Oliveira, JM, Jeffries, RD, Loon, JTV and Rushton, MT (2006) Circumstellar discs in the young sigma Orionis cluster. Monthly Notices of the Royal Astronomical Society, 369 (1). 272 -280. ISSN 1365-2966

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We present new K- and L'-band imaging observations for members of the young (3-5 Myr) sigma Orionis cluster, obtained with UIST at UKIRT. We determine (K-L') colour excesses with respect to the photospheres, finding evidence for warm circumstellar dust around 27 out of 83 cluster members that have masses between 0.04 Msun and 1.0 Msun. This indicates a circumstellar disc frequency of at least (33 +/- 6)% for this cluster, consistent with previous determinations from smaller samples (Oliveira et al. 2004) and also consistent with the 3 Myr disc half-life suggested by Haisch et al. (2001). There is marginal evidence that the disc frequency declines towards lower masses, but the data are also consistent with no mass-dependence at all. There is no evidence for spatial segregation of objects with and without circumstellar discs.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2006: The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: circumstellar matter, stars, low-mass, brown dwarfs, pre-main-sequence, open clusters and associations, sigma Orionis
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 19 May 2015 14:22
Last Modified: 19 Sep 2017 13:17
URI: https://eprints.keele.ac.uk/id/eprint/531

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