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Jeffries, RD, Maxted, PFL, Oliveira, JM and Naylor, T (2006) Kinematic structure in the young Sigma Orionis association. Monthly Notices of the Royal Astronomical Society, 371 (1). L6 - L10. ISSN 1365-2966

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Abstract

We have used precise radial velocity measurements for a large number of candidate low-mass stars and brown dwarfs, to show that the young Sigma Ori ``cluster'' consists of two spatially superimposed components which are kinematically separated by 7 km/s in radial velocity, and which have different mean ages. We examine the relationship of these two kinematic groups to other populations in the Orion OB1 association and briefly discuss the consequence of mixed age samples for ongoing investigations of the formation and evolution of low-mass objects in this much-observed region.

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: stars, low-mass brown dwarfs, pre-main-sequence, open clusters and associations, individual, σ 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 09:10
Last Modified: 19 Oct 2017 13:56
URI: https://eprints.keele.ac.uk/id/eprint/526

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