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On Stellar Models with Blanketed Atmospheres as Boundary Conditions
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Theoretical Astrophysics. (Teoretisk astrofysik)
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Theoretical Astrophysics. (Teoretisk astrofysik)
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Theoretical Astrophysics. (Teoretisk astrofysik)
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2007 (English)In: Stellar Populations as Building Blocks of Galaxies: Proceedings of IAU Symposium #241, 2007, 23-27 p.Conference paper, Published paper (Other scientific)
Abstract [en]

The impact on the predicted Teff scale of using the latest MARCS model atmospheres, instead of a fixed atmospheric structure (e.g., the gray T–τ relation) is examined. The former were fitted to stellar interior models at both the photosphere and at τ = 100 to determine the sensitivity of evolutionary tracks and isochrones for [Fe/H] = 0.0 and −2.0 to the chosen fitting point. In the case of solar abundances, the Teff of the giant branch varied by up to 100–150 K, depending on how the outer layers were treated. Much smaller variations were found for metal-poor giants (or main-sequence stars). Interestingly, models for the low solar Z favored by Asplund et al. (Z=0.0125) were unable to reproduce the gap near the turnoff in the C-M diagram of the old open cluster M 67, in contrast to models that assume Z=0.0188.

Place, publisher, year, edition, pages
2007. 23-27 p.
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-13569DOI: doi:10.1017/S1743921307007351OAI: oai:DiVA.org:uu-13569DiVA: diva2:41339
Available from: 2008-01-23 Created: 2008-01-23

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Edvardsson, BengtEriksson, KjellGustafsson, Bengt

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