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Astron. Astrophys. 343, 273-280 (1999) AcknowledgementsThe authors acknowledge use of the CCD and data acquisition system supported under U.S. national Science Foundation grant AST-90-15827 to R.M. Rich. This research has made use of the Simbad database, operated at CDS, Strasbourg, France.
© European Southern Observatory (ESO) 1999 Online publication: March 1, 1999 ![]() |