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  • 标题:Absolute Properties of the Eclipsing γ Dor Star V404 Lyrae
  • 本地全文:下载
  • 作者:Jae Woo Lee ; Kyeongsoo Hong ; 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:2020
  • 卷号:159
  • 期号:1
  • 页码:336-344
  • DOI:10.3847/1538-3881/ab59ce
  • 语种:English
  • 出版社:American Institute of Physics
  • 摘要:We present the first high-resolution spectra for the eclipsing binary V404 Lyr showing γ Dor pulsations, which we use to study its absolute properties.By fitting models to the disentangling spectrum of the primary star, we found that it has an effective temperature of Teff,1 = 7330 ± 150 K and a rotational velocity of v1 sin i = 148 ± 18 km s−1.The simultaneous analysis of our double-lined radial velocities and the pulsation-subtracted Kepler data gives us accurate stellar and system parameters of V404 Lyr.The masses, radii, and luminosities are M1 = 2.17 ± 0.06 M⊙, R1 = 1.91 ± 0.02 R⊙, and L1 = 9.4 ± 0.8 L⊙ for the primary, and M2 = 1.42 ± 0.04 M⊙, R2 = 1.79 ± 0.02 R⊙, and L2 = 2.9 ± 0.2 L⊙ for the secondary.The tertiary component orbiting the eclipsing pair has a mass of M3b = 0.71 ± 0.15 M⊙ in an orbit of P3b = 642 ± 3 days, e3b = 0.21 ± 0.04, and a3b = 509 ± 2 R⊙.The third light of l3 = 4.1% ± 0.2% could be partly attributable to the K-type circumbinary object.By applying a multiple frequency analysis to the eclipse-subtracted light residuals, we detected 45 frequencies with signal-to-noise amplitude ratios larger than 4.0.Identified as independent pulsation modes, seven frequencies (f1 − f6, f9), their new pulsation constants, and the location in the Hertzsprung–Russell diagram indicate that the pulsating primary is a γ Dor-type variable star.
  • 关键词:Eclipsing binary stars;Fundamental parameters of stars;Stellar oscillations;Spectroscopy;Multi-periodic pulsation;Asteroseismology
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