Abstract Details
| Name: Susmita Das Affiliation: University of Delhi Conference ID: ASI2016_815 Title : Multi-wavelength Analysis of Theoretical light curves of RR Lyrae Authors and Co-Authors : Susmita Das(Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India.) Anupam Bhardwaj(Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India.) Shashi M. Kanbur (State University of New York, Oswego, NY 13126, USA.) Marcella Marconi(INAF-Osservatorio astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy) Harinder P. Singh (Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India.) Abstract Type : Poster Abstract Category : Stars, The Milky Way Galaxy and its neighbours Abstract : We present an analysis of the theoretical light curves of the fundamental and first-overtone mode RR Lyrae variables using the Fourier decomposition technique. The light curves were adopted from nonlinear, time-dependent convective hydrodynamical pulsation models of RR Lyraes for a wide range of the metal abundances (metal-poor Z=0.0001 to solar metal abundance Z=0.02) in the optical (UBVRI) and near-infrared(JKL) bands. We determined the variation of Fourier Parameters as a function of period, wavelength and metallicity. We find that Fourier amplitude parameters decrease as function of wavelength while Fourier phase parameters increase with wavelength for a given period. We observe a distinct separation in the pattern around 0.6 days in most of the Fourier parameters as a function of period at multiple wavelengths. We also analysed the Period-Color and Amplitude-Color relations for RR Lyraes as function of pulsation phase and period over different wavelength and metallicities. The P-C relation for RR Lyrae at minimum light is flat at multiple wavelengths and is consistent with observed P-C relation in Bhardwaj et al. (2014). The P-C and A-C relations also provide evidence of a linear dependence on the metal abundance and are consistent with the theoretical explanation based on the stellar photosphere and the hydrogen ionization front. |