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Astron. Astrophys. 318, 797-804 (1997) AcknowledgementsWe would like to thank Prof. T.G. Barnes for having provided us with his data in computer form. We thank also Dr. Giuseppe Bono for a critical reading of the manuscript. D. Welch's Cepheid database at McMaster University was used. This research also makes use of SIMBAD database at CDS (Strasbourg). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: July 3, 1998 ![]() |