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Title:
An elemental abundance analysis of the superficially normal A star VEGA
Authors:
Adelman, Saul J.; Gulliver, Austin F.
Affiliation:
AA(The Citadel, Charleston, SC), AB(Brandon University, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 10, 1990, p. 712-717. Research supported by the Citadel Development Foundation and NSERC. (ApJ Homepage)
Publication Date:
01/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
A Stars, Metallicity, Spectrum Analysis, Stellar Composition, Stellar Spectra, Astronomical Photometry, Early Stars, Helium, Peculiar Stars
DOI:
10.1086/168279
Bibliographic Code:
1990ApJ...348..712A

Abstract

An elemental abundance analysis of Vega has been performed using high-signal-to-noise 2.4 A/mm Reticon observations of the region 4313-4809 A. Vega is found to be a metal-poor star with a mean underabundance of 0.60 dex. The He/H ratio of 0.03 as derived from He I 4472 A suggests that the superficial helium convection zone has disappeared and that radiative diffusion is producing the photospheric abundance anomalies.

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