Armstrong, JJ, Wright, NJ ORCID: 0000-0002-8389-8711 and Jeffries, RD (2018) The low mass population of the Vela OB2 association from Gaia. Monthly Notices of the Royal Astronomical Society: Letters. sly137 - sly137. ISSN 1745-3933

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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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: surveys, Gaia, 2MASS, techniques, photometric, methods, data analysis, OB associations, Vela OB2
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 08 Aug 2018 09:18
Last Modified: 08 Aug 2018 09:20
URI: http://eprints.keele.ac.uk/id/eprint/5207

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