NGC2587: a sparse open cluster projected on to a populous star field

Details NGC2587: a sparse open cluster projected on to a populous star field NGC2587: a sparse open cluster projected on to a populous star field

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.397.1073p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 397, Issue 2, pp. 1073-1083.

Astronomy and Astrophysics

Astronomy

4

Techniques: Photometric, Galaxy: Open Clusters And Associations: General, Galaxy: Open Clusters And Associations: Individual: (Ngc2587)

Scientific paper

We present CCD photometry in the Johnson U, B and V and Kron-Cousins I passbands for the open cluster NGC2587. The sample consists of 4406 stars reaching down to V ~ 21.0. We developed a new method to clean statistically the colour-magnitude diagrams. NGC2587 appears to be a sparse, relatively bright open cluster, with a few tens of members projected on to a populous star field. The comparatively bright F7/8 II type star HD70927, located close to the cluster centre, seems not to be a member. Our analysis suggests that NGC2587 is slightly younger than the Hyades and probably of solar metallicity. A cluster radius of roughly 8 arcmin was estimated from the radial stellar density profile. From 18 probable cluster members with measured proper motions, we derive the following mean values for NGC2587: μα = -4.3 +/- 3.6masyr-1 and μδ = -2.5 +/- 3.4masyr-1. Adopting the theoretical metal content Z = 0.02, which provides the best global fit, we derive a cluster age of 500+60-50. Simultaneously, colour excesses E(B - V) = 0.10 and E(V - I) = 0.15 and an apparent distance modulus of V - MV = 12.50 are obtained. The interstellar extinction in the cluster direction is found to follow the normal law. NGC2587 is located at a distance of (2.70 +/- 0.70) kpc from the Sun and ~9.8 kpc from the Galactic centre.

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