The stellar association around Gamma Velorum and its relationship with Vela OB2

  title={The stellar association around Gamma Velorum and its relationship with Vela OB2},
  author={R D Jeffries and Tim Naylor and Frederick M. Walter and Monica Pozzo and Cambridge University and University of Exeter and Suny and Stony Brook and University College and London},
  journal={Monthly Notices of the Royal Astronomical Society},
We present the results of a photometric BVI survey of 0.9 deg 2 around the Wolf-Rayet binary γ 2 Vel and its early-type common proper motion companion γ 1 Vel (together referred to as the y Vel system). Several hundred pre-main-sequence (PMS) stars are identified and the youth of a subset of these is spectroscopically confirmed by the presence of lithium in their atmospheres, Ha emission and high levels of X-ray activity. We show that the PMS stars are kinematically coherent and spatially… 
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