日内瓦-哥本哈根太阳邻域巡天III。改善距离、年龄和运动学
The Geneva-Copenhagen Survey of the Solar neighbourhood III. Improved distances, ages, and kinematics
摘要：
太阳附近恒星的年龄、化学成分、速度矢量和银河系轨道是星系演化模型的基本检验数据。我们的目标是通过实施最近修订的依巴谷海平面图来提高日内瓦-哥本哈根调查数据的准确性。新的天体测量仪改进了GCS中12，506颗恒星的天体测量距离。我们还检查了GCS II量表的T_eff和[Fe/H]，发现没有必要改变。引入新的距离，我们重新计算了16,086颗恒星的M_V，以及13,520颗恒星的U，V，W和银河系轨道参数。我们还使用新的M_V值从GCS I-II中使用的Padova恒星演化模型中重新计算了恒星年龄，并将它们与Yale-Yonsei模型和Yaka-Regina模型的年龄进行了比较。最后，我们比较观察到的年龄-速度关系在W与三个模拟磁盘加热的情况下，显示数据的潜力。通过这些修订，GCS恒星的基本数据现在应该尽可能可靠。进一步的改进必须等待由角直径和通量的T_eff标度以及盖亚三角松弛的合并。我们讨论的条件，以提高计算恒星年龄从新的输入数据，并区分不同的磁盘加热的情况下，从数据集的大小和精度的GCS。
英文摘要：
Ages, chemical compositions, velocity vectors, and Galactic orbits for stars in the solar neighbourhood are fundamental test data for models of Galactic evolution. We aim to improve the accuracy of the Geneva-Copenhagen Survey data by implementing the recent revision of the Hipparcos parallaxes. The new parallaxes yield improved astrometric distances for 12,506 stars in the GCS. We also check the GCS II scales of T_eff and [Fe/H] and find no need for change. Introducing the new distances, we recompute M_V for 16,086 stars, and U, V, W, and Galactic orbital parameters for the 13,520 stars that also have radial-velocity measurements. We also recompute stellar ages from the Padova stellar evolution models used in GCS I-II, using the new values of M_V, and compare them with ages from the Yale-Yonsei and Victoria-Regina models. Finally, we compare the observed age-velocity relation in W with three simulated disk heating scenarios to show the potential of the data. With these revisions, the basic data for the GCS stars should now be as reliable as is possible with existing techniques. Further improvement must await consolidation of the T_eff scale from angular diameters and fluxes, and the Gaia trigonometric parallaxes. We discuss the conditions for improving computed stellar ages from new input data, and for distinguishing different disk heating scenarios from data sets of the size and precision of the GCS.
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