The age distribution of stars in the immediate solar environment

利用我们位于墨西哥瓜纳华托的TIGRE望远镜，我们已经开始了一项系统的工作，以确定在直接的太阳环境中类太阳恒星的自转速度和年龄的分布。场星的年龄测定是出了名的困难，监测CaII H&K谱线的核心辐射是为数不多的确定活动水平较低的类日恒星自转速度的方法之一。从2013年开始，我们已经开始--使用TIGRE--监测附近近100颗明亮的类太阳恒星；在一个给定的观测季节内，我们通常获得每个天体40个光谱，即每个观测季节大约有4000个光谱可供分析。在这项资金申请的背景下，我们建议对现有数据以及未来几个季节将要获取的数据进行彻底分析。特别是，将以严格的方式调查系统效应和误差。利用得到的自转周期，我们可以对我们的样本恒星进行回转年代学。无论是利用现有的数据，还是利用TIGRE光谱得到的数据，都将得到样本恒星的有效温度和化学丰度；此外，我们还将得出所有样本恒星的S指数和锂当量宽度，从而可以通过回转年代学、演化轨迹上的等时线放置以及活动指标和锂强度来综合评估样本恒星的年龄。

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.