Elemental Abundances in Evolved Supergiants. II. The Young Clusters H and χ Persei

Details Elemental Abundances in Evolved Supergiants. II. The Young Clusters H and χ Persei Elemental Abundances in Evolved Supergiants. II. The Young Clusters H and χ Persei

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....119.1839g&link_type=abstract

The Astronomical Journal, Volume 119, Issue 4, pp. 1839-1847.

Astronomy and Astrophysics

Astronomy

5

Stars: Abundances, Stars: Agb And Post-Agb, Stars: Chemically Peculiar

Scientific paper

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.

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