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X-ray emission at low-mass end of the MS - Results from an extensive Einstein Observatory surveyThe 0.16-4.0 keV X-ray emission from K and M stars of luminosity classes IV, V, and VI within 25 parsec of the sun was measured using all available Einstein Observatory IPC data and a critical compilation of catalogued optical data. Fifty four of 88 stars were detected, 70 of 138 M stars with Mv less than 13.4 (corresponding to M6) and 15 or 31 fainter M stars. The surveyed stars were grouped, on the basis of U, V, W space velocity components, into old-disk, young-disk, and halo population stars. Then, a subsample was selected which is statistically representative of the population of K and M stars in the solar neighborhood, on the basis of which unbiased Maximum Likelihood X-ray luminosity functions were constructed for K, early M, and late M stars. The investigation revealed a decrease of X-ray luminosity with increasing stellar age in the range of ages of disk population stars.
Document ID
19930042170
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Barbera, M.
(CNR Ist. per le Applicazioni Interdisciplinari della Fisica, Palermo, Italy)
Micela, G.
(NASA Headquarters Washington, DC United States)
Sciortino, S.
(NASA Headquarters Washington, DC United States)
Vaiana, G. S.
(Palermo Osservatorio Astronomico, Italy)
Harnden, F. R., Jr.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Rosner, R.
(Chicago Univ. IL, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Societa Astronomica Italiana, Memorie
Volume: 63
Issue: 3-4
ISSN: 0037-8720
Subject Category
Astrophysics
Accession Number
93A26167
Distribution Limits
Public
Copyright
Other

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