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The velocity structure of Cygnus OB2

Arnold, Becky; Goodwin, Simon P.; Wright, Nicholas J.

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Authors

Becky Arnold

Simon P. Goodwin



Abstract

The kinematic structure of the Cygnus OB2 association is investigated. No evidence of expansion or contraction is found at any scale within the region. Stars that are within $\sim$ 0.5 parsecs of one another are found to have more similar velocities than would be expected by random chance, and so it is concluded that velocity substructure exists on these scales. At larger scales velocity substructure is not found. We suggest that bound substructures exist on scales of $\sim$ 0.5 parsecs, despite the region as a whole being unbound. We further suggest that any velocity substructure that existed on scales > 0.5 parsecs has been erased. The results of this study are then compared to those of other kinematic studies of Cygnus OB2.

Journal Article Type Article
Acceptance Date May 14, 2020
Online Publication Date May 21, 2020
Publication Date 2020-07
Publicly Available Date May 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 495
Issue 3
Pages 3474-3481
DOI https://doi.org/10.1093/mnras/staa1403
Keywords stars: kinematics and dynamics, open clusters and associations: generalstars: formation
Publisher URL http://dx.doi.org/10.1093/mnras/staa1403

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