Discovery of a Short Period Pulsator from Istanbul University Observatory

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SAĞLAM M. T., ÇÖRDÜK M., ALİŞ S., ÖZGÜL G., ÖZGÜLLÜ O., GÖKTÜRK F. E., ...Daha Fazla

Turkish Journal of Astronomy and Astrophysics, cilt.3, sa.1, ss.8-16, 2022 (Hakemli Dergi)

• Yayın Türü: Makale / Tam Makale
• Cilt numarası: 3 Sayı: 1
• Basım Tarihi: 2022
• Doi Numarası: 10.55064/tjaa.1103590
• Dergi Adı: Turkish Journal of Astronomy and Astrophysics
• Sayfa Sayıları: ss.8-16
• Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
• İstanbul Üniversitesi Adresli: Evet

Özet

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" >P∼0.95$\mathrm{}$ 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" >(B−V)0${}_{\mathrm{}}$ of the star determined as 2.76" role="presentation" >2.76$\mathrm{}$ and 0.22" role="presentation" >0.22$\mathrm{}$, respectively. This (B−V)0" role="presentation" >(B−V)0${}_{\mathrm{}}$ 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%.