Discovery of a detached HI gas shell surrounding alpha Orionis

  title={Discovery of a detached HI gas shell surrounding alpha Orionis},
  author={Thibaut Le Bertre and Lynn D. Matthews and Eric G'erard and Yannick Libert},
  journal={arXiv: Solar and Stellar Astrophysics},
We report the detection of the HI line at 21 cm in the direction of alpha Ori with the Nancay Radiotelescope and with the Very Large Array. The observations confirm the previous detection of HI emission centered on alpha Ori, but additionally reveal for the first time a quasi-stationary detached shell of neutral atomic hydrogen ~4 arcmin. in diameter (0.24 pc at a distance of 200 pc). The detached shell appears elongated in a direction opposite to the star's space motion. A simple model shows… 
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