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A kinematically hot population of young stars in the solar neighbourhood

Binks, AS; Wright, Nicholas; Jeffries, Robin

A kinematically hot population of young stars in the solar neighbourhood Thumbnail


Authors

AS Binks



Abstract

In the last three decades several hundred nearby members of young stellar moving groups (MGs) have been identified, but there has been less systematic effort to quantify or characterise young stars that do not belong to previously identified MGs. Using a kinematically unbiased sample of 225 lithium-rich stars within 100 pc, we find that only $50 \pm 10$ per cent of young ($\lesssim 125$ Myr), low-mass ($0.5<M/M_{\odot}<1.0$) stars, are kinematically associated with known MGs. Whilst we find some evidence that six of the non-MG stars may be connected with the Lower Centaurus-Crux association, the rest form a kinematically "hotter" population, much more broadly dispersed in velocity, and with no obvious concentrations in space. The mass distributions of the MG members and non-MG stars is similar, but the non-MG stars may be older on average. We briefly discuss several explanations for the origin of the non-MG population.

Journal Article Type Article
Acceptance Date Mar 28, 2020
Online Publication Date Apr 7, 2020
Publication Date 2020-05
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 494
Issue 2
Pages 2429-2439
DOI https://doi.org/10.1093/mnras/staa909
Keywords stars: kinematics and dynamics, stars: late-type, stars: pre-main-sequence, solar neighbourhood
Publisher URL https://doi.org/10.1093/mnras/staa909

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