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

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.

Citation

Ragosta, F., Marconi, M., Molinaro, R., Ripepi, V., Cioni, M. R. L., Ida Moretti, M., …Gonzalez-Fernandez, C. (2019). The VMC Survey - XXXV. Model fitting of LMC Cepheid light curves. Monthly Notices of the Royal Astronomical Society, 490(4), 4975-4984. https://doi.org/10.1093/mnras/stz2881

• 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