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The Zeta Herculis binary system revisited. Calibration and seismology

机译:重新审视了Zeta Herculis二元系统。校准和地震学

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摘要

We have revisited the calibration of the visual binary system Zeta Herculiswith the goal to give the seismological properties of the G0 IV sub-giant ZetaHer A. We have used the most recent physical and observational data. For theage we have obtained 3387 Myr, for the masses respectively 1.45 and 0.98 solarmass, for the initial helium mass fraction 0.243, for the initial mass ratio ofheavy elements to hydrogen 0.0269 and for the mixing-length parametersrespectively 0.92 and 0.90 using the Canuto & Mazitelli (1991, 1992) convectiontheory. Our results do not exclude that Zeta Her A is itself a binarysub-system; the mass of the hypothetical unseen companion would be smaller than0.05 solar mass. The adiabatic oscillation spectrum of Zeta Her A is found tobe a complicated superposition of acoustic and gravity modes; some of them havea dual character. This greatly complicates the classification of the non-radialmodes. The echelle diagram used by the observers to extract the frequencieswill work for ell=0, 2, 3. The large difference is found to be of the order of42 mu Hz, in agreement with the Martic et al. (2001) seismic observations.
机译:我们已经重新考虑了视觉二元系统Zeta Herculis的校准,目的是给出G0 IV次巨人ZetaHer A的地震特性。我们使用了最新的物理和观测数据。对于用量,我们使用Canuto&Mazitelli获得了3387 Myr,分别为1.45和0.98太阳质量,初始氦质量分数0.243,重元素与氢的初始质量比0.0269和混合长度参数分别为0.92和0.90。 (1991,1992)对流理论。我们的结果并不排除Zeta Her A本身是一个二进制子系统。假设的看不见的同伴的质量将小于0.05太阳质量。发现Zeta Her A的绝热振荡谱是声和重力模的复杂叠加。其中一些具有双重特征。这极大地使非径向模式的分类复杂化。观察者用来提取频率的echelle图将适用于ell = 0、2、3。与Martic等人的观点一致,发现较大的差异约为42μHz。 (2001)地震观测。

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