![]() | ![]() |
Astron. Astrophys. 332, 1055-1063 (1998) AcknowledgementsThis work was supported by grants from CONACYT and DGAPA (UNAM). S.A. acknowledges support from a DGAPA(UNAM) fellowship. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: March 30, 1998 ![]() |