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A grid of S stars MARCS model atmospheres
Université 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: Journal of Physics: Conference Series, Volume 328, 2011, 012009- p.Conference paper, Published paper (Refereed)
Abstract [en]

S stars are cool stars of temperatures similar to those of M giants, but their atmospheres are 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. Despite numerous attempts to link phenomenological spectral classification criteria to physical parameters (Teff, gravity, C/O, [s/Fe], [Fe/H]), the parameter space of S stars is poorly known and this has prevented accurate abundance analysis of S stars until now. Here we present a large grid of S-star model atmospheres. ZrO and TiO band strength indices as well as V J H KL photometry are needed to disentangle the ffective temperature, C/O and [s/Fe]. The stellar parameters derived on the basis of low-resolution spectra and photometry are shown to be fairly accurate when compared to high-resolution data of the same stars. The C/O ratio of S stars is found to be between the solar value (0.5) and 0.99, and not 1 as often claimed in the literature. Consistently with stellar evolution expectations, the C/O ratio increases as the ffective temperature decreases.

Place, publisher, year, edition, pages
2011. 012009- p.
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-169026DOI: 10.1088/1742-6596/328/1/012009OAI: oai:DiVA.org:uu-169026DiVA: diva2:504918
Conference
GREAT-ESF Workshop: Stellar Atmospheres in the Gaia Era
Available from: 2012-02-22 Created: 2012-02-22 Last updated: 2012-10-18

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Eriksson, KjellGustafsson, BengtEdvardsson, Bengt

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