Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..476l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 1, 1989, p. 476-488.
Astronomy and Astrophysics
Astrophysics
52
Abundance, Cepheid Variables, Stellar Composition, Supergiant Stars, Variable Stars, Echelle Gratings, Heavy Elements, Mass Ratios, Metallicity, Stellar Atmospheres
Scientific paper
Abundance analyses of four low-mass supergiant variable stars and two Population I Cepheids have been carried out. The Population I Cepheids show normal, solar element ratios, and the low-mass variables show metallicities ranging from solar down to (Fe/H) values typical of thick-disk and, in a few cases, of halo stars. Most low-mass variables show a systematic underabundance of the heavy s- and r-process elements. The heavy-element underabundances correlate with second ionization potential in a manner suggesting that they are a non-LTE phenomenon arising from overionization by Lyman-continuum photons. Several low-mass variables, including RU Cen and V553 Cen, show carbon enhancements and solar s-process abundances. Relative to the majority of the type II variables, these stars are s-process enhanced, and it is argued that they are related to the Ba II and CH stars.
Bond Howard E.
Luck Earle R.
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