| Issue |
A&A
Volume 381, Number 3, JanuaryIII 2002
|
|
|---|---|---|
| Page(s) | 982 - 992 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20011530 | |
| Published online | 15 January 2002 | |
The C and N abundances in disk stars *
1
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, gzhao@bao.ac.cn
Received:
31
May
2001
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
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