2026-06-30 中国科学院（CAS）
＜関連情報＞
- https://english.cas.cn/newsroom/research-news/202606/t20260630_1175122.shtml
- https://iopscience.iop.org/article/10.1088/1674-4527/ae6a77
TIC 197757000: 潮汐同期を伴うδ Scuti型脈動星を含む食連星系 TIC 197757000: An Eclipsing Binary System Containing a δ Scuti-type Pulsating Star with Tidal Synchronization
Shahidin Yaqup, Ali Esamdin, Hu-Biao Niu, Antonio García Hernández, Cheng-Long lv, Deng-Kai Jiang, Guo-Jie Feng, Tao-Zhi Yang, Yong Zhao, Shu-Guo Ma,…
Research in Astronomy and Astrophysics Published: 5 June 2026
DOI:10.1088/1674-4527/ae6a77
Abstract
We present a detailed analysis of the binary modeling and pulsation properties of TIC 197757000, an eclipsing binary system hosting a δ Scuti component, based on photometric data from the Transiting Exoplanet Survey Satellite (TESS) and Photometric Auxiliary Telescope-17, and spectroscopic data from the Beijing Faint Object Spectrograph and Camera equipment of the 2.16 m telescope. The primary star temperature of 7782(150) K from spectroscopic observations is consistent with the temperature of 7895+243-271K , determined by spectral energy distribution fitting within the respective uncertainties. The Fourier transform (FT) of the TESS light curve for TIC 197757000 reveals seven independent frequencies associated with its light variations, which are detected in the typical frequency range of δ Scuti stars and identified as pressure modes. Among these, the ratios F0/F1 and F0/F2 are measured as 0.77095 and 0.62203, where F0, F1, and F2 correspond to the fundamental frequency, the first overtone, and the second overtone respectively. Furthermore, through analyses of the FT, histogram of frequency differences, autocorrelation function, and échelle diagram, a large frequency separation of Δν = 33.45 ± 0.50 μHz has been derived. The short orbital period and distinctive light curve morphology are both consistent with the properties of a tidally locked system.
