Discovery of a Short Period Pulsator from Istanbul University Observatory


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Sağlam M. T., Çördük M., Aliş S., Özgül G., Özgüllü O., Göktürk F. E., ...More

Turkish Journal of Astronomy and Astrophysics, vol.3, no.1, pp.8-16, 2022 (Peer-Reviewed Journal)

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. In order to verify the variability of the candidate, a comprehensive follow-up was carried out. Period analysis of multi-band light curves revealed a very prominent and consistent pulsation periodicity of P∼0.95" role="presentation" >P0.95 hours. Given the variability period, amplitude and the color index, the object is most likely a \emph{delta Scuti} type variable. Absolute magnitude (Mv" role="presentation" >Mv) and the color index (B−V)0" role="presentation" >(BV)0 of the star determined as 2.76" role="presentation" >2.76 and 0.22" role="presentation" >0.22, respectively. This (B−V)0" role="presentation" >(BV)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%.