Optical photometry and CORAVEL observations of stars in the field of the Hyades-like age open cluster NGC 2489

Details Optical photometry and CORAVEL observations of stars in the field of the Hyades-like age open cluster NGC 2489 Optical photometry and CORAVEL observations of stars in the field of the Hyades-like age open cluster NGC 2489

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..35q.303p&link_type=abstract

XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (

Astronomy and Astrophysics

Astronomy

Scientific paper

We present CCD BVI photometry of 2182 stars in the field of the open cluster NGC 2489, supplemented with Coravel radial-velocity observations for 7 red giant candidates. 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-M_V=12.20+/-0.25 for log t=8.70 and Z = 0.019. NGC 2489 is then located at 1.8+/-0.3 kpc from the Sun and 25 pc below the Galactic plane. A cluster angular radius of 6.7'±0.6', equivalent to (3.5+/-0.3) pc, is estimated from star counts carried out inside and outside the cluster region. The analysis of the kinematical data allowed us to confirm cluster membership for 6 red giants, one of them being a spectroscopic binary. A mean radial velocity of 38.13+/-0.33 km s^{-1} was derived for these stars. The properties of a sample of open clusters aligned along the line-of-sight to NGC 2489 are examined (Piatti et al. 2007, MNRAS, 377, 1737).

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