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Determination of Substellar Mass Function of Young Open Clusters Using 2MASS and GSC Data

Published online by Cambridge University Press:  26 May 2016

Anandmayee Tej ,
Kailash C. Sahu ,
T. Chandrasekhar  and
N. M. Ashok
Anandmayee Tej
Affiliation:
Observatoire Astronomique de Strasbourg, 67000 Strasbourg, France
Kailash C. Sahu
Affiliation:
Space Telescope Science Institute, Baltimore, MD 21218, USA
T. Chandrasekhar
Affiliation:
Physical Research Laboratory, Navrangpura, Ahmedabad – 380009, India
N. M. Ashok
Affiliation:
Physical Research Laboratory, Navrangpura, Ahmedabad – 380009, India

Abstract

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We present a statistical method to derive the mass functions of open clusters using sky survey data such as the 2 Micron All Sky Survey (2MASS) and the Guide Star Catalogue (GSC). We have used this method to derive the mass functions in the stellar/substellar regime of three young, nearby open clusters, namely IC 348, σ Orionis and Pleiades. The mass function in the low mass range (M< 0.50M⊙) is appreciably flatter than the stellar Salpeter function for all three open clusters. The contribution of objects below 0.5 M⊙ to the total mass of the cluster is ~40% and the contribution of objects below 0.08 M⊙ to the total is ~4%.

Type
Part 4. Observations of Young Brown Dwarfs (age ≃ 50–200 Myr)
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 175 - 178
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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