Jeffries, RD and Maxted, PFL and 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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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.
|Uncontrolled Keywords:||stars: low-mass brown dwarfs, stars: 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|
|Date Deposited:||19 May 2015 09:10|
|Last Modified:||25 May 2016 11:25|
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