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Revisiting the Cygnus OB associations

Published online by Cambridge University Press:  29 August 2024

Alexis L. Quintana Open the ORCID record for Alexis L. Quintana [Opens in a new window]  and
Nicholas J. Wright
Alexis L. Quintana*
Affiliation:
Astrophysics Group, Keele University, Keele ST5 5BG, UK
Nicholas J. Wright
Affiliation:
Astrophysics Group, Keele University, Keele ST5 5BG, UK
*
email: a.l.p.quintana.isasi@keele.ac.uk
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Abstract

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We have studied the validity of the historical Cygnus OB associations and have found that many do not show the kinematic coherence expected for true OB associations. We have revisited these groups by photometrically identifying thousands of OB stars across the region with an SED fitting process which combines photometry, astrometry, spectral and evolutionary models. We applied a flexible clustering method and identified seven kinematically-coherent new OB associations. We observe a distinct correlation between position and velocity for two sets of these associations that suggests an expansion pattern. Tracing the motion of the stars back in the past we find that the sets were at their closest around 7.9 and 8.5 Myr ago. We discuss whether this expansion is a natural by-product of the commonly observed size - velocity dispersion relation of molecular clouds, or requires feedback to initiate the dispersal.

Keywords

stars: early-type(Galaxy:) open clusters and associations: generalGalaxy: kinematics and dynamics
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 119 - 121
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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