This work was supported by Austrian Science Fund Project S7308 and Hungarian OTKA Grants T022259 and F022249. This research made use of the SIMBAD database operated by CDS in Strasbourg, France. In this research, we have used, and acknowledge with thanks, data from the AAVSO International Database, based on observations submitted to the AAVSO by variable star observers worldwide. We also thank similar computer services maintained by the extremely enthusiastic staff of the AFOEV and VSOLJ.
© European Southern Observatory (ESO) 2000
Online publication: September 5, 2000