Other
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..188l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 1, 1990, p. 188-203. Research supported by the Robert A. Welch Fo
Other
91
A Stars, Chemical Composition, F Stars, Stellar Evolution, Supergiant Stars, Globular Clusters, Milky Way Galaxy, Star Formation, Stellar Mass
Scientific paper
The atmospheric parameters and chemical composition of HR 6144, HD 161796, 89 Her, and HR 7671, four representative members of the class of A- and F-type supergiants lying at high Galactic latitudes, are determined. The abundance results for HR 6144, HD 161796, and 89 Her are strongly atypical of Population I supergiants in that they are slightly metal-poor and have an overabundance of both C and N. Their locations in the H-R diagram and the difficulty of assigning them to Population I suggest that high-latitude supergiants are low-mass stars in a post-AGB evolutionary stage. However, they do not reveal the heavy s-process element enhancements seen in highly evolved B stars. HR 7671 differs from the other three stars in that it is very metal-poor, slightly deficient in C and O, has s-process abundances enhanced by a factor of four above solar, and has a surprising amount of Li. It may be a post-AGB star descended from a Li-rich S-type star.
Bond Howard E.
Lambert David L.
Luck Earle R.
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