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IC 2602: a lithium depletion boundary age and new candidate low-mass stellar members

Citation

Dobbie, PD and Lodieu, N and Sharp, RG, IC 2602: a lithium depletion boundary age and new candidate low-mass stellar members, Monthly Notices of the Royal Astronomical Society, 409, (3) pp. 1002-1012. ISSN 0035-8711 (2010) [Refereed Article]

Copyright Statement

Copyright 2010 The Authors. Journal compilation Copyright  2010 RAS.

DOI: doi:10.1111/j.1365-2966.2010.17355.x

Abstract

We report the results from a photometric and spectroscopic survey of ∼1.4 deg2 of the young open cluster IC 2602. Fourteen objects have been identified as having magnitudes, spectral types and radial velocities consistent with being probable or possible low-mass stellar members of the cluster. We have used the observed location of the lithium depletion boundary in the sequence defined by these objects to place a new and improved constraint on the cluster age, τ = 46+6−5 Myr. This new determination is larger by a factor ∼1.3–1.8 than the majority of age estimates which have been obtained using the main-sequence turn-off or pre-main-sequence isochrone techniques. It is thus consistent with the trend indicated by the results of similar studies on other young open clusters. Based on this new age, we set a lower limit on the cluster mass function over the range M = 0.054 − 0.24 M⊙, dn/dM > 46 M−1. If the mass function of IC 2602 has a form similar to that of other young clusters and associations then future wide, deep surveys can expect to unearth at least a handful of brown dwarfs which could potentially serve as benchmark objects.

Item Details

Item Type:Refereed Article
Keywords:techniques: photometric; brown dwarfs; stars: low-mass; open clusters and associations: individual: IC 2602
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Stellar Astronomy and Planetary Systems
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:81004
Year Published:2010
Web of Science® Times Cited:15
Deposited By:Mathematics and Physics
Deposited On:2012-11-20
Last Modified:2013-06-27
Downloads:0

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