Optical and near-infrared photometric study of the open cluster NGC 637 and 957

Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/4014

Title:	Optical and near-infrared photometric study of the open cluster NGC 637 and 957
Authors:	Yadav, R. K. S Kumar, B Subramaniam, A Sagar, R Mathew, B
Keywords:	stars: emission-line, Be Hertzsprung–Russell (HR) diagram stars: luminosity function, mass function ISM: dust, extinction Galaxy: open cluster and associations: individual: NGC 637 and NGC 957
Issue Date:	Nov-2008
Publisher:	Royal Astronomical Society
Citation:	Monthly Notices of the Royal Astronomical Society, Vol. 390, No. 3, pp. 985 - 996
Abstract:	We present UBVRI CCD photometry in the region of the open clusters NGC 637 and 957. The radii are found to be 4.2 and 4.3 arcmin. Their reddenings E(B - V) are 0.64 +/- 0.05 and 0.71 +/- 0.05 mag and their distances, from main-sequence fitting are 2.5 +/- 0.2 and 2.2 +/- 0.2 kpc. Comparison with Z = 0.02 isochrones leads to an age of 10 +/- 5 Myr for both clusters. Combining our photometry with Two Micron All Sky Survey (2MASS) JHK shows the reddening law in these directions to be normal. Mass function slopes of x = 1.65 +/- 0.20 and 1.31 +/- 0.50 are derived for the clusters, both of which are found to be dynamically relaxed. Spectral and photometric characteristics of three Be stars, two in NGC 957 and one (newly discovered) in NGC 637, indicate them to be of Classical Be type.
URI:	http://hdl.handle.net/2248/4014
ISSN:	0035-8711
Appears in Collections:	IIAP Publications Publications based on data from IAO, Hanle

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