Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..322k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 1, 1990, p. 322-327. Research supported by SERC.
Astronomy and Astrophysics
Astrophysics
16
B Stars, Early Stars, Solar Neighborhood, Stellar Composition, Stellar Spectra, Abundance, Spectrum Analysis, Stellar Atmospheres
Scientific paper
The coude spectrograph and CCD camera on the coude feed telescope at the Kitt Peak National Observatory, have been used to obtain high-resolution (0.09 A FWHM), high signal-to-noise (200) observations of weak A II absorption lines formed in the atmospheres of main-sequence early-type stars. These have been analyzed using LTE model atmosphere techniques to derive a mean argon-to-hydrogen abundance ratio of 6.49, which is believed to be accurate to + or - 0.1 dex. As the stellar atmospheres should be uncontaminated by the products of interior reactions, this abundance should be that of the interstellar medium from which the stars formed some 1-10 million yrs ago, and hence reflects the current chemical composition of the solar neighborhood. The result is compatible with that of Veck and Parkinson (1981).
Bates Brandon
Dufton Philip L.
Gilheany S.
Holmgren D. E.
Keenan Francis P.
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