On the presence and absence of disks around O-type stars

  title={On the presence and absence of disks around O-type stars},
  author={Jorick S. Vink and Ben Davies and Tim J. Harries and Rene Dick Oudmaijer and Nolan R. Walborn},
  journal={Astronomy and Astrophysics},
Context. As the favoured progenitors of long-duration gamma-ray bursts, massive stars may represent our best signposts of individual objects in the early Universe, but special conditions seem required to make these bursters. These are thought to originate from the progenitor’s rapid rotation and associated asymmetry. Aims. To obtain empirical constraints on the interplay between stellar rotation and wind asymmetry, we perform linear Hα spectropolarimetry on a sample of 18 spectroscopically… 

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