The age distribution of stars in the immediate solar environment

我们利用位于墨西哥瓜纳华托的TIGRE望远镜，开始了一项系统性的努力，以确定太阳环境中类太阳恒星的自转速度和年龄的分布。 确定场星的年龄是出了名的困难，而监测Ca II H&K线的核心发射是少数几种在相当低的活动水平下确定类太阳恒星旋转速率的方法之一。 从2013年开始，我们已经开始使用TIGRE监测近100颗邻近的明亮的类太阳恒星;在给定的观测季节内，我们通常会获得每个物体的40个光谱，即，每个观测季约有4000个光谱可供分析。在这项拨款申请中，我们建议对现有的数据，以及未来数季所收集的数据，进行彻底的分析。 特别是，系统的影响和错误将在一个严格的方式进行调查。 利用所得到的自转周期，我们可以对样本星进行陀螺测年。 利用已有的数据或TIGRE光谱数据，可以计算出样本星的有效温度和化学丰度，进而得到所有样本星的S指数和锂当量宽度，从而可以通过陀螺年代学、等时线在演化轨道上的位置以及活动指标和锂强度等对样本星的年龄进行综合评估。

Using our TIGRE telescope located in Guanajuato, Mexico, we have begun a systematic effort to determine the distribution of rotation velocities and ages of solar-like stars in the immediate solar environment. Age determinations for field stars are notoriously difficult and monitoring the core emission in the CaII H&K lines is one of the few methods available to determine the rotation rates of solar-like stars at rather low levels of activity. Starting in 2013, we have begun -- using TIGRE -- monitoring almost 100 nearby bright solar-like stars; within a given observing season we obtain typically 40 spectra per object, i.e., per observing season about 4000 spectra are available for analysis.In the context of this funding application we propose to carry out a thorough analysis of the existing data as well as the data to be taken in the next few seasons. In particular, systematic effects and errors will be investigated in a rigorous fashion. With the derived rotation periods we can perform gyro-chronology on our sample stars. Either with existing data or with data derivable from the TIGRE spectra the effective temperatures and chemical abundances fo the sample stars will be carried out; furthermore we will derive S-indices as well as lithium equivalent widths for all sample stars, and can thus perform a comprehensive assessment of the ages of the sample stars through gyro-chronology, isochrone placement on evolutionary tracks as well activity indicators and lithium strength.