A model atmosphere analysis of the F5 IV-V subgiant Procyon

Details A model atmosphere analysis of the F5 IV-V subgiant Procyon A model atmosphere analysis of the F5 IV-V subgiant Procyon

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26as...59..403s&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 59, March 1985, p. 403-427. Sponsorship: Deutsche Forschungs

Astronomy and Astrophysics

Astrophysics

142

Binary Stars, Stellar Atmospheres, Stellar Composition, Stellar Models, Stellar Spectra, Subgiant Stars, Abundance, Spectral Line Width, Stellar Mass, Stellar Temperature, White Dwarf Stars

Scientific paper

The spectrum of the main component of the Procyon system is analyzed on the basis of the high-quality Procyon Atlas (Griffin, 1979). Basic atmospheric parameters of this prominent object appear to be well-determined. The surface gravity is known with unusual accuracy, independent of spectroscopic analysis, and has the value log g = 4.0±0.1. Inconsistencies between this value and spectroscopic determinations of the surface gravity are investigated. It is shown that no simple model can convincingly explain these inconsistencies which are likely to occur in F type stars in general. Departures from LTE can account for at least part of the discrepancies. The author argues that fairly reliable abundances can be obtained using preferably weak lines and a model with a formal effective temperature of 6750K. Abundances of 28 elements are derived. The envelope of Procyon has essentially solar composition; substantial contamination with processed matter of the white dwarf progenitor can be excluded.

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