Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.2968l&link_type=abstract
Astronomical Journal v.110, p.2968
Astronomy and Astrophysics
Astronomy
56
Stars: Giants, Stars: Abundances, Stars: Emission-Line
Scientific paper
Stellar parameters and abundances for a sample of 55 U/K field giants of which 22 are normal stars and the other 33 are classified as VSL (very strong-lined) have been determined based on high-resolution and high signal-to-noise KPNO coudé spectra. The primary pertinent points of comparison between these stars are: VSL stars have [Fe/H] ratios that average +0.1 dex relative to normal giants; VSL stars are modestly carbon and nitrogen rich relative to the normal stars. The mean difference in [C/Fe] is +0.1 and for [N/Fe] is +0.05; the [O/Fe] ratios of the normal and VSL stars are comparable; the lithium abundances, 12C/13C ratios, and [M/Fe] ratio for Z > 10 are comparable in the two groups. The combination of the first through third points is sufficient to explain the difference in VSL and normal U/K giant spectra. Our preferred interpretation of the VSL stars is that they are the result of normal evolution of a dwarf whose initial composition is somewhat metal and carbon rich. The fraction of stars with these properties is consistent with the number of VSL giants.
Challener Sharon L.
Luck Earle R.
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