Other
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..742h&link_type=abstract
Astrophysical Journal, Part 1, vol. 214, June 15, 1977, p. 742-746.
Other
14
A Stars, Abundance, Early Stars, Metallic Stars, Star Clusters, Calcium, Electrophotometers, K Lines, Stellar Models, Stellar Spectrophotometry, Ubv Spectra
Scientific paper
Calcium K-line photometry is reported for 27 A-type stars in the Praesepe cluster, and the data obtained are compared with previous K-line observations of Hyades stars. It is found that calcium and other metals are generally overabundant in Praesepe relative to field stars and that there is a considerable scatter in metal-abundance indices. Comparison with the Hyades results indicates that the Praesepe stars are as metal-enriched as the Hyades stars. These results are taken as evidence favoring Eggen's (1960) proposal that the Hyades and Praesepe clusters should be regarded as a single group having, on the average, about a factor-of-two higher metal abundance than solar-neighborhood field stars as well as a high internal dispersion in metal-line strengths. The questions of where and how the Praesepe-Hyades stars acquired their high average metal abundances, K-line strengths, and associated dispersions are briefly considered.
Anderson Rachel
Henry Richard C.
Hesser James Edward
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