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An Einstein Observatory SAO-based catalog of B-type starsAbout 4000 X-ray images obtained with the Einstein Observatory are used to measure the 0.16-4.0 keV emission from 1545 B-type SAO stars falling in the about 10 percent of the sky surveyed with the IPC. Seventy-four detected X-ray sources with B-type stars are identified, and it is estimated that no more than 15 can be misidentified. Upper limits to the X-ray emission of the remaining stars are presented. In addition to summarizing the X-ray measurements and giving other relevant optical data, the present extensive catalog discusses the reduction process and analyzes selection effects associated with both SAO catalog completeness and IPC target selection procedures. It is concluded that X-ray emission, at the level of Lx not less than 10 exp 30 ergs/s, is quite common in B stars of early spectral types (B0-B3), regardless of luminosity class, but that emission, at the same level, becomes less common, or nonexistent, in later B-type stars.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Grillo, F.
(NASA Headquarters Washington, DC United States)
Sciortino, S.
(NASA Headquarters Washington, DC United States)
Micela, G.
(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)
Date Acquired
August 15, 2013
Publication Date
August 1, 1992
Publication Information
Publication: Astrophysical Journal Supplement Series
Volume: 81
Issue: 2, Au
ISSN: 0067-0049
Subject Category
Distribution Limits
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