标题： 日震学和太阳年龄 显示英文标题

标题： Helioseismology and the solar age

摘要： 通过日震学方法测量太阳年龄的问题最近由Guenther & Demarque (1997)和Weiss & Schlattl (1998)重新研究过。 这两项工作得出了不同的$t_{\rm seis}$最佳值以及对不确定性的不同评估。 我们表明，根据地震数据的使用方式，可以得到$t_{\rm seis}\approx 4.6$吉年，接近最古老的陨石年龄$t_{\rm met}=4.57$吉年，如第一篇论文所示，或者高于5吉年，如第二篇论文所示。 通过假设比标准金属丰度更高和/或对太阳辐射区的不透明度进行上调，可以消除地震估计的太阳年龄差异。我们认为，最准确且稳健的太阳年龄地震测量是小频率间隔$D_{\ell,n}=\nu_{l,n}-\nu_{\ell+1,n-1}$，对于球谐度$\ell=0,2$和径向阶数$n\gg\ell$。通过最小化模型与太阳小间隔之间平方差之和得出的地震年龄是$t_{\rm seis}=4.66\pm0.11$，这一数值与陨石数据一致。我们的分析支持了早期关于使用小频率间隔作为恒星年龄指示器的建议。 显示英文摘要

摘要： The problem of measuring the solar age by means of helioseismology hasbeen recently revisited by Guenther & Demarque (1997) and by Weiss & Schlattl (1998). Different best values for $t_{\rm seis}$ and different assessment of the uncertainty resulted from these two works. We show that depending on the way seismic data are used, one may obtain the value $t_{\rm seis}\approx 4.6$ Gy, close to the age of the oldest meteorites, $t_{\rm met}=4.57$ Gy, like in the first paper, or above 5 Gy like in the second paper. The discrepancy in the seismic estimates of the solar age may be eliminated by assuming higher than the standard metal abundance and/or an upward revision of the opacities in the solar radiative interior.We argue that the most accurate and robust seismic measure of the solar age are the small frequency separations, $D_{\ell,n}=\nu_{l,n}-\nu_{\ell+1,n-1}$, for spherical harmonic degrees $\ell=0,2$ and radial orders $n\gg\ell$.The seismic age inferred by minimization of the sum of squared differences between the model and the solar small separations is $t_{\rm seis}=4.66\pm0.11$, a number consistent with meteoritic data.Our analysis supports earlier suggestions of using small frequency separations as stellar age indicators.