Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-18
Astronomy and Astrophysics
Astrophysics
accepted for publication in Astronomy and Astrophysics, 6 pages, 2 figures
Scientific paper
10.1051/0004-6361:20020104
We present the X-ray spectrum of MR Vel/RXJ0925.7-4758 obtained with the Medium Energy Grating spectrometer of the Chandra X-ray Telescope. The simplest models used by earlier authors, stellar atmospheres in combination with a thermal plasma in collisional ionization equilibrium, cannot explain the spectrum. Neither does a photo-ionized plasma. We identify P Cygni profiles of Fe XVII and O VIII, from which we conclude that these lines arise in a wind. We conclude that major uncertainty exists about the bolometric luminosity of MR Vel, and perhaps of supersoft sources in general, so that the theoretical prediction that this luminosity derives from steady nuclear burning cannot be verified.
Bearda Henk
der Meer Rob van
Ebisawa Ken
Hartmann Wouter
Heise John
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