Abstract
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 data base and near-infrared photometry obtained by the European Southern Observatory public survey 'VISTA near-infrared survey of the Magellanic Clouds system'. Iso-periodic non-linear convective model sequences have been computed for each selected Cepheid in order to reproduce the multifilter light-curve amplitudes and shape details. The inferred individual distances provide an intrinsic weighted mean value for the LMC distance modulus of μ0 = 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 predictions of the canonical evolutionary mass-luminosity relation, suggesting a significant efficiency of non-canonical phenomena, such as overshooting, mass-loss, and/or rotation.
Original language | English |
---|---|
Pages (from-to) | 4975-4984 |
Number of pages | 10 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 490 |
Issue number | 4 |
DOIs | |
Publication status | Published - Dec 2019 |
Keywords
- stars: oscillations
- stars: variables: Cepheids
- Magellanic Clouds
- galaxies: structure