An Analysis of the Historically Observed Period Change of UV Piscium, RT Andromedae, and XY Ursae Majoris Using a Markov Chain Monte Carlo Approach
RS CVn type binaries
Markov Chain Monte Carlo
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Astronomy Honors Theses; 2020
RT And, UV Psc, and XY UMa, all RS CVn type binaries, all have century long observational histories. All three stars have observed period change and the long span of data can shed light on the mechanisms responsible for this change. However, technological developments in observational methods have resulted in large heteroscedastic errors in the observational data. As a result, previous studies have largely ignored the photographic observations in the record. For the case of UV Psc, it is revealed, using a Markov Chain Monte Carlo Approach, that the photographic data narrows the possible period change model solutions. With the addition of the photographic data, angular momentum loss is concluded to not be the dominate mechanism of period change in UV Psc. A sinusoidal variation, whether due to a third body or the Applegate mechanism, is a more likely explanation.
Academic Major: Astronomy and Astrophysics