http://arxiv.org/abs/1910.05052
We present the results of the light curve model fitting technique applied to optical and near-infrared photometric data for a sample of 18 Classical Cepheids (11 fundamentals and 7 first overtones) in the Large Magellanic Cloud (LMC). We use optical photometry from the OGLE III database and near–infrared photometry obtained by the European Southern bservatory public survey “VISTA near–infrared survey of the Magellanic Clouds system”. Iso–periodic nonlinear convective model sequences have been computed for each selected Cepheid in order to reproduce the multi–filter light curve amplitudes and shape details. The inferred individual distances provide an intrinsic weighted mean value for the LMC distance modulus of $\mu_0=18.56$ mag with a standard deviation of 0.13 mag. We derive also the Period–Radius, the Period–Luminosity and the Period–Wesenheit relations that are consistent with similar relations in the literature. The intrinsic masses and luminosities of the best–fitting models show that all the investigated pulsators are brighter than the redictions of the canonical evolutionary mass–luminosity relation, suggesting a significant efficiency of non–canonical phenomena, such as overshooting, mass loss and/or rotation.
F. Ragosta, M. Marconi, R. Molinaro, et. al.
Mon, 14 Oct 19
39/69
Comments: 14 pages, 10 figures, MNRAS accepted
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