The Atmospheric Parameters of A-Stars and F-Stars - Part One - Comparison of Various Methods

Details The Atmospheric Parameters of A-Stars and F-Stars - Part One - Comparison of Various Methods The Atmospheric Parameters of A-Stars and F-Stars - Part One - Comparison of Various Methods

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...271..515s&link_type=abstract

Astronomy and Astrophysics, Vol.271, NO. 2/APR, P. 515, 1993

Astronomy and Astrophysics

Astrophysics

36

Stars: Fundamental Parameters, Stars: Chemically Peculiar, Techniques: Photometric, Line: Profiles

Scientific paper

We present a detailed investigation into the methods of determining the atmospheric parameters of stars in the spectral range A3 - F5, including metallic-lined (Am) stars. The systematic differences in effective temperature (Teff) and surface gravity (log g) obtained by Lane & Lester (1984) and Dworetsky & Moon (1986) for Am stars are evaluated. A flux excess at 4785 Å proposed by Lester (1987) as the reason for uvbyβ photometry giving higher Teff and log g values than spectrophotometry is investigated. Spectroscopic observations of this region show no sign of any excess. We find that the flux excess is caused by a depression in older model fluxes caused by an excess of C I opacity. Medium-resolution spectra of Hβ and Hγ line profiles are used to obtain the Teff for 52 A and F stars. The results are in agreement with those from uvbyβ photometry. Spectrophotometric Teff and log g given by Lane & Lester are shown to be too low, due to insufficient allowance for metal abundance ([M/H]). Using an appropriate [M/H] gives Teff and log g in good agreement with those given by uvbyβ and Balmer lines.

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