Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 371, Issue 1, Pages L6-L10Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2006.00196.x
Keywords
stars : low-mass, brown dwarfs; stars : pre-main-sequence; open clusters and associations : individual : sigma Orionis
Categories
Funding
- STFC [PP/D000955/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/D000955/1] Funding Source: researchfish
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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(-1) 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.
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