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Spectral variability in early-type binary X-ray systemsTheoretical models for the ionization of trace elements in a strong stellar wind by a compact binary X-ray source and for the resulting orbital phase dependence of the emergent soft X-ray spectra and the profiles of ultraviolet resonance lines are presented. Model results agree qualitatively with the X-ray and ultraviolet spectra of the system 4U 0900-40/HD 77581 and explain the suppression of the absorption profiles of the Si IV upsilon 1394 and C IV upsilon 1548 lines when the X-ray sources is in front of the star. The model predicts that the absorption profiles of the N V upsilon 1239 and O VI upsilon 1032 lines will be enhanced rather than suppressed during this orbital phase. We predict phase-dependent linear polarization in the resonance lines profiles. Future observations of these phase dependent effects in early-type binary X-ray systems may be used to investigate the dynamics of stellar winds and their interactions with the X-ray source.
Document ID
19840011127
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Mccray, R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kallman, T. R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Castor, J. I. (California Univ. Lawrence Livermore Lab., United States)
Olson, G. L. (Los Alamos Scientific Lab. N. Mex., United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1984
Subject Category
Astronomy
Report/Patent Number
NASA-TM-86060
NAS 1.15:86060
Accession Number
84N19195
Funding Number(s)
CONTRACT_GRANT: NSF AST-80-19874
CONTRACT_GRANT: NSG-7128
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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