NGC\,2587: a sparse open cluster embeded in a populous star field

PIATTI, ANDRÉS E.; CLARIA OLMEDO, JUAN JOSÉ; AHUMADA, A.V.

Proc. IAU Symp. "Star Clusters - Basic Galactic Building Blocks throughout Time and Space"

Cambridge Univ Press

Año: 2010 vol. 266 p. 504 - 507

1743–9213

            We present CCD BV IKC photometry in the field of the open cluster NGC 2587.We developed a new method to clean statistically the colour–magnitude diagrams. NGC 2587is found to be slightly younger than the Hyades and probably of solar metallicity. From 18probable members with measured proper motions, we derived the following mean cluster values:μα = −4.3 ± 3.6 mas yr−1 and μδ = −2.5 ± 3.4 mas yr−1 . Colour excesses, E(B − V ) = 0.10 andE(V − I) = 0.15 mag, and a heliocentric distance of 3.7 ± 0.7 kpc are obtained. The interstellarextinction in the cluster direction is found to follow the normal reddening law.