Research at Armagh Observatory is grant aided by the Dept. of Education for N. Ireland. We also acknowledge the computer support by the STARLINK project funded by the UK PPARC. We would like to thank the support staff of the WHT (La Palma) for helpful assistance during the observations. This research has, in part, made use of the Simbad database, operated at CDS, Strasbourg, France. AGG would like to thank Armagh Observatory for a research scholarship during the period of this work.
© European Southern Observatory (ESO) 1997
Online publication: July 8, 1998