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The Einstein objective grating spectrometer survey of galactic binary X-ray sourcesThe results of observations of 22 bright Galactic X-ray point sources are presented, and the most reliable measurements to date of X-ray column densities to these sources are derived. The results are consistent with the idea that some of the objects have a component of column density intrinsic to the source in addition to an interstellar component. The K-edge absorption due to oxygen is clearly detected in 10 of the sources and the Fe L and Ne K edges are detected in a few. The spectra probably reflect emission originating in a collisionally excited region combined with emission from a photoionized region excited directly by the central source.
Document ID
19910062714
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Vrtilek, S. D. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Mcclintock, J. E. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Seward, F. D. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Kahn, S. M. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Wargelin, B. J. (California, University Berkeley, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1991
Publication Information
Publication: Astrophysical Journal Supplement Series
Volume: 76
ISSN: 0067-0049
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAG8-494
CONTRACT_GRANT: NAS8-30751
Distribution Limits
Public
Copyright
Other