New Grids of ATLAS9 Model Atmospheres

Abstract

New opacity distribution functions (ODFs) for several metallicities have been computed. The main improvements upon previous ODFs computed by Kurucz (1990) are: (1) the replacement of the solar abundances from Anders & Grevesse (1989) with those from Grevesse & Sauval (1998); (2) the replacement of the TiO lines provided by Kurucz (1993) with the TiO lines from Schwenke (1998), as distributed by Kurucz (1999a); (3) the addition of the H2O lines from Partridge & Schwenke (1997) as distributed by Kurucz (1999b); (4) the addition of the HI-HI and HI-H+ quasi-molecular absorptions near 1600 A and 1400 A computed according to Allard et al. (1998). Other minor improvements are related with some changes in a few atomic and molecular data. New grids of ATLAS9 model atmospheres for Teff from 3500K to 50000K and logg from 0.0 dex to 5.0 dex have been computed for several metallicities with the new ODFs. Preliminary comparisons of the results from the old and new models have shown differences in the energy distributions of stars cooler than 4500K, in the ultraviolet energy distribution of metal-poor A-type stars, in the U-B and u-b color indices for Teff<7000K and in all the color indices for Teff<4250K.

Available as Poster A20 on the CD-ROM which is part of the Proceedings of the IAU Symp. No 210

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