太阳年龄校正进度报告
Progress report on solar age calibration
摘要：
我们报告正在进行的调查地震校准的太阳模型，旨在估计主序星年龄和太阳的化学丰度的措施。只采用低阶模，这样，经过适当的修改，该程序可以应用于其他恒星。我们已经发现，正如预期的那样，分离的贡献所产生的地震频率从相对平滑，无毛刺，背景结构的恒星和故障产生的氦电离和突然的梯度变化在对流区的基础上，使该程序比以前的校准，只适合原始频率的无毛刺渐近更强大。和过去一样，我们使用渐近分析来设计地震信号，尽我们所能，尽可能少地受到与年龄和化学成分没有直接关系的恒星不确定性质的污染。然而，校准本身仅采用数值计算的本征频率。它是基于一个参考模型的线性扰动。有两个参考模型被使用，一个比太阳稍年轻，另一个比太阳稍老。使用BiSON数据的两种校准或多或少是一致的，并产生主序列年龄$t_\odot=4.68\pm0.02 $ Gy，加上正式的初始重元素丰度$Z=0.0169\pm0.0005$。误差分析还没有完成，所以估计的精度必须有所保留。
英文摘要：
We report on an ongoing investigation into a seismic calibration of solar models designed for estimating the main-sequence age and a measure of the chemical abundances of the Sun. Only modes of low degree are employed, so that with appropriate modification the procedure could be applied to other stars. We have found that, as has been anticipated, a separation of the contributions to the seismic frequencies arising from the relatively smooth, glitch-free, background structure of the star and from glitches produced by helium ionization and the abrupt gradient change at the base of the convection zone renders the procedure more robust than earlier calibrations that fitted only raw frequencies to glitch-free asymptotics. As in the past, we use asymptotic analysis to design seismic signatures that are, to the best of our ability, contaminated as little as possible by those uncertain properties of the star that are not directly associated with age and chemical composition. The calibration itself, however, employs only numerically computed eigenfrequencies. It is based on a linear perturbation from a reference model. Two reference models have been used, one somewhat younger, the other somewhat older than the Sun. The two calibrations, which use BiSON data, are more-or-less consistent, and yield a main-sequence age $t_\odot=4.68\pm0.02 $Gy, coupled with a formal initial heavy-element abundance $Z=0.0169\pm0.0005$. The error analysis has not yet been completed, so the estimated precision must be taken with a pinch of salt.
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。
