A [ITAL]Hipparcos[/ITAL] Census of the Nearby OB Associations

  title={A [ITAL]Hipparcos[/ITAL] Census of the Nearby OB Associations},
  author={P. T. de Zeeuw and Ronnie Hoogerwerf and Jos H.J. de Bruijne and A.G.A. Brown and A. Blaauw Sterrewacht Leiden and Leiden and Instituto de Astronomia U.N.A.M. and Ensenada and Mexico. and Kapteyn Astronomical Institute and Groningen},
  journal={The Astronomical Journal},
A comprehensive census of the stellar content of the OB associations within 1 kpc from the Sun is presented, based on Hipparcos positions, proper motions, and parallaxes. It is a key part of a long-term project to study the formation, structure, and evolution of nearby young stellar groups and related star-forming regions. OB associations are unbound moving groups, which can be detected kinematically because of their small internal velocity dispersion. The nearby associations have a large… Expand
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