The C and N abundances in disk stars

Details The C and N abundances in disk stars The C and N abundances in disk stars

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...381..982s&link_type=abstract

Astronomy and Astrophysics, v.381, p.982-992 (2002)

Astronomy and Astrophysics

Astrophysics

22

Stars: Abundances, Stars: Late-Type, Galaxy: Evolution, Galaxy: Solar Neighbourhood

Scientific paper

Abundance analysis of carbon and nitrogen has been performed for a sample of 90 F and G type main-sequence disk stars with a metallicity range of -1.0 < [Fe/H] <+0.2 using the \ion{C} i and N I lines. We confirm a moderate carbon excess in the most metal-poor disk dwarfs found in previous investigations. Our results suggest that carbon is enriched by superwinds of metal-rich massive stars at the beginning of the disk evolution, while a significant amount of carbon is contributed by low-mass stars in the late stage. The observed behavior of [N/Fe] is about solar in the disk stars, irrespective of the metallicity. This result suggests that nitrogen is produced mostly by intermediate-mass stars. Based on observations carried out at National Astrono- mical Observatories (Xinglong, China).

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