Kinematics of solar neighborhood stars and its dependence on age and metallicity

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 analy...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2015-03, Vol.15 (3), p.393-406
Main Authors: Huyan, Zong-Bo, Zhu, Zi, Liu, Jia-Cheng
Format: Article
Language:English
Subjects:
Correlation
Kinematics
Mathematical models
Metallicity
Photometry
Solar neighborhood
Stars
Stellar age
天体测量
太阳运动
太阳附近
年龄
恒星
物理数据
金属性
银河系中心
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Summary: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 S_2） linearly increases with age, which may be a conse- quence of the scattering processes, and its value for a dynamical cold disk was found to be 8.0 ± 1.2 km s^-1. S_2 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.
ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/15/3/008