English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a detailed light curve analysis of RR Lyrae variables at multiplewavelengths using Fourier decomposition method. The time-series data for RRLyrae variables in the Galactic bulge and the Magellanic Clouds are taken fromthe Optical Gravitational Lensing Experiment survey while the infrared lightcurves are compiled from the literature. We also analyse the multibandtheoretical light curves that are generated from the stellar pulsation modelsof RR Lyrae stars for a wide range of metal-abundances. We find that thetheoretical light curve parameters with different metal abundances areconsistent with observed parameters in most period bins at both optical andinfrared wavelengths. The theoretical and observed Fourier amplitude parametersdecrease with increase in wavelength while the Fourier phase parametersincrease with wavelength at a given period. We use absolute magnitudes for asubset of theoretical models that fit the observed optical RR Lyrae lightcurves in the Large Magellanic Cloud to estimate a distance modulus,$\mu_\textrm{LMC}=18.51\pm0.07$, independent of the metallicity. We also useFourier analysis to study the period-color and amplitude-color relations for RRLyrae stars in the Magellanic Clouds using optical data and find that the slopeof period-color relation at minimum light is very shallow or flat and becomesincreasingly significant at the maximum light for RRab stars. We also find thatthe metallicity dependence of the period-color relations increases as we gofrom minimum to maximum light, suggesting that the mean light results areindeed an average of the various pulsational phases. We summarize that theaverage variation in these relations is consistent between theory andobservations and supports the theory of the interaction of the stellarphotosphere and the hydrogen ionization front.

On the variation of light curve parameters of RR Lyrae variables at multiple wavelengths