Large Magellanic Cloud Bump Cepheids: Probing the Stellar Mass‐Luminosity Relation

We present the results of non-linear pulsation modelling of 20 bump Cepheidsin the LMC. By obtaining a optimal fit to the observed V,R MACHO lightcurves wehave placed tight constraints on stellar parameters of M, L, Teff and well asquantities of distance modulus and reddening. We describe the mass-luminosityrelation for core-He burning for intermediate mass stars. The mass-luminosityrelation depends critically on the level of mixing within the stellar interiorover the course of the main-sequence lifetime. Our sample is significantly moreluminous than predicted by classical stellar evolutionary models that do notincorporate extension to the convective core. Under the paradigm of convectivecore overshoot our data implies $\Lambda_c$ of 0.65$\pm0.03l/H_p$. We derive aLMC distance modulus of 18.55$\pm$0.02.Comment: 23 pages, 5 figures, ApJ accepte