The galactic supersoft X-ray binary RX J0925.7-4758 (MR Velorum)

P. C. Schmidtke, A. P. Cowley, V. A. Taylor, David Crampton, J. B. Hutchings

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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.

Original languageEnglish (US)
Pages (from-to)935-942
Number of pages8
JournalAstronomical Journal
Issue number2
StatePublished - Aug 2000

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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