France Allard
C.R.A.L (UML 5574) Ecole Normale Superieure, 69364 Lyon Cedex 7, France
E-Mail: fallard@ens-lyon.fr

Peter H. Hauschildt
Dept. of Physics and Astronomy & Center for Simulational Physics, University of Georgia, Athens, GA 30602-2451
Email: yeti@hal.physast.uga.edu

Andreas Schweitzer
Dept. of Physics and Astronomy, University of Georgia, Athens, GA 30602-2451
Email: andy@hal.physast.uga.edu

Abstract:

We present a grid of spherically symmetric model atmospheres for young pre-MS stars. This grid spans the parameter range $2000\,{\rm K}\leq \hbox{$\,T_{\rm eff}$}\leq 6800\,{\rm K}$ and $2.0 \leq \log(g)\leq 3.5$ for $M=0.1\hbox{$\,$M$_\odot$}$, appropriate for low mass stars and brown dwarfs. A major improvement is the replacement of TiO and H₂O line lists with the newer line list calculated by the NASA-AMES group, for TiO (about 175 million lines of 5 isotopes) and for H₂O (about 350 million lines in 2 isotopes). We provide the model structures, spectra and broad-band colors in standard filters in electronic form.