造父β星的地震学：解释波江座nu振荡谱的微分旋转模型
Seismology of beta Cephei stars: differentially-rotating models for interpreting the oscillation spectrum of nu-Eridani
摘要：
介绍了一种分析仙王座β星的星震的方法，并将其应用于波江座ν星。该方法是基于旋转分裂的分析，其不对称性使用差分旋转的小行星地震模型。质量约为7.13 M_sun，年龄约为14.9 Myr的模型被发现更适合14个观测频率中的10个，这些频率被确定为基本径向模式和三个L=1三重态g，p和p。这些模式的分裂和不对称性恢复了文献中提供的那些，除了p。所有的非轴对称分量都由模型预测。此外，观测到的和预测的分裂不对称性的相反的迹象被发现。如果确认，这可能是一个非常有趣的信息来源的内部旋转配置文件，特别是在外部地区的恒星。一般来说，地震模型，其中包括一个描述页岩旋转产生的结果略好于均匀旋转模型相比。此外，我们表明，不对称性是相当依赖于过冲的对流核心，这使得本技术适合于测试描述的角动量重新分配和化学混合由于旋转引起的湍流的理论。
英文摘要：
A method for the asteroseismic analysis of beta Cephei stars is presented and applied to the star nu Eridani. The method is based on the analysis of rotational splittings, and their asymmetries using differentially-rotating asteroseismic models. Models with masses around 7.13 M_sun, and ages around 14.9 Myr, were found to fit better 10 of the 14 observed frequencies, which were identified as the fundamental radial mode and the three L=1 triplets g, p, and p. The splittings and aymmetries found for these modes recover those provided in the literature, except for p. For this last mode, all its non-axysimmetric components are predicted by the models. Moreover, opposite signs of the observed and predicted splitting asymmetries are found. If identification is confirmed, this can be a very interesting source of information about the internal rotation profile, in particular in the outer regions of the star. In general, the seismic models which include a description for shellular rotation yield slightly better results as compared with those given by uniformly-rotating models. Furthermore, we show that asymmetries are quite dependent on the overshooting of the convective core, which make the present technique suitable for testing the theories describing the angular momentum redistribution and chemical mixing due to rotationally-induced turbulence.
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