The Galactic Supersoft X-Ray Binary RX J0925.7-4758 (MR Velorum)

Details The Galactic Supersoft X-Ray Binary RX J0925.7-4758 (MR Velorum) The Galactic Supersoft X-Ray Binary RX J0925.7-4758 (MR Velorum)

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aj....120..935s&link_type=abstract

The Astronomical Journal, Volume 120, Issue 2, pp. 935-942.

Astronomy and Astrophysics

Astronomy

10

Stars: Binaries: Close, Stars: Fundamental Parameters, Stars: Individual (Mr Velorum), X-Rays

Scientific paper

New simultaneous photometric and spectroscopic observations of the supersoft X-ray binary RX J0925.7-4758 (MR Vel) have been obtained. These confirm the unusually long orbital period near 3.8 days. An accurate period is determined based on several years of photometric observations. Short-term photometric variability (~0.25 days) is also present, but it does not appear to be strictly periodic. The spectroscopic behavior reveals large-amplitude He II and H velocity curves, indicating that the system is viewed from a moderately high inclination angle. Masses for the component stars are derived. Evidence of a high-velocity jet (outflow velocity of 5350 km s-1) is present at Hα. Its radial velocity curve is very similar to the disk emission lines, suggesting the jet is formed near the compact star. A new model for the system is presented.

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