The VMC Survey - XXXV. Model fitting of LMC Cepheid light curves
In: Monthly Notices of the Royal Astronomical Society; (2019-12-01)
Online
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Zugriff:
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.
Comment: 14 pages, 10 figures, MNRAS accepted
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The VMC Survey - XXXV. Model fitting of LMC Cepheid light curves
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Autor/in / Beteiligte Person: | Marconi, Marcella ; Choudhury, Samyaday ; Ripepi, Vincenzo ; Cioni, Maria-Rosa L. ; Ivanov, Valentin D. ; Ragosta, F. ; Jacco Th. van Loon ; Groenewegen, Martin ; González-Fernández, Carlos ; Oliveira, Joana M. ; Richard de Grijs ; Molinaro, Roberto ; Moretti, M. I. |
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Quelle: | Monthly Notices of the Royal Astronomical Society; (2019-12-01) |
Veröffentlichung: | Oxford University Press, 2019 |
Medientyp: | unknown |
ISSN: | 0035-8711 (print) |
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