Bringing VY Canis Majoris Down to Size: An Improved Determination of Its Effective Temperature

  title={Bringing VY Canis Majoris Down to Size: An Improved Determination of Its Effective Temperature},
  author={Philip Massey and Emily M. Levesque and Bertrand Plez},
  journal={The Astrophysical Journal},
  pages={1203 - 1208}
The star VY CMa is a late-type M supergiant with many peculiarities, mostly related to the intense circumstellar environment due to the star's high mass-loss rate. Claims have been made that would imply that this star is considerably more luminous (L ~ 5 × 105 L☉) and larger (R ~ 2800 R☉) than other Galactic red supergiants (RSGs). Indeed, such a location in the H-R diagram would be well within the "Hayashi forbidden zone," where stars cannot be in hydrostatic equilibrium. These extraordinary… 


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