Abstract

We describe the infrared spectrum of the galactic supersoft X-ray source MR Vel (RX J0925.7-4758) in the wavelength range of 1.1-2.6 ?m. We find Paschen, Brackett, He I, He II and neutral and ionized oxygen lines in emission. No traces of the secondary star were found. P-Cygni profiles were observed in Paschen ? and Brackett ?, from which we conclude that these lines arise in a wind. Fitting the optical and infrared energy distribution with a supercritical disk model, incorporating white dwarf and secondary star contributions, we were able to constrain the distance to 2-5 kpc, which implies an absolute magnitude MV between -2 and 0.