Flare stars in the Pleiades. II

Abstract

Translated from Astrofizika; 7: No. 3, 319-331(1971) . The results are given of observations of flare stars in the Pleiades at Byurakan in the winter of 1969--1970 and partly in the second half of 1970. They are supplemented by observations at Asiago and Konkoly. Of 44 new flare stars, 14 were detected on the plates of the 40'', 11 on the plates of the 21'' Schmidt telescopes of the Byurakan Observatory, 15 at Asiago, 2 at the Konkoly Observatory, one independently at Byurakan and Asiago, and one simultaneously in the two Byurakan telescopes. The total number of already known flare stars in the region of the Pleiades (16 square degrees) is 208. Some of these are probably not members of the cluster. lt is estimated that the lower limit to the number of flare stars in this region is 700. Evidence in favor of strong, but slow, variations in the activity of some flare stars in the Pleiades is given. in the Appendix are given data on flare stars in the Pleiades observed at Byurakan after the paper was submitted. (auth)