すばるHSCによる高速固有運動の測定に基づくコンパクト天体の研究

我已经利用斯巴鲁望远镜，超最高凸轮(HSC)进行了精确的自行测量，结合斯隆数字巡天(SDSS)来探测那些微弱和高度自行运动的物体。我已经建立了一个白矮星星表，通过应用简化的自行图来区分白矮星和主序星。还采用黑体光谱拟合法对白矮星的温度进行了验证和推导，特别是那些很难用白矮星H/He模型拟合的低温白矮星，我发现了许多低于5000K的极低温白矮星候选星。它们被认为是最古老的恒星群，是我们银河系的化石。我们可以通过测量白矮星的性质来探索银河系早期的信息。此外，我们还可以完善红端的白矮星冷却模型，在白矮星星表的基础上，建立了白矮星光度函数(WDLF)，该函数是为了恢复恒星的形成历史和年龄而开发的，比如恒星爆发将在WDLF中表现为一个凸起。我们的WDLF显示出包含本征暗白矮星的可能性，这在以前的工作中从未被发现。

I have taken advantage of the Subaru Telescope, Hyper-Supreme Cam (HSC) to make precise proper motion measurements to explore those faint and high proper motion objects, combining with the Sloan Digital Sky Survey (SDSS). I have established a white dwarf catalogue by applying the reduced proper motion diagram to separate the white dwarf from the main-sequence stars. A black-body spectroscopic fitting has also been adopted to make validation and derive the temperature of white dwarfs, especially the low-temperature ones which can hardly be fitted with white dwarfs H/He models.I have find a lot of extremely low-temperature white dwarf candidates lower than 5,000K. They are supposed to be the oldest population of stars, the fossil of our Milky Way Galaxy. We can measure the property of the white dwarfs to probe the information of the early time of the Galaxy. Besides, we can perfect the white dwarf cooling model at the red end.Based on the white dwarf catalogue, I have made the white dwarf luminosity function (WDLF), which has been developed to recover the age and star formation history, such as that star burst will appear as a bump in the WDLF. Our WDLF shows a potential to include the intrinsic faint white dwarfs which has never been discovered in previous work.