带有WIRE卫星的振荡K巨星：它们的星震质量的测定
Oscillating K giants with the WIRE satellite: determination of their asteroseismic masses
摘要：
K巨星的质量估计通常很不确定。传统上，单场星的质量是通过比较它们在赫罗图中的位置和恒星演化模型来确定的。因此，应用一种额外的方法来确定质量对于理解恒星演化具有重要意义。本文给出了WIRE卫星最近观测到的11K巨星的时间序列分析。有了这个全面的样本，我们报告的第一个确认，特征的声学频率，nu_max，可以预测的K巨星从太阳声截止频率的缩放。我们还能够利用我们的nu_max的测量值来确定每个恒星的星震质量，与传统方法相比，对于我们样本中的大多数恒星，不确定性较低。这表明我们的方法的应用前景良好的大量数据，将很快来自COROT和开普勒空间任务。
英文摘要：
Mass estimates of K giants are generally very uncertain. Traditionally, stellar masses of single field stars are determined by comparing their location in the Hertzsprung-Russell diagram with stellar evolutionary models. Applying an additional method to determine the mass is therefore of significant interest for understanding stellar evolution. We present the time series analysis of 11 K giants recently observed with the WIRE satellite. With this comprehensive sample, we report the first confirmation that the characteristic acoustic frequency, nu_max, can be predicted for K giants by scaling from the solar acoustic cut-off frequency. We are further able to utilize our measurements of nu_max to determine an asteroseismic mass for each star with a lower uncertainty compared to the traditional method, for most stars in our sample. This indicates good prospects for the application of our method on the vast amounts of data that will soon come from the COROT and Kepler space missions.
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