Blue supergiants as tests for stellar physics

Massive star evolution is still poorly understood, and observational tests are required to discriminate between different implementations of physical phenomenon in stellar codes. By confronting models with observed properties blue supergiants, such as pulsations, chemical composition position the Hertzsprung-Russell diagram, we aim at determining which criterion used for convection (Schwarzschild or Ledoux) best able explain observations. We compute state-of-the-art either Schwarzschild Ledoux convection. Models $14$ $35\,M_\odot$ solar Large Magellanic Cloud metallicity. For each model, pulsation know when radial modes excited. then compare our results supergiants their surface composition, variability. Our metallicity shows only a slight preference over one reproducing same time even if cannot be excluded this check that changing overshoot parameter does not improve situation. also reproduce Galactic supergiant flux-weighted-gravity -- luminosity relation. confirm overall, computed slightly better matching support idea most $\alpha$ Cyg variables group 2, i.e. stars have been through previous red phase where they lost large amount mass.