Astron. Astrophys. 332, 189-193 (1998)

Acknowledgements

First results have been presented in a poster during the 1997 Netherlands Astronomy Conference in Dalfsen. I thank W.Hartmann from SRON for providing the LTE and NLTE white dwarf atmosphere spectra. I thank D. Bhattacharya for discussions. I thank the referee E.P.J. van den Heuvel for useful comments. I thank K.P. Singh for helpful discussions. This research was supported in part by the Netherlands Organisation for Scientific Research (NWO) through Spinoza Grant 08-0 to E.P.J. van den Heuvel.

© European Southern Observatory (ESO) 1998

Online publication: March 10, 1998
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