SAtlas: Spherical Versions of the Atlas Stellar Atmosphere Program

Details SAtlas: Spherical Versions of the Atlas Stellar Atmosphere Program SAtlas: Spherical Versions of the Atlas Stellar Atmosphere Program

2008-09-10

arxiv.org/abs/0809.1870v1

Astronomy and Astrophysics

Astrophysics

10 pages, 10 figures, Accepted for publication in A&A

Scientific paper

10.1051/0004-6361:200810578

Context: The current stellar atmosphere programs still cannot match some fundamental observations of the brightest stars, and with new techniques, such as optical interferometry, providing new data for these stars, additional development of stellar atmosphere codes is required. Aims: To modify the open-source model atmosphere program Atlas to treat spherical geometry, creating a test-bed stellar atmosphere code for stars with extended atmospheres. Methods: The plane-parallel Atlas has been changed by introducing the necessary spherical modifications in the pressure structure, in the radiative transfer and in the temperature correction. Results: Several test models show that the spherical program matches the plane-parallel models in the high surface gravity regime, and matches spherical models computed by Phoenix and by MARCS in the low gravity case.

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