Estudio espectral integrado de agregados estelares galácticos altamente enrojecidos

BICA, EDUARDO; CLARIA OLMEDO, JUAN JOSÉ; PIATTI, ANDRÉS E.; BONETTO, CARLOS ALBERTO

La Plata

Congreso; Reunión Anual de la Asoc. Argentina de Astronomía; 1998

Integrated spectra in the range 6700-9500Å for 20 Galactic globular clusters (and candidates) in the bulge and 5 others projected on the Galactic disk (|l|>30o and |b|<5o) are presented. Most of them are considerably reddened and are among those least studied in the literature. We derive reddening and metallicity from flux-calibrated spectra, thus providing independent information of that derived from colour-magnitude studies. For some clusters in the sample, these parameters have been determined for the first time, and for others a considerable revision is given. We indicate the globular clusters which definitely belong to the bulge metal-rich and intermediate metallicity families. Among the objects projected on the disk, we find that the integrated spectral properties of LyngÅ 7, BH 176 and Palomar 10 are compatible with those of metal-rich globular clusters. Finally, ESO 93-SC08 is an old open cluster, and UKS 2 an open cluster with age ≈ 1 Gyr.