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We present a theoretical investigation of multifilter (U,B,V, I and K) lightand radial velocity curves of five Classical Cepheids in NGC 1866, a youngmassive cluster of the Large Magellanic Cloud. The best fit models accountingfor the luminosity and radial velocity variations of the five selectedvariables, four pulsating in the fundamental mode and one in the firstovertone, provide direct estimates of their intrinsic stellar parameters andindividual distances. The resulting stellar properties indicate a slightlybrighter Mass Luminosity relation than the canonical one, possibly due to mildovershooting and/or mass loss. As for the inferred distances, the individualvalues are consistent within the uncertainties. Moreover, their weighted meanvalue corresponds to a distance modulus of 18.56 + - 0.03 (stat) + - 0.1 (syst)mag, in agreement with several independent results in the literature.

Theoretical fit of Cepheid light an radial velocity curves in the Large Magellanic Cloud cluster NGC 1866