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The VMC Survey - XXXV. Model fitting of LMC Cepheid light curves

Ragosta, Fabio; Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo; Cioni, Maria Rosa L; Ida Moretti, Maria; Groenewegen, Martin A T; Choudhury, Samyaday; de Grijs, Richard; Van Loon, Jacco Th; Oliveira, Joana M; Ivanov, Valentin D; Gonzalez-Fernandez, Carlos

The VMC Survey - XXXV. Model fitting of LMC Cepheid light curves Thumbnail


Authors

Fabio Ragosta

Marcella Marconi

Roberto Molinaro

Vincenzo Ripepi

Maria Rosa L Cioni

Maria Ida Moretti

Martin A T Groenewegen

Samyaday Choudhury

Richard de Grijs

Valentin D Ivanov

Carlos Gonzalez-Fernandez



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 database and near–infrared photometry obtained by the European Southern Observatory 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 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.

Journal Article Type Article
Acceptance Date Oct 8, 2019
Online Publication Date Oct 14, 2019
Publication Date 2019-12
Publicly Available Date May 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 490
Issue 4
Pages 4975-4984
DOI https://doi.org/10.1093/mnras/stz2881
Keywords stars: variables: Cepheids – stars: oscillations – galaxies: MagellanicClouds – galaxies: structure
Publisher URL http://doi.org/10.1093/mnras/stz2881

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