EDP Sciences
Free access
Volume 402, Number 1, April IV 2003
Page(s) 315 - 319
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030262

A&A 402, 315-319 (2003)
DOI: 10.1051/0004-6361:20030262

Infrared spectroscopy of the supersoft X-ray source MR Vel

R. E. Mennickent1, K. Matsumoto2 and M. Diaz3

1  Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Casilla 160-C, Concepción, Chile
2  Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
3  Instituto Astronômico e Geofísico, Universidade de São Paulo, Brazil

(Received 5 November 2002 / Accepted 14 February 2003)

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 $\mu$m. We find Paschen, Brackett, $\ion{He}{I}$, $\ion{He}{II}$ and neutral and ionized oxygen lines in emission. No traces of the secondary star were found. P-Cygni profiles were observed in Paschen $\beta$ and Brackett $\gamma$, 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.

Key words: accretion, accretion disks - stars: emission-line - X-rays: stars - infrared: stars - stars: individual: MR Vel

Offprint request: R. E. Mennickent, rmennick@stars.cfm.udec.cl

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