Multiwavelength light curve parameters of Cepheid variables

Anupam Bhardwaj, Shashi M. Kanbur, Marcella Marconi, Marina Rejkuba, Harinder P. Singh, Chow Choong Ngeow

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

We present a comparative analysis of theoretical and observed light curves of Cepheid variables using Fourier decomposition. The theoretical light curves at multiple wavelengths are generated using stellar pulsation models for chemical compositions representative of Cepheids in the Galaxy and Magellanic Clouds. The observed light curves at optical (VI), near-infrared (JHKs) and mid-infrared (3.6 & 4.5-μm) bands are compiled from the literature. We discuss the variation of light curve parameters as a function of period, wavelength and metallicity. Theoretical and observed Fourier amplitude parameters decrease with increase in wavelength while the phase parameters increase with wavelength. We find that theoretical amplitude parameters obtained using canonical mass-luminosity levels exhibit a greater offset with respect to observations when compared to non-canonical relations. We also discuss the impact of variation in convective efficiency on the light curve structure of Cepheid variables. The increase in mixing length parameter results in a zero-point offset in bolometric mean magnitudes and reduces the systematic large difference in theoretical amplitudes with respect to observations.

Original languageEnglish
Title of host publicationWide-Field Variability Surveys
Subtitle of host publicationA 21st Century Perspective - 22nd Los Alamos Stellar Pulsation - Conference Series Meeting
EditorsWolfgang Gieren, Marcio Catelan, Wolfgang Gieren, Marcio Catelan
PublisherEDP Sciences
ISBN (Electronic)9782759890248
DOIs
StatePublished - 8 Sep 2017
Event22nd Los Alamos Stellar Pulsation Conference Series Meeting 2016 - San Pedro de Atacama, Chile
Duration: 28 Nov 20162 Dec 2016

Publication series

NameEPJ Web of Conferences
Volume152
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X

Conference

Conference22nd Los Alamos Stellar Pulsation Conference Series Meeting 2016
Country/TerritoryChile
CitySan Pedro de Atacama
Period28/11/162/12/16

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