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X-ray and ultraviolet spectroscopy of Cygnus X-1 = HDE 226868Observations of Cygnus X-1 with the solid-state spectrometer on the Einstein Observatory are presented. The X-ray spectra of two intensity dips viewed near superior conjunction did not exhibit increased photoelectric absorption. Rather, the data support a model in which an increase in the electron-scattering optical depth modifies both the observed spectrum and the intensity. The characteristic temperature of the intervening material is greater than about 50 million K. These measurements were in part simultaneous with observations by IUE. The ultraviolet spectrum and intensity remained relatively constant during an X-ray intensity dip.
Document ID
19800055222
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1086/183237
Authors
Pravdo, S. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
White, N. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Becker, R. H. (NASA Goddard Space Flight Center Greenbelt; Maryland University, College Park, Md., United States)
Kondo, Y. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Boldt, E. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Holt, S. S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Serlemitsos, P. J. (NASA Goddard Space Flight Center Greenbelt, Md., United States)
Mccluskey, G. E. (Lehigh University Bethlehem, Pa., United States)
Date Acquired
August 10, 2013
Publication Date
May 1, 1980
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
80A39392
Distribution Limits
Public
Copyright
Other

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