Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001basi...29..519s&link_type=abstract
Bulletin of the Astronomical Society of India, Vol. 29, p. 519-530
Astronomy and Astrophysics
Astronomy
4
Photometry, Cluster Ngc 6631, Colour-Magnitude Diagram
Scientific paper
We present the V I CCD photometric observations of about 5500 stars up to a limiting magnitude of V ~ 20 in an area of ~ 16? x 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.
Mohan Vijay
Nagaraja Naidu B.
Sagar Ram
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