KIC 10417986:Spectroscopic Confirmation of the Nature of the Binary System with aδScuti Component  

作　　者：Guo-Jie Feng Ali Esamdin Jian-Ning Fu Hu-Biao Niu Peng Zong Tao-Zhi Yang Shu-Guo Ma Jing Xu Chun-Hai Bai Yong Wang Wei-Chao Sun Xin-Liang Wang 

机构地区：[1]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumgi,Xinjang 830011,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Astronomy,Beijing Normal University,Beijing 100875,China [4]Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter,School of Physics,Xi'an Jiaotong University,710049 Xi'an,China

出　　处：《Research in Astronomy and Astrophysics》2022年第10期49-60,共12页天文和天体物理学研究（英文版）

基　　金：support from the National Natural Science Foundation of China(NSFC,Grant Nos.11403088,11873081,U2031209,11833002,12090040,12090042 and 12003020);partially supported by the Open Project Program of the Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences。

摘　　要：KIC 10417986 is a short orbital period(0.0737 day)ellipsoidal variable star with aδSct andγDor hybrid pulsation component discovered by Kepler.The ground-based spectroscopic observations were carried out in the winters of 2020 and 2021 to investigate the binary nature of this star.We derive the orbital parameters using the rvfit code with a result of K_(1)=29.7±1.5 km s^(-1),γ=-18.7±1.7 km s^(-1),and confirm an orbital period of 0.84495 day instead of the result given by Kepler.The atmospheric parameters of the primary are determined by the synthetic spectral fitting technique with the estimated values of T_(eff)=7411±187 K,log g=4.2±0.3 dex,[M/H]=0.08±0.09 dex and vsini=52±11 km s^(-1).KIC 10417986 is a circular orbit binary system.From the single-lined nature and mass function of the star,the derived orbital inclination is 26°±6°,and the mass of the secondary is 0.52_(-0.09)^(+0.18)M_(⊙),which should be a late-K to early-M type star.Fourteen frequencies are extracted from Kepler light curves,of which six independent frequencies in the high-frequency region are identified as the p-mode pulsations ofδSct star,and one independent frequency in the low-frequency region(f_(2)=1.3033 cd^(-1))is probably the rotational frequency due to the starspots rather than the ellipsoidal effect.

关 键 词：techniques spectroscopic-(stars:)binaries spectroscopic-stars individual(KIC 10417986)-stars oscillations(including pulsations)-stars variables delta Scuti-(stars:)starspots 

分 类 号：P153[天文地球—天文学]