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H-alpha Equivalent Width Variations across the Face of a Microlensed K Giant in the Galactic Bulge
M. Albrow, J. An, J. -P. Beaulieu +14
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 be…
Analysis of the Type IIn Supernova 1998S: Effects of Circumstellar Interaction on Observed Spectra
Eric J. Lentz, E. Baron, Peter Lundqvist +20
We present spectral analysis of early observations of the Type IIn supernova 1998S using the general non-local thermodynamic equilibrium atmosphere code \tt PHOENIX}. We model both…
Preliminary Spectral Analysis of the Type II Supernova 1999em
E. Baron, David Branch, Peter H. Hauschildt +19
We have calculated fast direct spectral model fits to two early-time spectra of the Type-II plateau SN 1999em, using the SYNOW synthetic spectrum code. The first is an extremely ea…
Infrared Spectra and Spectral Energy Distributions of Late-M- and L-Dwarfs
S. K. Leggett, F. Allard, T. R. Geballe +2
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 interv…
The use of the NEXTGEN model atmospheres for cool giants in a light curve synthesis code
Jerome A. Orosz, Peter H. Hauschildt
We have written a light curve synthesis code that makes direct use of model atmosphere specific intensities, in particular the NEXTGEN model atmosphere grid for cool giants (T_eff…
Non-LTE Modeling of Nova Cygni 1992
C. I. Short, P. H. Hauschildt, S. Starrfield +1
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 spectros…
TiO and HO absorption lines in cool stellar atmospheres
France Allard, Peter H. Hauschildt, David Schwenke
We compare the structures of model atmospheres and synthetic spectra calculated using different line lists for TiO and water vapor. We discuss the effects of different line list co…
Spherically symmetric model atmospheres for low mass pre-Main Sequence stars with effective temperatures between 2000 and 6800 K
France Allard, Peter H. Hauschildt, Andreas Schweitzer
We present a grid of spherically symmetric model atmospheres for young pre-MS stars. This grid spans the parameter range $2000\K \leq \Teff \leq 6800\K$ and $2.0 \leq \logg \leq 3.…
Pre-Main Sequence models for low-mass stars and brown dwarfs
I. Baraffe, G. Chabrier, F. Allard +1
We present evolutionary models for low mass stars and brown dwarfs ($m \le 1.2 \msol$) based on recent improvement of the theory: equation of state, atmosphere models, ... We conce…
SN 1984A and Delayed Detonation Models of Type Ia Supernovae
Eric J. Lentz, E. Baron, David Branch +1
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 o…
Non-LTE treatment of molecules in the photospheres of cool stars
Andreas Schweitzer, Peter H. Hauschildt, E. Baron
We present a technique to treat systems with very many levels, like molecules, in non-LTE. This method is based on a superlevel formalism coupled with rate operator splitting. Supe…
An Effective Temperature Scale for Late M and L Dwarfs, from Resonance Absorption Lines of CsI and RbI
Gibor Basri, Subhanjoy Mohanty, France Allard +5
We present Keck HIRES spectra of 6 late-M dwarfs and 11 L dwarfs. Our goal is to assign effective temperatures to the objects using detailed atmospheric models and fine analysis of…
Spectral Energy Distributions for Disk and Halo M--Dwarfs
S. K. Leggett, F. Allard, Conard Dahn +3
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 la…