Red supergiants and stellar evolution

@article{Ekstrom2013RedSA,
  title={Red supergiants and stellar evolution},
  author={S Ekstrom and Cyril Georgy and Georges Meynet and Jose H. Groh and A. Granada},
  journal={Eas Publications Series},
  year={2013},
  volume={60},
  pages={31-41}
}
We review the significant role played by red supergiants (RSGs) in stellar populations, and some challenges and questions they raise for theoretical stellar evolution. We present how metallicity and rotation modify the way stars go to the red part of the Hertzsprung-Russell diagram or come back from it, and how RSGs might keep a trace of their main-sequence evolution. We compare theoretical population ratios with observed ones. 
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