A photometric and radial velocity study of six southern Cepheids. II - Binarity, radii, luminosities, and masses

Details A photometric and radial velocity study of six southern Cepheids. II - Binarity, radii, luminosities, and masses A photometric and radial velocity study of six southern Cepheids. II - Binarity, radii, luminosities, and masses

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303..273c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 273-279.

Astronomy and Astrophysics

Astrophysics

28

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

Scientific paper

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.

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