New Grids of ATLAS9 Model Atmospheres
F. Castelli, R.L. Kurucz

TL;DR
This paper presents new grids of ATLAS9 stellar atmosphere models using updated opacity data, improving the accuracy of stellar spectra and colors across a wide range of temperatures and metallicities.
Contribution
The paper introduces updated ATLAS9 model atmospheres with new opacity distribution functions, incorporating recent atomic and molecular data for enhanced stellar modeling.
Findings
Differences in energy distributions for stars cooler than 4500K.
Altered ultraviolet spectra of metal-poor A-type stars.
Changes in color indices for stars with Teff<7000K.
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…
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Taxonomy
TopicsAtmospheric Ozone and Climate · Scientific Research and Discoveries · Stellar, planetary, and galactic studies
