Abstract
view Abstract Citations (70) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Large Magellanic Cloud Supersoft X-Ray Binary RX J0513.9-6951 Crampton, David ; Hutchings, J. B. ; Cowley, A. P. ; Schmidtke, P. C. ; McGrath, T. K. ; O'Donoghue, D. ; Harrop-Allin, M. K. Abstract A detailed analysis of simultaneous photometric and spectroscopic observations of the optical counterpart of the LMC "supersoft" X-ray source RX J0513.9 - 6951 (identified with HV 5682) is presented. The spectrum is dominated by He II emission lines and H + He II blends; no He I is observed, but several higher ionization emission features, especially O VI (3811, 3834, and 5290 Å), are prominent. Radial velocity measurements suggest a binary period of 0.76 days. If the small velocity amplitude, K ∼ 11 km s-11, is interpreted as orbital motion, this implies that the binary system contains a somewhat evolved star plus a relatively massive compact object, viewed nearly pole-on. No orbital photometric variations were found, although irregular brightness changes of ∼0.3 mag occurred. Unusual emission lines are observed that cannot be identified except as high-velocity (4000 km s-1) bipolar outflows or jets. These outflows are seen in H and He II at the same positive and negative velocities. They were relatively stable for periods of about 5 days, but their velocities appear to have been about 250 km s-1 smaller in 1992 than in 1993 or 1994. Publication: The Astrophysical Journal Pub Date: January 1996 DOI: 10.1086/176653 arXiv: arXiv:astro-ph/9507029 Bibcode: 1996ApJ...456..320C Keywords: ACCRETION; ACCRETION DISKS; STARS: BINARIES: SPECTROSCOPIC; STARS: INDIVIDUAL ALPHANUMERIC: RX J0513.9-6951; X-RAYS: STARS; Astrophysics E-Print: uuencoded compressed postscript, 19 pages including 4 tables. Figures available from authors. Also available at http://www.dao.nrc/DAO/SCIENCE/ . Accepted for publication in ApJ full text sources arXiv | ADS | data products SIMBAD (9) NED (1)
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