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New ATLAS9 and MARCS Model Atmosphere Grids for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
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2012 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 144, no 4, 120- p.Article in journal (Refereed) Published
Abstract [en]

We present a new grid of model photospheres for the SDSS-III/APOGEE survey of stellar populations of the Galaxy, calculated using the ATLAS9 and MARCS codes. New opacity distribution functions were generated to calculate ATLAS9 model photospheres. MARCS models were calculated based on opacity sampling techniques. The metallicity ([M/H]) spans from -5 to 1.5 for ATLAS and -2.5 to 0.5 for MARCS models. There are three main differences with respect to previous ATLAS9 model grids: a new corrected H2O line list, a wide range of carbon ([C/M]) and alpha element [alpha/M] variations, and solar reference abundances from Asplund et al. The added range of varying carbon and alpha-element abundances also extends the previously calculated MARCS model grids. Altogether, 1980 chemical compositions were used for the ATLAS9 grid and 175 for the MARCS grid. Over 808,000 ATLAS9 models were computed spanning temperatures from 3500 K to 30,000 K and log g from 0 to 5, where larger temperatures only have high gravities. The MARCS models span from 3500 K to 5500 K, and log g from 0 to 5. All model atmospheres are publicly available online.

Place, publisher, year, edition, pages
2012. Vol. 144, no 4, 120- p.
Keyword [en]
astrochemistry, radiative transfer, stars: atmospheres, surveys
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-183211DOI: 10.1088/0004-6256/144/4/120ISI: 000308919300030OAI: oai:DiVA.org:uu-183211DiVA: diva2:562819
Available from: 2012-10-26 Created: 2012-10-23 Last updated: 2012-10-26Bibliographically approved

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Edvardsson, BengtGustafsson, Bengt
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