Multicolour photometry and CORAVEL radial velocities of stars of the open cluster NGC2489

A.E. PIATTI; J.J. CLARIÁ; J.-C. MERMILLIOD; M.C. PARISI; A.V. AHUMADA

Malargüe - Argentina

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

We present CCD BVI photometry in the field of the open cluster NGC2489, supplemented with CORAVEL radial velocities (RVs) for 7 red giant candidates. A cluster angular radius of (3.5 ± 0.3) pc is estimated from star counts. The comparison of the cluster colour-magnitude diagram with isochrones of the Padova group yields E(B-V) = 0.30 ± 0.05, E(V-I) = 0.40 ± 0.05, and V-MV = 12.20 ± 0.25 for log t (age) = 8.70 and Z = 0.019. The analysis of the RVs allowed us to confirm cluster membership for 6 red giants, one of them being a spectroscopic binary. The properties of a sample of open clusters aligned along the line-of-sight to NGC2489 are examined.