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X-ray and UV spectroscopy of Cygnus X-1 = HDE226868Observations are presented of Cygnus X-1 with the solid-state spectrometer on the Einstein Observatory. 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 5 x 10 to the 7th power K. These measurements were in part simultaneous with observations by IUE. The ultra violet spectrum and intensity remained relatively constant during an X-ray intensity dip.
Document ID
19800014739
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
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)
Kondo, Y. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Becker, R. H. (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, B. G. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 4, 2013
Publication Date
February 1, 1980
Subject Category
Astronomy
Report/Patent Number
NASA-TM-80646
Report Number: NASA-TM-80646
Accession Number
80N23228
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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