通过g模探测对流核的性质：SPB和γ Doradus星中的高阶g模
Probing the properties of convective cores through g modes: high-order g modes in SPB and gamma Doradus stars
摘要：
在主序星的高阶重力模式的周期是敏感的探针的恒星核心，特别是，化学成分梯度，发展的外缘附近的对流核心。我们提出了一个分析近似的高阶g模式，考虑到附近的核心亩梯度的效果。我们发现，在主序模型中，类似于白矮星的情况下，高阶重力模式的周期精确地描述了一个均匀的周期间隔叠加到振荡分量。这种分量的周期性和幅度分别与μ梯度的位置和锐度有关。我们研究了质量域为1 ~ 10 Msun的恒星模型的高阶引力模的性质，以及恒星质量、演化状态和额外混合过程对周期间隔特征的影响。特别是，我们表明，一个典型的SPB星的模型，化学混合，可能会引起在这些恒星中观察到的缓慢旋转，是能够显着改变的g-模式的平衡模型的光谱。还讨论了剑鱼座γ星和SPB星的星震学的前景和挑战。
英文摘要：
In main sequence stars the periods of high-order gravity modes are sensitive probes of stellar cores and, in particular, of the chemical composition gradient that develops near the outer edge of the convective core. We present an analytical approximation of high-order g modes that takes into account the effect of the mu gradient near the core. 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 component are related, respectively, to the location and sharpness of the mu gradient. We investigate the properties of high-order gravity modes for stellar models in a mass domain between 1 and 10 Msun, and the effects of the stellar mass, evolutionary state, and extra-mixing processes on period spacing features. In particular, we show that for models of a typical SPB star, a chemical mixing that could likely be induced by the slow rotation observed in these stars, is able to significantly change the g-mode spectra of the equilibrium model. Prospects and challenges for the asteroseismology of gamma Doradus and SPB stars are also discussed.
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