Carbon, nitrogen and oxygen abundances in yellow supergiants.

Details Carbon, nitrogen and oxygen abundances in yellow supergiants. Carbon, nitrogen and oxygen abundances in yellow supergiants.

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305..911b&link_type=abstract

Astronomy and Astrophysics, v.305, p.911

Astronomy and Astrophysics

Astrophysics

11

Stars: Abundances, Interiors, Rotation

Scientific paper

Carbon, nitrogen and oxygen abundances were measured in a sample of 9 yellow supergiants for which accurate rotational velocities are now available. We obtain [O/Fe]=~-0.2, a result consistent with other young objects (main sequence B stars, planetary nebulae, H II regions). We also find [C/Fe]=~-0.2 for 7 stars, and =~0.0 for another 2 ones, and [N/Fe]=~0.0 for 6 stars and =~+0.2 for the other 3 ones. Stars showing low carbon and/or high nitrogen are assumed to show convective mixing effects. The present results seem to indicate that, among the low rotation supergiants located near the rotational discontinuity at F9Ib, a fraction of them shows no mixing, and another fraction does show mixing effects, probably depending on their evolutionary stage.

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