Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..557m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 10, 1990, p. 557-579. Research supported by ASI, MPI, CNR, and Ma
Astronomy and Astrophysics
Astrophysics
89
A Stars, F Stars, Heao 2, Pleiades Cluster, X Ray Sources, Emission Spectra, Hertzsprung-Russell Diagram, Spatial Distribution, Stellar Magnitude
Scientific paper
Coronal X-ray emission of the Pleiades stars is investigated, and maximum likelihood, integral X-ray luminosity functions are computed for Pleiades members in selected color-index ranges. A detailed search is conducted for long-term variability in the X-ray emission of those stars observed more than once. An overall comparison of the survey results with those of previous surveys confirms the ubiquity of X-ray emission in the Pleiades cluster stars and its higher rate of emission with respect to older stars. It is found that the X-ray emission from dA and early dF stars cannot be proven to be dissimilar to that of Hyades and field stars of the same spectral type. The Pleiades cluster members show a real rise of the X-ray luminosity from dA stars to early dF stars. X-ray emission for the young, solarlike Pleiades stars is about two orders of magnitude more intense than for the nearby solarlike stars.
Harnden Frank R. Jr.
Micela Giuseppina
Rosner Robert
Schmitt Juergen H. M. M.
Sciortino Salvatore
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