EINSTEIN observations of BY Draconis variables and RS CVn binaries
Observations of five BY Draconis variables and four RS Canum Venaticorum systems with the Einstein observatory are presented. All nine stars were detected. Although the BY Draconis stars have an average x-ray luminosity one to two orders of magnitude lower than the RS CVn binaries, at least three of these systems fit the L/sub x//L/sub bol/-vs-period relation first described by Walter and Bowyer for RS CVn's. Since one of the BY Draconis stars is almost certainly single, this result lends strong support to the suggestion that rapid rotation, and not duplicity, is the determining factor in defining the level of stellar activity in such stars. In addition, the x-ray data are consistent with the suggestion, made by Vogt and Fekel, that the BY Draconis stars are in the final stages of pre-main-sequence evolution.
- Research Organization:
- Columbia Astrophysics Laboratory, 538 West 120th Street, New York, New York 10027
- OSTI ID:
- 5577693
- Journal Information:
- Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 87:3; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METALS
BINARY STARS
CALCIUM
ELECTROMAGNETIC RADIATION
ELEMENTS
IONIZING RADIATIONS
LUMINOSITY
MATHEMATICAL MODELS
METALS
MOTION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
ROTATION
STAR MODELS
STARS
VARIABLE STARS
X RADIATION