Oscillation Frequencies and Mode Lifetimes in α Centauri A
Oscillation Frequencies and Mode Lifetimes in α Centauri A
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DOI：
10.1086/423484
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发表时间：
2004-06
期刊：
影响因子：
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通讯作者：
T. Bedding;H. Kjeldsen;R. P. Butler;Chris McCarthy;Geoffrey W Marcy;S. O’Toole;C. Tinney;Jason T. Wright
中科院分区：
文献类型：
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作者：
T. Bedding;H. Kjeldsen;R. P. Butler;Chris McCarthy;Geoffrey W Marcy;S. O’Toole;C. Tinney;Jason T. Wright
我们分析了我们最近发表的α Cen A的速度测量结果。在逐夜调整权重以优化窗函数以使旁瓣最小化之后，我们提取了l = 0-3的42个振荡频率，并测量了大小频率间隔。我们给这些频率的拟合关系，可以与理论模型进行比较，并得出结论，观察到的分散这些适合是由于有限的寿命的振荡模式。我们估计模式寿命为1-2天，大大短于太阳。
We analyze our recently published velocity measurements of α Cen A. After adjusting the weights on a night-by-night basis in order to optimize the window function to minimize sidelobes, we extract 42 oscillation frequencies with l = 0-3 and measure the large and small frequency separations. We give fitted relations to these frequencies that can be compared with theoretical models and conclude that the observed scatter about these fits is due to the finite lifetimes of the oscillation modes. We estimate the mode lifetimes to be 1-2 days, substantially shorter than in the Sun.