Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..649t&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 6, p. 649-662.
Astronomy and Astrophysics
Astronomy
26
A Stars, Atmospheric Composition, B Stars, Metallicity, Nonequilibrium Thermodynamics, Stellar Atmospheres, Carbon, Nitrogen, Oxygen, Photosphere
Scientific paper
The statistical equilibrium of carbon and nitrogen in the atmosphere of Vega is studied in order to determine their photospheric abundances. It is shown that the non-LTE abundance corrections for nitrogen depend significantly on the metallicity of the atmospheric model used for the analysis. The N-abundance of Fe is estimated to be log epsilon(N) about 7.2; this indicates a significant underabundance of nitrogen, by as much as 0.8 dex, compared to that of the sun. The non-LTE analysis of carbon is found to be only mildly affected by the model metallicity, so that log epsilon(C) is about 8.3-8.4, a slight underabundance by 0.2-0.3 dex relative to the sun. The findings of underabundance of light elements in Vega does not conform to the general characteristics of Lambda Bootis stars.
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