Nitrogen and sulfur overabundances in the population II supergiant HD 46703

Details Nitrogen and sulfur overabundances in the population II supergiant HD 46703 Nitrogen and sulfur overabundances in the population II supergiant HD 46703

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..203b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 1, 1987, p. 203-210.

Astronomy and Astrophysics

Astrophysics

54

Abundance, Nitrogen, Stellar Composition, Sulfur, Supergiant Stars, A Stars, Globular Clusters, Infrared Spectra, Nuclear Reactions, Planetary Nebulae

Scientific paper

The high-velocity star HD 46703 is a field analog of the rare A- and F-type supergiants, that lie several magnitudes above the horizontal branches in globular clusters. In a previous abundance analysis of HD 46703 it was shown that carbon and oxygen are overabundant by factors of more than 10. New observations reveal an extreme overabundance of nitrogen; a spectrum-synthesis analysis yields [N/Fe] = +1.8. Sulfur is also overabundant with [S/Fe] = +1.2. Implications of these results for nucleosynthesis in evolved stars is discussed. It is speculated that the excess sulfur is 32S that was synthesized during a core helium flash through successive alpha captures on 12C.

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