)
Becker, Werner, Kramer, Michael, Jessner, Axel, Taam, Ronald E., Jia, Jian J., Cheng, Kwong S., ...
Hot One-Temperature Accretion Flows Revisited (2005)
Yuan, Feng, Taam, Ronald E., Xue, Yongquan, Cui, Wei
The effectiveness of the thermal coupling of ions and electrons in the context of optically thin, hot accretion flows is investigated. In the limit of complete coupling, we focus on the...
A Multi-wavelength study of the Pulsar PSR B1929+10 and its X-ray trail (2005)
Becker, Werner, Kramer, Michael, Jessner, Axel, Taam, Ronald E., Jia, Jian J., Cheng, Kwong S., ...
We report on the emission properties of PSR B1929+10 and its putative X-ray trail from a multi-wavelength study performed with XMM-Newton, the ESO NTT, the HST, the Effelsberg 100m Radio Telescope...
Willems, Bart, Kolb, Ulrich, Sandquist, Eric L., Taam, Ronald E., Dubus, Guillaume
The population synthesis of cataclysmic variable binary systems at short orbital periods (
Pulsar Wind Nebulae and the X-Ray Emission of Non-Accreting Neutron Stars (2004)
Cheng, K. S., Taam, Ronald E., Wang, W.
The general properties of the non-thermal non-pulsed X-ray emission of rotation powered pulsars are investigated in the context of a pulsar wind nebula model. An examination of the observed X-ray...
The formation and evolution of compact stars in binaries (2004)
Se describen los procesos evolutivos estelares responsables de la formación de objetos compactos en sistemas binarios en interacción y su evolución. La fase de envolvente común juega un papel...
On the Chandra X-ray Sources in the Galactic Center (2003)
Belczynski, Krzysztof, Taam, Ronald E.
Recent deep Chandra surveys of the Galactic center region have revealed the existence of a faint, hard X-ray source population. While the nature of this population is unknown, it is likely that...
Thermal Timescale Mass Transfer and the Evolution of White Dwarf Binaries (2003)
Ivanova, Natalia, Taam, Ronald E.
The evolution of binaries consisting of evolved main sequence stars (1 < M_d/Msun < 3.5) with white dwarf companions (0.7 < M_wd/Msun < 1.2) is investigated through the thermal mass transfer phase....
Magnetic Braking Revisited (2003)
Ivanova, Natalia, Taam, Ronald E.
We present a description for the angular momentum loss rate due to magnetic braking for late type stars taking into account recent observational data on the relationship between stellar activity and...
On the Origin of X-ray Emission From Millisecond Pulsars in 47 Tuc (2003)
The observed spectra and X-ray luminosities of millisecond pulsars in 47 Tuc can be interpreted in the context of theoretical models based on strong, small scale multipole fields on the neutron star...
Galactic Populations of Ultracompact Binaries (2003)
Belczynski, Krzysztof, Taam, Ronald E.
Recent RXTE and Chandra discoveries of low mass X-ray binaries with ultra-short orbital periods have initiated theoretical work on the origins of these peculiar systems. Using the StarTrack...
Wolf-Rayet Central Stars and the Binary Evolution Channel (2002)
De Marco , Orsola, Herwig , Falk, Mac Low, Mordecai Mark, Sandquist , Eric L., Taam , Ronald E.
Single star evolutionary calculations have recently succeeded in reproducing the composition of the hydrogen deficient Wolf-Rayet (WR) central stars of planetary nebula (PN). However, the latest...
The Influence of Hydrodynamical Winds on Hot Accretion Disk Solutions (2001)
Misra, Ranjeev, Taam, Ronald E.
The effect of a possible hydrodynamical wind on the nature of hot accretion disk solutions is studied. It is found that the advection dominated branch, in the presence of a wind, maintains the...
Hydrodynamical winds from two-temperature plasma in X-ray binaries (2000)
Lin, David J., Misra, R., Taam, Ronald E.
Hydrodynamical winds from a spherical two-temperature plasma surrounding a compact object are constructed. The mass-loss rate is computed as a function of electron temperature, optical depth and...
Circumbinary disks and cataclysmic variable evolution (2000)
Spruit, H. C., Taam, Ronald E.
The influence of a circumbinary (CB) disk on the evolution of cataclysmic variable (CV) binary systems is investigated. We show that CB mass surface densities sufficient to influence the evolution...
