An elemental abundance analysis of the superficially normal A star Vega

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 superficia...

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Veröffentlicht in:	The Astrophysical journal 1990, Vol.348 (2), p.712-717
Hauptverfasser:	Adelman, Saul J., Gulliver, Austin F.
Format:	Artikel
Sprache:	eng
Schlagworte:	640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources ABUNDANCE Astronomy Astrophysics ATMOSPHERES CHEMICAL COMPOSITION CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS DIFFUSION Earth, ocean, space ELEMENT ABUNDANCE ELEMENTS Exact sciences and technology FLUIDS GASES HELIUM HYDROGEN Luminosities, magnitudes, effective temperatures, color, and spectral classification NONMETALS PHOTOMETRY RARE GASES SPECTRA STARS STELLAR ATMOSPHERES Stellar characteristics and properties
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Zusammenfassung:	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.
ISSN:	0004-637X 1538-4357
DOI:	10.1086/168279