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The low mass population of the Vela OB2 association from Gaia

Armstrong, Joseph J; Jeffries, Robin D; Wright, Nicholas J

The low mass population of the Vela OB2 association from Gaia Thumbnail


Authors

Joseph J Armstrong



Abstract

The first Gaia Data Release presents an opportunity to characterise the low-mass population of OB associations, providing larger statistical samples and better constraints on the formation and evolution of clusters and associations. Using previously known low mass members in a small region of Vela OB2 we have designed selection criteria that combine Gaia and 2MASS photometry, independently of any astrometric information, to identify low-mass pre-main-sequence (PMS) stars over the wider association area. Our method picks out the known clusters of young stars around Velorum and NGC-2547, but also identifies other over-densities that may represent previously unknown clusters. There are clear differences in the spatial distributions of the low-mass and the high-mass OB populations, suggesting either that the structure and dynamics of these populations has evolved separately or that the initial mass function can vary considerably on small scales within a single association.

Journal Article Type Article
Acceptance Date Jul 27, 2018
Online Publication Date Jul 27, 2018
Publication Date 2018-10
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society: Letters
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 480
Issue 1
Article Number sly137
Pages L121–L125
DOI https://doi.org/10.1093/mnrasl/sly137
Keywords surveys, Gaia, 2MASS, techniques, photometric, methods, data analysis, OB associations, Vela OB2
Publisher URL http://dx.doi.org/10.1093/mnrasl/sly137

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