标题： 向精确测定场星的年龄。 使用宽距双星在若干十亿年尺度上的自转年代学约束。 I. 初始样本的年龄 显示英文标题

标题： Towards precise ages for single stars in the field. Gyrochronology constraints at several Gyr using wide binaries. I. Ages for initial sample

摘要： 我们提出一个程序，用于获得太阳型矮星的年龄-旋转测量值，以用于数十亿年年龄的旋年关系校准。 这是一个参数空间的关键区域，对于银河系的大规模研究至关重要，而目前在此区域唯一可用的约束是由太阳提供的。 我们的程序利用了一组宽双星系统，其中一颗恒星是演化的恒星，另一颗是FGK型主序星。 通过这种方式，我们从演化恒星中获得系统的年龄，而主序星的旋转特性则提供了与太阳型恒星自转减慢相关的旋年关系信息。 通过挖掘目前可用的宽双星目录，我们整理了一个37对适合我们目的的样本：19对主星是离开主序或次巨星，18对主星是白矮星。 使用高分辨率光学光谱学，我们测量了15对主星为离开主序或次巨星的双星的精确恒星参数，并利用这些参数推导出相应系统的等时线年龄。 18对主星为白矮星的双星的年龄取自文献。 这个初始31对宽双星的年龄范围从1到9 Gyr，其中近一半系统的精度优于20%。 当与它们主序星成分的旋转周期测量相结合时，这些宽双星系统有望提供类似数量的点，用于非常古老年龄的旋年关系校准。 显示英文摘要

摘要： We present a program designed to obtain age-rotation measurements of solar-type dwarfs to be used in the calibration of gyrochronology relations at ages of several Gyr. This is a region of parameter space crucial for the large-scale study of the Milky Way, and where the only constraint available today is that provided by the Sun. Our program takes advantage of a set of wide binaries selected so that one component is an evolved star and the other is a main-sequence star of FGK type. In this way, we obtain the age of the system from the evolved star, while the rotational properties of the main sequence component provides the information relevant for gyrochronology regarding the spin-down of solar-type stars. By mining currently available catalogs of wide binaries, we assemble a sample of 37 pairs well positioned for our purposes: 19 with turnoff or subgiant primaries, and 18 with white dwarf components. Using high-resolution optical spectroscopy, we measure precise stellar parameters for a subset of 15 of the pairs with turnoff/subgiant components, and use these to derive isochronal ages for the corresponding systems. Ages for 16 of the 18 pairs with white dwarf components are taken from the literature. The ages of this initial sample of 31 wide binaries range from 1 to 9 Gyr, with precisions better than 20% for almost half of these systems. When combined with measurements of the rotation period of their main sequence components, these wide binary systems would potentially provide a similar number of points useful for the calibration of gyrochronology relations at very old ages.