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Gravity modes and mixed modes as probes of stellar cores in main-sequence stars: From solar-like to beta Cep stars

机译:重力模式和混合模式作为主序恒星中恒星核的探测:从太阳型恒星到βCep恒星

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We investigate how the frequencies of gravity modes depend on the detailed properties of the chemical composition gradient that develops near the core of main-sequence stars and, therefore, on the transport processes that are able to modify the mu profile in the central regions. We show that in main-sequence models, similarly to the case of white dwarfs, the periods of high-order gravity modes are accurately described by a uniform period spacing superposed to an oscillatory component. The periodicity and amplitude of such a component are related, respectively, to the location and sharpness of the mu gradient. We briefly discuss and interpret, by means of this simple approximation, the effect of turbulent mixing near the core on the periods of both high-order and low-order g modes, as well as of modes of mixed pressure-gravity character. (C) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
机译:我们研究了重力模式的频率如何取决于在主要序列恒星的核心附近发展的化学成分梯度的详细属性,并因此取决于能够改变中央区域mu剖面的传输过程。我们表明,在主序列模型中,类似于白矮星的情况,高阶重力模式的周期由叠加到振荡分量上的均匀周期间隔精确描述。这种分量的周期性和幅度分别与μ梯度的位置和清晰度有关。通过这种简单的近似,我们简短地讨论和解释湍流混合在核心附近对高阶和低阶g模态以及混合压力重力特性的周期的影响。 (C)2008 WILEY-VCH Verlag GmbH&Co.KGaA,Weinheim。

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