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Einstein Observatory survey of X-ray emission from solar-type stars - The late F and G dwarf starsResults of a volume-limited X-ray survey of stars of luminosity classes IV and V in the spectral range F7-G9 observed with the Einstein Observatory are presented. Using survival analysis techniques, the stellar X-ray luminosity function in the 0.15-4.0 keV energy band for both single and multiple sources. It is shown that the difference in X-ray luminosity between these two classes of sources is consistent with the superposition of individual components in multiple-component systems, whose X-ray properties are similar to those of the single-component sources. The X-ray emission of the stars in our sample is well correlated with their chromospheric CA II H-K line emission and with their projected equatorial rotational velocity. Comparison of the X-ray luminosity function constructed for the sample of the dG stars of the local population with the corresponding functions derived elsewhere for the Hyades, the Pleiades, and the Orion Ic open cluster confirms that the level of X-ray emission decreases with stellar age.
Document ID
19870062202
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Maggio, A. (Osservatorio Astronomico Palermo, Italy)
Sciortino, S. (Palermo Osservatorio Astronomico, Italy)
Vaiana, G. S. (Palermo, Osservatorio Astronomico, Italy; Harvard-Smithsonian Center for Astrophysics, Cambridge M, United States)
Majer, P. (Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Obserwatorium Astronomiczne, Wroclaw P, United States)
Bookbinder, J. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 13, 2013
Publication Date
April 15, 1987
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 315
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS8-30751
CONTRACT_GRANT: NAG8-445
CONTRACT_GRANT: NAGW-112
Distribution Limits
Public
Copyright
Other