Abstract Details

Name: Richa Kundu
Affiliation: University of Delhi
Conference ID: ASI2017_615
Title : Multiphase PL-PC Relations for Cepheids
Authors and Co-Authors : Shashi Kanbur,State University of New York, Oswego, NY 13126, USA. H.P.Singh,Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India. Anupam Bhargwaj ,Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India.
Abstract Type : Poster
Abstract Category : Stars,ISM and the Galaxy
Abstract : Cepheid variables are bright, population I radial pulsators that exhibit regular light curves and obey a well known Period-Luminosity relation which is an important tool in the extra-galactic distance scale measurements. In the present work light curve analysis for Cepheids is done using the technique of Fourier decomposition. Period-Luminosity, Period-Color, Period-Wesenheit and Amplitude-Color(PL, PC, WP and AC) relations for Cepheids in LMC and SMC using OGLE-IV data for various phases of pulsation are studied in V and I band. These multiphase relations can be used in light curve modeling and can provide a better insight into the physics of Cepheids. Extrema in the relations are usually observed at phase around 0.8. Breaks in PL and PC relations at a period of 10 days for all pulsation phases are investigated using F-Test following the work of Ngeow et al. 2009. Theoretically, these breaks can be explained by the interaction of hydrogen ionization front and photosphere.