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A Grid of MARCS Model Atmospheres for S Stars
Universite Libre de Bruxelles, Belgien.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
2011 (English)In: Astronomical Society of the Pacific, Conference Series, Volume 445, 2011, 71-75 p.Conference paper, Published paper (Refereed)
Abstract [en]

S-type stars are late-type giants whose atmosphere is enriched in carbon and s-process elements because of either extrinsic pollution by a binary companion or intrinsic nucleosynthesis and dredge-up on the thermally-pulsing AGB. A large grid of S-star model atmospheres has been computed covering the range 2700 < Teff < 4000 K with 0.5 < C/O < 0.99. ZrO and TiO band strength indices as well as VJHKL photometry are needed to disentangle Teff, C/O and [s/Fe]. A "best-model finding tool" was developed using a set of well-chosen indices and checked against photometry as well as low- and high-resolution spectroscopy. It is found that applying M-star model atmospheres (i.e., with a solar C/O ratio) to S stars can lead to errors on Teff up to 400K. We constrain the parameter space occupied by S stars of the vast sample of Henize stars in terms of Teff, [C/O] and [s/Fe].

Place, publisher, year, edition, pages
2011. 71-75 p.
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-169035OAI: oai:DiVA.org:uu-169035DiVA: diva2:504923
Conference
Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants
Available from: 2012-02-22 Created: 2012-02-22 Last updated: 2012-10-18

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Edvardsson, BengtEriksson, KjellGustafsson, Bengt

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