This research has made use of the Simbad database, operated at CDS, Strasbourg, France. We thank M. Gelbman and U. Heiter for providing us with CCD frames for two open clusters. T. Arentoft received support from the ANTENA program, a EU Human Mobility and Capability network. The IAC, Tenerife, granted observing time to M. Viskum and T. Arentoft, and M. Viskum introduced T. Arentoft to CCD photometry at the telescope. T.A. acknowledges financial support from the Belgian Fund for Scientific Research (FWO) under contract number G.0265.97. N. Douglas kindly read and corrected the article to improve the presentation.
© European Southern Observatory (ESO) 1998
Online publication: April 20, 1998