Elemental Abundances in Evolved Supergiants. II. The Young Clusters H and χ Persei
Abstract
We report on the results of our analyses of high-quality spectra of M supergiants in the h and χ Persei double cluster. Our temperature estimates range from 3500 to 4000 K for a sample of 14 stars. There is a wide range in the lithium abundances, from [Li/Fe]=-1.7 to [Li/Fe]=-0.10. The 12C/13C ratio ranges from 10 to 16 and displays a weak trend with luminosity, such that the more luminous stars have a slightly smaller ratio. We find a significant excess of Na, which may be due to its production by proton capture by 22Ne. However, there is no evidence for the O deficiency that usually accompanies a Na excess in globular cluster stars.
- Publication:
-
The Astronomical Journal
- Pub Date:
- April 2000
- DOI:
- 10.1086/301319
- Bibcode:
- 2000AJ....119.1839G
- Keywords:
-
- STARS: ABUNDANCES;
- STARS: AGB AND POST-AGB;
- STARS: CHEMICALLY PECULIAR