Abstract
view Abstract Citations (29) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Photometric and Radial Velocity Study of Six Southern Cepheids. II. Binarity, Radii, Luminosities, and Masses Coulson, I. M. ; Caldwell, J. A. R. ; Gieren, W. P. Abstract The data now available for the Galactic Cepheids AQ Car (period = 9.77 days), XX Cen (10.95 days), XY Car (12.44 days), TT Aql (13.75 days), XX Car (15.71 days), and XZ Car (16.65 days) are analyzed for binarity, radius, luminosity, and mass. There is weak evidence only for binarity of XX Cen, XX Car, and XZ Car, and it is concluded that all six Cepheids may be considered to be single. The new velocity data for XX Cen suggest that it may belong to a binary system with an orbital period of 800 d. The radii are derived by an improved version of the Baade-Wesselink technique and are found to depend upon the color index used to define the surface brightness. The V - I radii, for instance, are 20-25 percent larger than the B - V radii, and it is suggested that the Cepheid mass discrepancy problem may be alleviated by use of appropriate colors in the B - W radius solutions. Publication: The Astrophysical Journal Pub Date: April 1986 DOI: 10.1086/164072 Bibcode: 1986ApJ...303..273C Keywords: Binary Stars; Cepheid Variables; Radial Velocity; Stellar Luminosity; Stellar Mass; Stellar Spectrophotometry; Astrometry; Mass To Light Ratios; Milky Way Galaxy; Orbital Elements; Radii; Southern Sky; Stellar Color; Astrophysics; STARS: BINARIES; STARS: CEPHEIDS; STARS: PULSATION full text sources ADS | data products SIMBAD (6) Related Materials (1) Part 1: 1985ApJS...57..595C
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