Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1878e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, Dec. 1984, p. 1878-1886.
Astronomy and Astrophysics
Astronomy
12
A Stars, Blue Stars, Early Stars, F Stars, G Stars, H Beta Line, Horizontal Branch Stars, Stellar Spectrophotometry, Astrometry, Cepheid Variables, Light Curve, Radial Velocity, Stellar Color, Stellar Luminosity
Scientific paper
Data from intermediate-band and H-beta photometric observations of 89 early-type stars classified as weak-lined by Bidelman and MacConnell (1973), Houk and Cowley (1975), or Houk (1978 and 1982) are presented in tables and graphs and analyzed. The group is found to comprise 55 disk stars and 34 halo stars (Fe/H less than -0.65), including 21 near the main-sequence turnoff, seven red horizontal-branch stars, one blue horizontal-branch star, one suprahorizontal-branch object, and four blue stragglers; five of the newly identified halo stars are shown to have radial velocities in excess of 100 km/s. Special consideration is given to the 17 early-type members of Kapetyn's star group (Eggen, 1977), and the mean luminosity and Fe/H ratio of the four very-short-period Cepheids of this group are determined as 0.75 mag and -1.7.
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