The luminosity distribution of RSGs to test their mass-loss rate

The red supergiant phase is an important phase of the evolution of massive star, as it mostly determines its final stages. One of the most important driver of the evolution during this phase is mass loss. However, the mass-loss rates prescription used for red supergiants in current stellar evolution models are still very inaccurate.In this talk, I will discuss how varying the mass-loss rate during the RSG phase modifies the populations of red supergiants. Indeed, varying the mass-loss rate makes the star evolves for some time in yellow/blue regions of the HRD, modifying the number of RSGs in some luminosity ranges. I will show how the luminosity distribution of RSGs is modified for various mass-loss prescriptions, and finally, discuss the possibility to use this distribution to constrain the mass-loss rate of RSGs by comparing with the observed one.