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arXiv 1008.2630astro-ph.SR
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类太阳辐射器星核的地震特征:与质量和年龄的关系

Seismic signatures of stellar cores of solar-like pulsators: dependence on mass and age

I. M. Brandão, M. S. Cunha, O. L. Creevey, J. Christensen-Dalsgaard

摘要:

恒星振荡器内层的有用信息可以从研究它们的振荡中得到。在本文中,我们分析了三个诊断工具建议在文献中建立的振荡频率计算的一组主序列模型之间的质量$1.0\, {\rm M}_{\odot}$和$1.6\, {\rm M}_{\odot}$,检查他们可能持有的信息恒星的核心。对于模型与对流核心($M \geq 1.2\,{\rm M}_{\odot}$),我们发现之间的关系的诊断工具的频率斜率和在核心的边缘处的声速跳跃的大小。我们表明,这种关系是独立的模型的质量。在实践中,由于声速跳跃的大小与恒星的年龄有关,使用这些地震工具,我们原则上可以推断恒星的演化状态。我们还表明,当结合研究的三个诊断工具中的两个时,我们能够区分具有对流核心的模型与没有对流核心但在内层具有强声速梯度的模型。

英文摘要:

Useful information from the inner layers of stellar pulsators may be derived from the study of their oscillations. In this paper we analyse three diagnostic tools suggested in the literature built from the oscillation frequencies computed for a set of main sequence models with masses between $1.0\, {\rm M}_{\odot}$ and $1.6\, {\rm M}_{\odot}$, to check what information they may hold about stellar cores. For the models with convective cores ($M \geq 1.2\,{\rm M}_{\odot}$) we find a relation between the frequency slopes of the diagnostic tools and the size of the jump in the sound speed at the edge of the core. We show that this relation is independent of the mass of the models. In practice, since the size of the jump in the sound speed is related to the age of the star, using these seismic tools we may, in principle, infer the star's evolutionary state. We also show that when combining two of the three diagnostic tools studied, we are able to distinguish models with convective cores from models without a convective core but with strong sound-speed gradients in the inner layers.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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