Joseph J Armstrong
The low mass population of the Vela OB2 association from Gaia
Armstrong, Joseph J; Jeffries, Robin D; Wright, Nicholas J
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.
Citation
Armstrong, J. J., Jeffries, R. D., & Wright, N. J. (2018). The low mass population of the Vela OB2 association from Gaia. Monthly Notices of the Royal Astronomical Society: Letters, 480(1), L121–L125. https://doi.org/10.1093/mnrasl/sly137
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 27, 2018 |
Online Publication Date | Jul 27, 2018 |
Publication Date | 2018-10 |
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 |
Files
20180808_sly137.pdf
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