Cold gas in hot star clusters: the wind from the red supergiant W26 in Westerlund 1

  title={Cold gas in hot star clusters: the wind from the red supergiant W26 in Westerlund 1},
  author={Jonathan Mackey and Norberto Castro and Luca Fossati and Norbert Langer},
  journal={arXiv: Astrophysics of Galaxies},
The massive red supergiant (RSG) W26 in Westerlund 1 is one of a growing number of RSGs shown to have winds that are ionized from the outside in. The fate of this dense wind material is important for models of second generation star formation in massive star clusters. Mackey et al. (2014) showed that external photoionization can stall the wind of RSGs and accumulate mass in a dense static shell. We use 1D R-HD simulations of an externally photoionized wind to predict the Halpha and [NII… 

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