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arXiv 1302.0858astro-ph.SR
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开普勒观测到的13000颗红巨星中恒星星族的星震分类

Asteroseismic classification of stellar populations among 13000 red giants observed by Kepler

D. Stello, D. Huber, T. R. Bedding, O. Benomar, L. Bildsten, Y. P. Elsworth, R. L. Gilliland, B. Mosser, B. Paxton, T. R. White

摘要:

在开普勒任务追踪的15万多个目标中,约有10%被选为红巨星。由于它们的高科学价值,特别是对星系人口研究和恒星结构和演化的研究,它们的开普勒光变曲线于2011年底公布。这些恒星中有超过13000颗(超过85%)表现出由类似太阳的振荡引起的内在通量变化,这使得它们成为大规模星震调查的理想选择。我们自动提取了各个频率,并测量了几乎每个红巨星的偶极模式的周期间隔。这些测量自然地将恒星分为不同的族群,例如红巨星分支,低质量(M/Msol < 1.8)氦核心燃烧的红团,以及高质量(M/Msol > 1.8)的次级团。周期间隔也表明,很大一部分的恒星显示旋转引起的频率分裂。这一恒星样本无疑将为研究开普勒场方向的恒星星族提供极其宝贵的资料,特别是当与补充光谱调查相结合时。

英文摘要:

Of the more than 150000 targets followed by the Kepler Mission, about 10% were selected as red giants. Due to their high scientific value, in particular for Galaxy population studies and stellar structure and evolution, their Kepler light curves were made public in late 2011. More than 13000 (over 85%) of these stars show intrinsic flux variability caused by solar-like oscillations making them ideal for large scale asteroseismic investigations. We automatically extracted individual frequencies and measured the period spacings of the dipole modes in nearly every red giant. These measurements naturally classify the stars into various populations, such as the red giant branch, the low-mass (M/Msol < 1.8) helium-core-burning red clump, and the higher-mass (M/Msol > 1.8) secondary clump. The period spacings also reveal that a large fraction of the stars show rotationally induced frequency splittings. This sample of stars will undoubtedly provide an extremely valuable source for studying the stellar population in the direction of the Kepler field, in particular when combined with complementary spectroscopic surveys.

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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