The C and N abundances in disk stars *
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
2 Chinese Academy of Sciences – Peking University Joint Beijing Astrophysical Center, Beijing 100871, PR China
Corresponding author: G. Zhao, email@example.com
Accepted: 29 October 2001
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 [Fe/H] using the and 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.
Key words: stars: abundances / stars: late–type / Galaxy: evolution / Galaxy: solar neighbourhood
© ESO, 2002