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Title: X-ray studies of coeval star samples. II. The Pleiades cluster as observed with the Einstein Observatory

Abstract

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. 77 refs.

Authors:
; ; ; ;  [1]
  1. (Osservatorio Astronomico, Palermo (Italy) Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA) Chicago Univ., IL (USA))
Publication Date:
OSTI Identifier:
6904944
Alternate Identifier(s):
OSTI ID: 6904944
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; (USA); Journal Volume: 348
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; STAR CLUSTERS; X RADIATION; COMPARATIVE EVALUATIONS; COSMIC X-RAY SOURCES; EMISSION SPECTRA; HERTZSPRUNG-RUSSELL DIAGRAM; LUMINOSITY; SPATIAL DISTRIBUTION; VARIATIONS; COSMIC RAY SOURCES; DIAGRAMS; DISTRIBUTION; ELECTROMAGNETIC RADIATION; IONIZING RADIATIONS; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; RADIATIONS; SPECTRA 640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar, Radio & X-Ray Sources

Citation Formats

Micela, G., Sciortino, S., Vaiana, G.S., Harnden, F.R. Jr., and Rosner, R. X-ray studies of coeval star samples. II. The Pleiades cluster as observed with the Einstein Observatory. United States: N. p., 1990. Web. doi:10.1086/168263.
Micela, G., Sciortino, S., Vaiana, G.S., Harnden, F.R. Jr., & Rosner, R. X-ray studies of coeval star samples. II. The Pleiades cluster as observed with the Einstein Observatory. United States. doi:10.1086/168263.
Micela, G., Sciortino, S., Vaiana, G.S., Harnden, F.R. Jr., and Rosner, R. Mon . "X-ray studies of coeval star samples. II. The Pleiades cluster as observed with the Einstein Observatory". United States. doi:10.1086/168263.
@article{osti_6904944,
title = {X-ray studies of coeval star samples. II. The Pleiades cluster as observed with the Einstein Observatory},
author = {Micela, G. and Sciortino, S. and Vaiana, G.S. and Harnden, F.R. Jr. and Rosner, R.},
abstractNote = {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. 77 refs.},
doi = {10.1086/168263},
journal = {Astrophysical Journal; (USA)},
number = ,
volume = 348,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1990},
month = {Mon Jan 01 00:00:00 EST 1990}
}