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2001•Bulletin of the Astronomical Society of IndiaRequires access

A deep V I CCD photometric study of the neglected galactic star cluster NGC 6631

R. Sagar, B. N. Naidu, V. Mohan

Open publisher page 2 citations

Abstract

We present the VI CCD photometric observations of about 5500 stars up to a limiting magnitude of V ~20 in an area of ~16' × 16' around the cluster NGC 6631. The cluster parameters determined for the first time by fitting the theoretical isochrones in the V, (V - I) diagram of the cluster stars are E (V - I) = 0.60 ± 0.05 mag, distance = 2.6 ± 0.5 kpc, age = 400 ± 100 Myr and metallicity, Z = 0.05. The cluster diameter determined from the radial density profile is 4.8 ± 0.5 pc. The mass function of the cluster has a slope of 2.1 ± 0.5.

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What this paper is about

We present the VI CCD photometric observations of about 5500 stars up to a limiting magnitude of V ~20 in an area of ~16' × 16' around the cluster NGC 6631. The cluster parameters determined for the first time by fitting the theoretical isochrones in the V, (V - I) diagram of the cluster stars are E (V - I) = 0.60 ± 0.05 mag, distance = 2.6 ± 0.5 kpc, age = 400 ± 100 Myr and metallicity, Z = 0.05. The cluster diameter determined from the radial density profile is 4.8 ± 0.5 pc. The mass function of the cluster has a slope of 2.1 ± 0.5.

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Available abstract

We present the VI CCD photometric observations of about 5500 stars up to a limiting magnitude of V ~20 in an area of ~16' × 16' around the cluster NGC 6631. The cluster parameters determined for the first time by fitting the theoretical isochrones in the V, (V - I) diagram of the cluster stars are E (V - I) = 0.60 ± 0.05 mag, distance = 2.6 ± 0.5 kpc, age = 400 ± 100 Myr and metallicity, Z = 0.05. The cluster diameter determined from the radial density profile is 4.8 ± 0.5 pc. The mass function of the cluster has a slope of 2.1 ± 0.5.

Key concepts: Physics, Astrophysics, Metallicity, Stars, Cluster (spacecraft), Open cluster, Star count, Star cluster

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