On a Theoretical Interpretation of the Period Gap in Binary Millisecond Pulsars (2000)
Taam, Ronald E., King, Andrew R., Ritter, Hans
We reexamine evolutionary channels for the formation of binary millisecond pulsars in order to understand their observed orbital period distribution. The available paths provide a natural division...
The Evolutionary Status of SS433 (1999)
King, Andrew R., Taam, Ronald E., Begelman, Mitchell C.
We consider possible evolutionary models for SS 433. We assume that common-envelope evolution is avoided if radiation pressure is able to expel most of a super-Eddington accretion flow from a region...
On the Formation of Helium Double Degenerate Stars and Pre-Cataclysmic Variables (1999)
Sandquist, Eric L., Taam, Ronald E., Burkert, Andreas
The evolution of low mass (M < 2.5 Msun) binaries through the common envelope phase has been studied for systems in which one member is on its first ascent of the red giant branch. Three-dimensional...
Variable-Frequency QPOs from the Galactic Microquasar GRS 1915+105 (1999)
Markwardt, Craig B., Swank, Jean H., Taam, Ronald E.
We show that the galactic microquasar GRS 1915+105 exhibits quasi-periodic oscillations (QPOs) whose frequency varies continuously from 1-15 Hz, during spectrally hard dips when the source is in a...
Planet Consumption and Stellar Metallicity Enhancements (1998)
Sandquist, Eric, Taam, Ronald E., Lin, D. N. C., Burkert, Andreas
The evolution of a giant planet within the stellar envelope of a main-sequence star is investigated as a possible mechanism for enhancing the stellar metallicities of the parent stars of extrasolar...
Double Core Evolution X. Through the Envelope Ejection Phase (1998)
Sandquist, Eric L., Taam, Ronald E., Chen, Xingming, Bodenheimer, Peter, Burkert, Andreas
The evolution of binary systems consisting of an asymptotic giant branch star of mass equal to 3 M_sun or 5 M_sun, and a main sequence star of mass equal to 0.4 M_sun or 0.6 M_sun with orbital...
Rapid Bursts From GRS 1915+105 with RXTE (1997)
Taam, Ronald E., Chen, Xingming, Swank, Jean H.
The light curves of GRS 1915+105 observed with RXTE on October 15, 1996 reveal a wide range of transient activity including regular bursts with a recurrence time of about 1 minute, irregular bursts,...
On the morphology of accretion flows with small non-zero specific angular momentum (1996)
Chen, Xingming, Taam, Ronald E., Abramowicz, Marek A., Igumenshchev, Igor V.
The morphology of adiabatic accretion flows with small non-zero specific angular momentum has been investigated in the axisymmetric and nonviscous limit. For an initial state characterized by a Bondi...
The Pattern of Correlated X-ray Timing and Spectral Behavior in GRS 1915+105 (1996)
Chen, Xingming, Swank, Jean H., Taam, Ronald E.
From data obtained from the PCA in the 2-11 keV and 11-30.5 keV energy range, GRS 1915+105 is seen during RXTE observations between 1996 May and October on two separate branches in a hardness...
Double-Diffusive Mixing-Length Theory, Semiconvection, and Massive Star Evolution (1996)
Grossman, Scott A., Taam, Ronald E.
Double-diffusive convection refers to mixing where the effects of thermal and composition gradients compete to determine the stability of a fluid. In addition to the familiar fast convective...
The Spectral States of Black Hole X-ray Binary Sources (1996)
Chen, Xingming, Taam, Ronald E.
A framework for the interpretation of the spectral states of black hole X-ray transients based on the diversity of accretion disk models is introduced. Depending on the mass accretion rate, it is...
Abramowicz, Marek A., Chen, Xingming, Taam, Ronald E.
The global nonlinear time dependent evolution of accretion disk-corona systems in X-ray binary sources has been investigated to provide an understanding of the low frequency ($\sim 0.04$~Hz)...
Chen, Xingming, Taam, Ronald E.
The global nonlinear time-dependent evolution of the inertial-acoustic mode instability in accretion disks surrounding black holes has been investigated. The viscous stress is assumed to be...
Chen, Xingming, Taam, Ronald E.
We consider the inner regions of accretion disks surrounding black holes and neutron stars and investigate the nonlinear time dependent evolution of thermal-viscous instabilities. The viscous stress...