Weak-lined stars in the Michigan spectral survey. I - A-, F-, and G-type stars

Abstract

view Abstract Citations (14) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Weak-lined stars in the Michigan spectral survey. I. A-, F-, and G-type stars. Eggen, O. J. Abstract 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. Publication: The Astronomical Journal Pub Date: December 1984 DOI: 10.1086/113699 Bibcode: 1984AJ.....89.1878E Keywords: 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; Astronomy full text sources ADS | data products SIMBAD (116) GCPD (1)