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Astron. Astrophys. 321, 145-150 (1997) AcknowledgementsWe acknowledge A. Arellano Ferro, P.Morel, and the staff of San Pedro Martir Observatory (Mexico). This work is part of a continuing program between Nice Observatory (OCA, Fresnel Department), the Instituto de Astronomia (U.N.A.M, Mexico), the CONACYT (Mexico) and the Meudon Observatory. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: June 30, 1998 ![]() |