Gaia DR2 data for 41 stars place Cyg OB3 at about 2 kpc, give a coherent mean peculiar velocity of about 22 km/s, and support Cyg X-1 membership.
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abstract
Since the previous (1990) edition of this meeting enormous progress in the field of OB associations has been made. Data from X-ray satellites have greatly advanced the study of the low-mass stellar content of associations, while astrometric data from the Hipparcos satellite allow for a characterization of the higher-mass content of associations with unprecedented accuracy. We review recent work on the OB associations located within 1.5 kpc from the Sun, discuss the Hipparcos results at length, and point out directions for future research.
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Kinematic study of the association Cyg OB3 with Gaia DR2
Gaia DR2 data for 41 stars place Cyg OB3 at about 2 kpc, give a coherent mean peculiar velocity of about 22 km/s, and support Cyg X-1 membership.