The evolutionary status of Sher 25 – implications for blue supergiants and the progenitor of SN 1987A

  title={The evolutionary status of Sher 25 – implications for blue supergiants and the progenitor of SN 1987A},
  author={Steven J. Smartt and Daniel J. Lennon and Rolf Peter Kudritzki and F. Rosales and Robert S. I. Ryans and N. Wright},
  journal={Astronomy and Astrophysics},
The blue supergiant Sher 25 in the massive Galactic cluster NGC 3603 is surrounded by a striking emission line nebula. The nebula contains an equatorial ring and probable bi-polar outflows, and is similar in morphology, mass and kine- matics to the shell now visible around SN 1987A. It has been suggested that both nebulae were ejected while Sher 25 and the progenitor of SN 1987A were in previous red supergiant phases. In the case of Sher 25 this is based on the qualitative strengths of nebular… 

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