Kinematics of solar neighborhood stars and its dependence on age and metallicity
Kinematics of solar neighborhood stars and its dependence on age and metallicity
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DOI：
10.1088/1674-4527/15/3/008
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发表时间：
2014-05
影响因子：
1.8
通讯作者：
Zongbo Huyan;Zi Zhu;Jia-cheng Liu
中科院分区：
文献类型：
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作者：
Zongbo Huyan;Zi Zhu;Jia-cheng Liu
我们已经建立了一个星表，其中包含主要是F型和G型恒星的最好的天体测量、光度学、径向速度和天体物理数据(称为与天体物理数据相关的天体测量学目录，ACAD)。它包含27553条记录，用于分析太阳附近的恒星运动学。利用Lindblad-Oort模型和编制的ACAD程序，计算了不同年龄金属丰度区的太阳运动和奥尔特常数。直接研究了运动学参数随恒星年龄和金属丰度的演化。结果表明，太阳在银河系自转方向的运动分量(记为S_2)随年龄呈线性增加，这可能是散射过程的结果，动力学冷盘的S_2值为8.0±1.2 km S−1.S_2也随金属丰度线性增加，表明径向迁移与金属丰度梯度有关.另一方面，太阳绕银河系中心的自转速度与估算中使用的恒星的年龄或金属含量没有明显的相关性。
We have constructed a catalog containing the best available astrometric, photometric, radial velocity and astrophysical data for mainly F-type and G-type stars (called the Astrometric Catalog associated with Astrophysical Data, ACAD). This contains 27 553 records and is used for the purpose of analyzing stellar kinematics in the solar neighborhood. Using the Lindblad-Oort model and compiled ACAD, we calculated the solar motion and Oort constants in different age-metallicity bins. The evolution of kinematical parameters with stellar age and metallicity was investigated directly. The results show that the component of the solar motion in the direction of Galactic rotation (denoted S2) linearly increases with age, which may be a consequence of the scattering processes, and its value for a dynamical cold disk was found to be 8.0 ± 1.2 km s−1. S2 also linearly increases with metallicity, which indicates that radial migration is correlated to the metallicity gradient. On the other hand, the rotational velocity of the Sun around the Galactic center has no clear correlation with ages or metallicities of stars used in the estimation.