An Elemental Abundance Analysis of the Superficially Normal A Star VEGA (original) (raw)

NASA/ADS

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.

Publication:

The Astrophysical Journal

Pub Date:

January 1990

DOI:

10.1086/168279

Bibcode:

1990ApJ...348..712A

Keywords:

• A Stars;
• Metallicity;
• Spectrum Analysis;
• Stellar Composition;
• Stellar Spectra;
• Astronomical Photometry;
• Early Stars;
• Helium;
• Peculiar Stars;
• Astrophysics;
• STARS: ABUNDANCES;
• STARS: EARLY-TYPE;
• STARS: INDIVIDUAL CONSTELLATION NAME: ALPHA LYRAE