Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...289..279c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 289, Feb. 1, 1985, p. 279-299. Research supported by the Alfred P. Sloan Fo
Astronomy and Astrophysics
Astrophysics
104
Heao 2, Pleiades Cluster, Star Clusters, Stellar Radiation, Stellar Rotation, X Ray Sources, F Stars, G Stars, K Stars, Late Stars, Open Clusters, Stellar Coronas, Stellar Luminosity, Stellar Spectra, Variable Stars
Scientific paper
The results of a 0.1-4.5-keV X-ray survey of a 2 x 2-deg area centered on the Pleiades open cluster, performed using the imaging proportional counter and high-resolution imager of the Einstein Observatory on four days in 1980-1981, are presented in extensive tables, graphs, maps, histograms, and finding charts and characterized. A total of 61 sources are detected, and 44 of these are identified with cluster members of spectral types B-M. Findings discussed include Lx/Lbol of 10 the -7th for early-type stars; F-star mean Lx like that of F stars in the Hyades and in the field (denying time evolution of Lx); mean G-star Lx = 3.7 x 10 to the 29th erg/sec; G-star activity decay more gradual than 1/sq rt t, with sharp fall for t greater than 1 Gyr; and no evidence for X-ray-emissivity/rotational-velocity correlation in a homogeneous sample of K dwarfs or a sample of K and M stars with established V sin i data.
Caillault Jean-Pierre
Helfand David J.
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