Far-Ultraviolet Spectroscopy of the Supersoft X-Ray Binary RX J0513.9−6951

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DOIResolve DOI: http://doi.org/10.1086/343839
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TypeArticle
Journal titleThe Astronomical Journal
ISSN0004-6256
Volume124
Issue5
Pages28332840; # of pages: 8
Subjectbinaries: close; ISM: jets and outflows; stars: individual (RX J0513.9-6951); ultraviolet emission; X-rays
AbstractWe have obtained spectroscopy with the Far Ultraviolet Spectroscopic Explorer (FUSE) of the supersoft X-ray binary RX J0513.9-6951 over a complete binary orbital cycle. The spectra show a hot continuum with extremely broad O VI emission and weak Lyman absorptions. He II emission is weak and narrow, while N III and C III emissions are undetected, although lines from these ions are prominent at optical wavelengths. The broad O VI emission and Lyman absorption show radial velocity curves that are approximately antiphased and have semiamplitudes of ~117 +- 40 and 54 +- 10 km/s, respectively. Narrow emissions from He II and O VI show small velocity variations with phasing different from the broad O VI, but consistent with the optical line peaks. We also measure considerable changes in the FUV continuum and O VI emission line flux. We discuss the possible causes of the measured variations and a tentative binary interpretation.
Publication date
LanguageEnglish
AffiliationNRC Herzberg Institute of Astrophysics; National Research Council Canada
Peer reviewedYes
NPARC number21275273
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Record identifierb36874fe-d772-4356-bfc6-7e7541928c70
Record created2015-05-28
Record modified2016-05-09
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