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Kinematic structure in the young σ Orionis association

Jeffries, R.D.; Maxted, P.F.L.; Oliveira, J.M.; Naylor, Tim

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Authors

Tim Naylor



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.

Journal Article Type Article
Acceptance Date May 23, 2006
Online Publication Date Sep 1, 2006
Publication Date 2006-09
Publicly Available Date May 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 371
Issue 1
Pages L6 - L10
DOI https://doi.org/10.1111/j.1745-3933.2006.00196.x
Keywords stars, low-mass brown dwarfs, pre-main-sequence, open clusters and associations, individual, s Orionis
Publisher URL http://dx.doi.org/10.1111/j.1745-3933.2006.00196.x

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