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X-ray studies of coeval star samples. II - The Pleiades cluster as observed with the Einstein ObservatoryCoronal 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.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Micela, G.
(Osservatorio Astronomico Palermo, Italy)
Sciortino, S.
(Osservatorio Astronomico Palermo, Italy)
Vaiana, G. S.
(Osservatorio Astronomico Palermo, Italy)
Harnden, F. R., Jr.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Rosner, R.
(Chicago, University IL, United States)
Date Acquired
August 14, 2013
Publication Date
January 10, 1990
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 348
ISSN: 0004-637X
Subject Category
Accession Number
Funding Number(s)
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