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

J. B. Hutchings | Zendy; K. Winter | Zendy; A. P. Cowley | Zendy; P. C. Schmidtke | Zendy; D. Crampton | Zendy

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

Author(s) -

J. B. Hutchings,

K. Winter,

A. P. Cowley,

P. C. Schmidtke,

D. Crampton

Publication year - 2002

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/343839

Subject(s) - emission spectrum , spectroscopy , physics , ultraviolet , spectral line , astrophysics , binary number , line (geometry) , flux (metallurgy) , wavelength , absorption spectroscopy , chemistry , astronomy , optics , geometry , arithmetic , mathematics , organic chemistry

We have obtained spectroscopy with the Far Ultraviolet Spectroscopic Explorer(FUSE) of the supersoft X-ray binary RX J0513.9-6951 over a complete binaryorbital cycle. The spectra show a hot continuum with extremely broad O VIemission and weak Lyman absorptions. He II emission is weak and narrow, while NIII and C III emissions are undetected, although lines from these ions areprominent at optical wavelengths. The broad O VI emission and Lyman absorptionshow radial velocity curves that are approximately antiphased and havesemiamplitudes of ~117 +- 40 and 54 +- 10 km/s, respectively. Narrow emissionsfrom He II and O VI show small velocity variations with phasing different fromthe broad O VI, but consistent with the optical line peaks. We also measureconsiderable changes in the FUV continuum and O VI emission line flux. Wediscuss the possible causes of the measured variations and a tentative binaryinterpretation.Comment: 21 pages, including 2 tables, 6 figures. To appear in A

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