Discovery of a Short Period Pulsator from Istanbul University Observatory

Abstract

We report the discovery of a new short period pulsating variable in the field of exoplanet host star XO-2. Variable has been identified while it was being used as a comparison star. In order to verify the variability of the candidate, a follow-up program was carried out. Period analysis of multi-band light curves revealed a very prominent and consistent pulsation periodicity of $P\sim 0.95$ hours. Given the variability period, amplitude and the color index, the object is most likely a \emph{Delta Scuti} type variable. Absolute magnitude ($M_v$) and the color index $(B-V{)}_0$ of the star determined as $2.76$ and $0.22$, respectively. This $(B-V{)}_0$ of the star corresponds to A7 spectral type with an approximate effective temperature of 7725 K. Machine-learning analysis of the time-series data also revealed that the object is of variable type DSCT with a probability of 78\%.

6 pages, 9 figures, 4 tables, accepted for publication in the Turkish Journal of Astronomy and Astrophysics (TJAA)

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