El Cúmulo Abierto NGC 6167 en la Asociación Ara OB1

FOLATELLI, GASTÓN; MORRELL, N. I.; BARBÁ, R. H.

Rosario

Conferencia; 43 Reunión Anual de la Asociación Argentina de Astronomía; 1999

We have carried out a spectrophotometric study of the central region of the open cluster NGC 6167. We were motivated to do so by the fact that this cluster could have had a main role in the star formation history of Ara OB1 Association (Arnal et al., 1987, A&A 174, 78), though it had not been thoroughly studied. Particularly, there was no previous research based on CCD data, and even the existence of the cluster itself had been discussed by some authors. By means of CCD photometry and intermediate resolution spectroscopy on images obtained at the Complejo Astronómico El Leoncito (CASLEO, San Juan) we have obtained B and V magnitudes down to V=19 in the central region of the cluster, along with spectral types and radial velocities for 85 stars. This information allowed us to determine for NGC 6167 a distance modulus of 10.5 ± 0.3 and a mean radial velocity of -39 ± 14 km s-1, which are in agreement with the values corresponding to the open cluster NGC 6193 and with the Ara OB1 Association as a whole. We discuss the role of NGC 6167 in the context of Ara OB1.