Fundamental parameters of 6 southern galactic open clusters determined by means of integrated spectroscopy

A.V. AHUMADA; J.J. CLARIÁ; E. BICA; D.B. PAVANI; M.C. PARISI; T. PALMA

Malargue (Mendoza)

Congreso; 50º Reunión Anual de la Asociación Argentina de Astronomía; 2007

We present flux-calibrated integrated spectra for 6 small angular diameter Galactic open clusters: Ruprecht 158, BH 92, BH 121, Collinder 258, ESO 065-SC07 and Pismis 23. The spectra were obtained at CASLEO (San Juan, Argentina) in the range 3800-6800 A. Two out of the 6 studied clusters (ESO 065-SC07 and BH 92) had not been the subject of previous studies so that the fundamental parameters determined in the current work turn out to be the first of their kind. For the remainig four clusters we provide  independent information of that derived from colour-magnitude diagram studies. Using the equivalent widths of the Balmer lines and comparing the cluster spectra with solar-metallicity template spectra of Galactic star clusters with known properties, we derive both foreground E(B-V) colour excesses and ages for the whole sample. The age and reddening distributions of the present cluster sample match those of open clusters with known parameters in a 80º sector centered at l = 300º.