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Astron. Astrophys. 363, 755-766 (2000)

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We are indebted to L.G. Balázs and M. Kun for their valuable help and acknowledge the remarks of K. Mattila. S.N. appreciates very much the financial support of Petnica Science Center (Valjevo, Yugoslavia) for travel and stay at OSO during the observations, and the Onsala Space Observatory for the fellowship for the 1998/99 year.

This research has made use of data obtained through the High Energy Astrophysics Science Archive Research Center Online Service, provided by the NASA-Goddard Space Flight Center.

Onsala Space Observatory is the Swedish National Facility for Radio Astronomy and is operated by Chalmers University of Technology, Göteborg, Sweden, with financial support from the Swedish Natural Science Research Council and the Swedish Board for Technical Development.

The KOSMA radio telescope at Gornegrat-Süd Observatory is operated by the University of Köln, and supported by the Deutsches Forschungsgemeinschaft through grant SFB-301, as well as by special funding from the Land Nordrhein-Westfalen. The Observatory is administrated by the Internationale Stiftung Hochalpine Forschungstationen Jungfraujoch und Gornegrat, Bern, Switzerland.

This research was partially supported by the Hungarian Research Found (OTKA), under the number F-022566.

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© European Southern Observatory (ESO) 2000

Online publication: December 11, 2000