Carbon and nitrogen abundances in old, very metal-poor stars A reprise based on the low-resolution Lick survey

Details Carbon and nitrogen abundances in old, very metal-poor stars A reprise based on the low-resolution Lick survey Carbon and nitrogen abundances in old, very metal-poor stars A reprise based on the low-resolution Lick survey

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..339l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, May 1984, p. 339-348.

Other

39

Abundance, Carbon, Late Stars, Nitrogen, Stellar Evolution, Giant Stars, Globular Clusters, Metallicity, Milky Way Galaxy, Nuclear Fusion

Scientific paper

A summary is given of the carbon and nitrogen abundances found in the Lick survey of nearly 300 old, very metal-poor stars (Fe/H of less than -1.3). The survey consists of population samples drawn from various stellar subsystems of the Galaxy as well as different stages of stellar evolution. The question of whether a systematic pattern of carbon depletion and nitrogen enhancement emerges within the data was examined and three conclusions were made: (1) the average value of (C + N)/Fe lies within narrow limits for all stellar subsystems, suggesting that the large nitrogen enhancement found in many evolved metal-poor stars is the result of interior C and N mixing; (2) the degree of carbon depletion and corresponding nitrogen enhancement is much larger than predicted by classical evolutionary theory; and (3) the extensive CN processing that occurs in evolved metal-poor stars proceeds further in some stellar subsystems than in others. This is particularly true of the most metal-poor halo field giants vis-a-vis giants in M15 and M92.

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