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Analysis of the kinematic structure of the Cygnus OB1 associatio

AuthorsCostado, M. T. ; Alfaro, Emilio J. ; González García, Marta ; Sampedro, Laura
KeywordsTechniques: radial velocities
Stars: formation
Stars: kinematics and dynamics
Open clusters and associations: general
Issue Date17-Nov-2016
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 465(4): 3879-3888 (2017)
AbstractThe main objective of this study is the characterization of the velocity field in the Cygnus OB1 association using the radial velocity data currently available in the literature. This association is part of a larger star-forming complex located in the direction of the Cygnus region, but whose main subsystems may be distributed at different distances from the sun. We have collected radial velocity data for more than 300 stars in the area of 5 × 5 deg2 centred on the Cygnus OB1 association. We present the results of a kinematic clustering analysis in the subspace of the phase space formed by angular coordinates and radial velocity using two independent methodologies. We have found evidence of structure in the phase space with the detection of two main groups, corresponding to different radial velocity and distance values, belonging to the association, and associated with two main shells defined by the Hα emission. A third grouping well separated from the other two in velocity appears to occupy the whole region associated with what has been called ‘common shell’.© 2016 The Authors.
Publisher version (URL)http://dx.doi.org/10.1093/mnras/stw2967
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