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  • 标题:The Pre-He White Dwarfs in Eclipsing Binaries. II. WASP 0843–11
  • 本地全文:下载
  • 作者:Kyeongsoo Hong ; Jae Woo Lee ; Jae-Rim Koo
  • 期刊名称:The Astronomical journal
  • 印刷版ISSN:0004-6256
  • 电子版ISSN:1538-3881
  • 出版年度:2021
  • 卷号:161
  • 期号:3
  • 页码:1-9
  • DOI:10.3847/1538-3881/abdd39
  • 语种:English
  • 出版社:American Institute of Physics
  • 摘要:We present the Transiting Exoplanet Survey Satellite (TESS) photometry and our high-resolution spectra of the EL CVn–type star 1SWASP J084356.46–113327.5 (WASP 0843–11), which consists of an F-type main-sequence (MS) star and a hotter low-mass helium white dwarf precursor (pre-He WD). In a spectral analysis, double-lined radial velocities (RVs) were obtained for the first time. From a simultaneous analysis of the TESS light and RV curves, the masses, radii, and temperatures of each component were determined to be M1 = 1.733 ± 0.031 M⊙, M2 = 0.220 ± 0.008 M⊙, R1 = 2.094 ± 0.013 R⊙, R2 = 0.331 ± 0.003 R⊙, T1 = 6960 ± 120 K, and T2 =9870 ± 310 K, respectively. According to their physical properties, the primary and secondary stars are located on the instability strips of δ Sct/γ Dor hybrids and extremely low-mass WDs, respectively. We applied multiple frequency analyses to the residual light curve after subtracting the binarity effects and detected a total of four independent frequencies. A frequency of f3 = 1.6356 day−1 in the low-frequency region was reminiscent of γ Dor stars, while the other three frequencies of f2, f15, and f18 in the high-frequency region (150–196 day−1) are probably related to pre-He WD components. Our results demonstrate that the more massive MS primary star of WASP 0843–11 is a γ Dor pulsator, whereas the hotter secondary component is a pre-He WD with high-frequency pulsations.
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