10. A Photometric Analysis of NSVS 896797, a W Ursae Majoris Type Star with Stellar Spots

Kyle Koeller Ball State University
Faculty Sponsor(s): Robert Berrington Ball State University
We present new differential ensemble photometry of an eclipsing binary star candidate NSVS 896797. All data was acquired using the Ball State University Observatory 20-inch telescope during February and May 2015. Then the stars brightness magnitude was compared with other stars of known brightness. I observed the variable star in three band-pass filters, Johnson B, Johnson V and Cousins R and all images were reduced using the Image Reduction and Analysis Facility (IRAF). The differential ensemble photometry was performed using AstroImageJ (AIJ). The light curves were analyzed using the Physics of Eclipsing Binaries (PHOEBE) software. Our analysis shows that the binary system is consistent with an over-contact binary in thermal contact with a surface temperature of 5110±304 K. With this model the orbital period of the star was found to be 0.31297±0.00032. An analysis of an orbital period of the system was performed using an observed minus calculated (O-C) times of minimums. We report best-fit model parameters that were determined using the PHOEBE program.
Physics & Astronomy
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Irwin Library Lower Level