X-ray-selected candidates for the RS CVn and W UMa classes of binary stars

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115170· OSTI ID:5402787

Fleming, T A; Gioia, I M; Maccacaro, T ^[1]

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1. Joint Institute for Laboratory Astrophysics, Boulder, CO (USA)

X-ray luminosity, spectral type, radial-velocity variation, rotationally broadened line profile, and Ca II H and K line emission data are used to identify 12 new candidates for the RS CVn class and seven new candidates for the W UMa class from spectroscopic binaries which are contained in the Einstein Extended Medium Sensitivity Survey. Under the assumption that the candidates are genuine members of each class, local space density estimates of 4.47 + or - 1.19 x 10 to the -4th/cu pc for RS CVn binaries and 8.47 + or - 3.00 x 10 to the -5th/cu pc for W UMa binaries are found. Although the density estimate for the W UMa binaries is shown to be consistent with previous estimates obtained from optically selected samples, the estimate for the RS CVn binaries is more than an order of magnitude greater than previously determined space densities. 40 refs.

• OSTI ID: 5402787
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 98; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METALS
BINARY STARS
CALCIUM
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
DENSITY
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
IONIZING RADIATIONS
LUMINOSITY
METALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIAL VELOCITY
RADIATIONS
SPECTRA
STARS
VARIATIONS
VELOCITY
X RADIATION