Carbon and nitrogen abundance determinations from transition layer lines

Details Carbon and nitrogen abundance determinations from transition layer lines Carbon and nitrogen abundance determinations from transition layer lines

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a.381b&link_type=abstract

In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 381-384 (SEE N89-10682 01-89)

Astronomy and Astrophysics

Astronomy

2

Abundance, Giant Stars, Iue, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, Stellar Composition, Stellar Evolution

Scientific paper

For red giants a smooth increase in the nitrogen to carbon abundance ratio for increasing B-V as is expected for the first dredge up phase when the outer convection zone deepens is found. An average increase in the nitrogen to silicon ratio for B-V = 0.6 which goes back to almost solar values for cool giants with B - V approximately 1.0 is reported. It looks as if Si would be enriched for deeper mixing contrary to expectations from standard evolution theory.

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