arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.1896astro-ph.SR
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由CoRoT观测到的类太阳振荡的振幅和寿命 * 红巨星与主序星

Amplitudes and lifetimes of solar-like oscillations observed by CoRoT* Red-giant versus main-sequence stars

F. Baudin, C. Barban, K. Belkacem, S. Hekker, T. Morel, R. Samadi, O. Benomar, M. -J. Goupil, F. Carrier, J. Ballot, S. Deheuvels, J. De Ridder, A. P. Hatzes, T… 展开作者

F. Baudin, C. Barban, K. Belkacem, S. Hekker, T. Morel, R. Samadi, O. Benomar, M. -J. Goupil, F. Carrier, J. Ballot, S. Deheuvels, J. De Ridder, A. P. Hatzes, T. Kallinger, W. W. Weiss

摘要:

上下文提供测光数据的CoRoT或开普勒等空间飞行任务的出现,为H-R图上的星震学带来了新的可能性。现在,在许多恒星中,包括红巨星和主序星,都可以观察到类似太阳的振荡。目标。基于数百个已识别的脉动红巨星,我们的目标是表征它们的振荡幅度和宽度。这些观测值与主序星进行比较,以测试主序星和红巨星的这些参数的趋势和标度律。方法.一个自动化的拟合程序被用来分析几百个傅立叶光谱。对于每一个明星,一个模拟的光谱拟合到所观察到的振荡光谱,并导出模式参数。结果估计了红巨星类太阳振荡的振幅和宽度,并给出了几百种振荡模式。振幅相对较高(几百ppm),宽度相对较小(只有十分之几μHz)。结论.在主序星中测量的宽度显示出与红巨星不同的有效温度变化。一个单一的标度律推导出红巨星和主序星的模式振幅与它们的光度质量比。然而,我们的研究结果表明,两种制度也可能是兼容的意见。

英文摘要:

Context. The advent of space-borne missions such as CoRoT or Kepler providing photometric data has brought new possibilities for asteroseismology across the H-R diagram. Solar-like oscillations are now observed in many stars, including red giants and main- sequence stars. Aims. Based on several hundred identified pulsating red giants, we aim to characterize their oscillation amplitudes and widths. These observables are compared with those of main-sequence stars in order to test trends and scaling laws for these parameters for both main-sequence stars and red giants. Methods. An automated fitting procedure is used to analyze several hundred Fourier spectra. For each star, a modeled spectrum is fitted to the observed oscillation spectrum, and mode parameters are derived. Results. Amplitudes and widths of red-giant solar-like oscillations are estimated for several hundred modes of oscillation. Amplitudes are relatively high (several hundred ppm) and widths relatively small (very few tenths of a μHz). Conclusions. Widths measured in main-sequence stars show a different variation with the effective temperature than red giants. A single scaling law is derived for mode amplitudes of both red giants and main-sequence stars versus their luminosity to mass ratio. However, our results suggest that two regimes may also be compatible with the observations.

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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