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Astron. Astrophys. 335, 995-1002 (1998)

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We are grateful to Drs. E. Gosset and J.-P. Swings for their helpful remarks. We wish to thank the referee, Dr. L. Kaper, for his careful reading of the manuscript and his constructive suggestions. We are greatly indebted to the Fonds National de la Recherche Scientifique (Belgium) for multiple supports. This research is also supported in part by contract ARC 94/99-178 "Action de recherche concertée de la Communauté Française" (Belgium) and by contract P4/05 "Pôle d'Attraction Interuniversitaire" (SSTC-Belgium). Partial support through the PRODEX XMM-OM Project is also gratefully acknowledged. The travels to OHP for the observing runs were supported by the Ministère de l'Enseignement Supérieur et de la Recherche de la Communauté Française. The SIMBAD database has been consulted for the bibliography.

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© European Southern Observatory (ESO) 1998

Online publication: June 26, 1998