Rotation periods of open-cluster stars, 2

Details Rotation periods of open-cluster stars, 2 Rotation periods of open-cluster stars, 2

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105.1407p&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 694, p. 1407-1414

Astronomy and Astrophysics

Astronomy

49

Star Clusters, Stellar Activity, Stellar Rotation, Stellar Spectrophotometry, Brightness, Dwarf Stars, Stellar Luminosity, X Ray Density Measurement

Scientific paper

We present the results from a photometric monitoring program of 21 stars observed during 1992 in the Pleiades and Alpha Persei open clusters. Period determinations for 16 stars are given, 13 of which are the first periods reported for these stars. Brightness variations for an additional five cluster stars are also given. One K dwarf member of the alpha Per cluster is observed to have a period of rotation of only 4.39 hr. perhaps the shortest period currently known among BY Draconis variables. The individual photometric measurements have been deposited with the NSSDC. Combining current X-ray flux determinations with known photometric periods, we illustrate the X-ray activity/rotation relation among Pleiades K dwarfs based on available data.

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