Abstract
view Abstract Citations (31) References (37) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Einstein obsvervations of BY DRA variables and RS CVn binaries. Caillault, J. -P. Abstract 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 X-ray/bolometric luminosity ratio-vs-period relation first described by Walter and Bowyer (1981) 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 (1979), that the BY Draconis stars are in the final stages of pre-main-sequence evolution. Publication: The Astronomical Journal Pub Date: March 1982 DOI: 10.1086/113129 Bibcode: 1982AJ.....87..558C Keywords: Eclipsing Binary Stars; Heao 2; Spaceborne Astronomy; Variable Stars; Astronomical Catalogs; Stellar Evolution; Stellar Luminosity; Astrophysics full text sources ADS | data products SIMBAD (10)
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