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Astron. Astrophys. 341, 487-490 (1999) AcknowledgementsWe thank the referee, M. Boïr, for his useful suggestions on this paper. AJCT is grateful to E. Hopp for the hospitality at the ESO hearquaters in Garching. JG also thanks to S. Tritton for the facilities given at the Royal Observatory of Edimburgh. We are also indebted to H. MacGillivray for scanning the UKSTU plates on SuperCOSMOS. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: December 4, 1998 ![]() |