Armstrong, JJ, Wright, NJ, Jeffries, RD and Jackson, RJ (2020) The dynamics of the γ Vel cluster and nearby Vela OB2 association. Monthly Notices of the Royal Astronomical Society, 494 (4). 4794 -4801. ISSN 0035-8711

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The kinematics of low-mass stars in nearby OB associations can provide clues about their origins and evolution. Combining the precise positions, proper motions, and parallaxes given in the second Gaia Data Release with radial-velocity measurements obtained with the Hermes spectrograph at the Anglo-Australian Telescope, we have an opportunity to study in detail the kinematics of low-mass stars belonging to the nearby γ Vel cluster and the Vela OB2 association it is projected against. The presence of lithium is used to confirm the youth of our targets. We separate our sample into the cluster and association populations based on the Gaia-ESO Survey membership probabilities their parallaxes, and kinematics. We find strong evidence for expansion in the OB association population with at least 4σ significance along all three axes, though the expansion is notably anisotropic. We discuss these results in the context of cluster and association dispersal theories.

Item Type: Article
Additional Information: This is the final published version (version of record). It was first published online via Oxford University Press at - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: methods: data analysis, techniques: photometric, surveys, open clusters and associations: individual: Vela OB2, γ Velorum
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB799 Stars
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 02 Jun 2020 13:45
Last Modified: 25 Jun 2020 10:14

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