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arXiv 1107.0490astro-ph.SR
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类太阳振荡的振幅:开普勒观测到的来自疏散星团中红巨星的约束

Amplitudes of solar-like oscillations: constraints from red giants in open clusters observed by Kepler

D. Stello, D. Huber, T. Kallinger, S. Basu, B. Mosser, S. Hekker, S. Mathur, R. A. Garcia, T. R. Bedding, H. Kjeldsen, R. L. Gilliland, G. A. Verner, W. J. Chap… 展开作者

D. Stello, D. Huber, T. Kallinger, S. Basu, B. Mosser, S. Hekker, S. Mathur, R. A. Garcia, T. R. Bedding, H. Kjeldsen, R. L. Gilliland, G. A. Verner, W. J. Chaplin, O. Benomar, S. Meibom, F. Grundahl, Y. P. Elsworth, J. Molenda-Zakowicz, R. Szabó, J. Christensen-Dalsgaard, P. Tenenbaum, J. D. Twicken, K. Uddin

摘要:

将星震量与全球恒星性质联系起来的标度关系对于理解支撑恒星脉动的复杂物理学非常重要。一般认为,疏散星团中的所有恒星都具有基本相同的距离、年龄和初始成分,这意味着恒星参数的测量精度比通常对单个恒星的测量精度要高得多。这使得星团成为探索类太阳振荡模式振幅与恒星整体性质之间关系的理想工具。我们分析了NASA开普勒太空望远镜获得的数据,研究了位于NGC 6791、NGC 6819和NGC 6811这三个疏散星团中的100颗红巨星的类太阳振荡。通过拟合测量到的振幅预测从简单的标度关系,取决于光度,质量和有效温度,我们发现,数据不能描述的任何权力的光度质量比,如先前所假设的。因此,我们提供了一个新的改进的经验关系,处理光度和质量分开。这个关系式对于主序星和次巨星也非常适用。此外,测量到的振幅揭示了一些以前未知的未解决的双星在NGC 6791和NGC 6819的红团中的潜在存在,指出了一个有趣的新的应用,作为一个探测到疏散星团的形成历史的星震学。

英文摘要:

Scaling relations that link asteroseismic quantities to global stellar properties are important for gaining understanding of the intricate physics that underpins stellar pulsation. The common notion that all stars in an open cluster have essentially the same distance, age, and initial composition, implies that the stellar parameters can be measured to much higher precision than what is usually achievable for single stars. This makes clusters ideal for exploring the relation between the mode amplitude of solar-like oscillations and the global stellar properties. We have analyzed data obtained with NASA's Kepler space telescope to study solar-like oscillations in 100 red giant stars located in either of the three open clusters, NGC 6791, NGC 6819, and NGC 6811. By fitting the measured amplitudes to predictions from simple scaling relations that depend on luminosity, mass, and effective temperature, we find that the data cannot be described by any power of the luminosity-to-mass ratio as previously assumed. As a result we provide a new improved empirical relation which treats luminosity and mass separately. This relation turns out to also work remarkably well for main-sequence and subgiant stars. In addition, the measured amplitudes reveal the potential presence of a number of previously unknown unresolved binaries in the red clump in NGC 6791 and NGC 6819, pointing to an interesting new application for asteroseismology as a probe into the formation history of open clusters.

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