2 MASS，Tycho-2，XPM和UCAC3星表中的次矮星和白矮星
Subdwarfs and white dwarfs from the 2MASS, Tycho-2, XPM and UCAC3 catalogues
摘要：
利用2 MASS、UCAC 3和SuperCosmos星表的测光资料，结合Tycho-2、XPM和UCAC 3星表的自行资料，对34颗白矮星、1996颗演化和7769颗未演化的次矮星进行了全天空的R9 - 17星等候选观测。由于详细分析了不同纬度不同颜色指数（CI）与约化自行（RPM）图中恒星的分布，特别注意估计样本中的混合物，并使用蒙特卡罗模拟，因此将样本与混合物小于10%的主序列分离。结果表明，XPM和UCAC 3具有相同水平的自行精度。大多数恒星至少有6个波段的测光精度优于0.2。多色测光使我们能够消除一些混合物，并揭示一些二进制。根据依巴谷星的绝对星等与CI和RPM的关系，我们得到了依巴谷星的光度距离和三维分布。虽然XPM和UCAC 3数据的选择方法和不均匀分布提供了显着的偏差，但还是得出了初步的结论。由于古尔德带和银道面的灭绝，亚矮星在银河系中心半球有一定的集中度，并有空隙。在天空的几个地方可以看到一些尚未解释的超密度的进化亚矮星。计算了183颗具有径向速度的恒星的三维运动和银河系轨道。对56颗不同来源的Fe/H值的恒星，我们得到了金属丰度与CI、非对称漂移速度和轨道偏心率的关系。结果表明，大多数未演化的次矮星属于晕，其标度高度为$8\pm1$ kpc，晕次矮星的局部质量密度为$2\cdot10^{-5} M\sun pc^{-3}$。大多数演化的次矮星属于厚盘，其尺度高度为$1.25\pm0.1$ kpc。所选恒星的主要参数被编入新的SDWD星表，以供今后的研究。这些恒星的光谱观测值得特别注意，因为53%的选定的白矮星，94%的演化和98%的未演化的亚矮星，现在是第一次分类，而现有的光谱分类在许多情况下是错误的。
英文摘要：
The photometry from 2MASS, UCAC3 and SuperCosmos catalogues together with the proper motions from the Tycho-2, XPM and UCAC3 catalogues are used to select the all-sky samples of 34 white dwarfs, 1996 evolved and 7769 unevolved subdwarfs candidates for R from 9 to 17 magnitude. The samples are separated from the main sequence with admixture less than 10% owing to the detailed analysis of the distribution of the stars in the different color index (CI) vs. reduced proper motion (RPM) diagrams for various latitudes with special attention to the estimation of admixtures in the samples and with Monte-Carlo simulation. It is shown that the XPM and UCAC3 have the same level of proper motion accuracy. Most of the selected stars has at least 6-band photometry with accuracy is proved to be better than 0.2. The multi-color photometry allows us to eliminate some admixtures and reveal some binaries. The empirical calibrations of absolute magnitude versus CI and RPM for Hipparcos stars give us photometric distances and 3D distribution for all the stars. Although the selection method and uneven distribution of the XPM and UCAC3 data provide noticeable biases the preliminary conclusions are made. The subdwarfs show some concentration to the galactic centre hemisphere with voids because of extinction in the Gould belt and galactic plane. Some yet unexplained overdensities of the evolved subdwarfs are seen in several parts of the sky. For 183 stars with radial velocities 3D motion and galactic orbits are calculated. For 56 stars with Fe/H collected from various sources we find the relations of the metallicity with CI, asymmetric drift velocity and orbital eccentricity. It is shown that most unevolved subdwarfs belong to the halo with the scale height of $8\pm1$ kpc and local mass density of halo subdwarfs of $2\cdot10^{-5} M\sun pc^{-3}$. Most evolved subdwarfs belong to the thick disk with the scale height of $1.25\pm0.1$ kpc. Main parameters of the selected stars are compiled into new SDWD catalogue for future investigations. Special attention should be paid to spectroscopic observations of these stars because 53% of the selected white dwarfs, 94% of evolved and 98% of unevolved subdwarfs are now classified for the first time whereas the existed spectral classification is wrong in many cases.
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