Information from the Kinematics of F and G Stars in the Solar Neighborhood
Information from the Kinematics of F and G Stars in the Solar Neighborhood作者机构：National Astronomical Observatories Chinese Academy of Sciences Beijing 100012
出 版 物：《Chinese Journal of Astronomy and Astrophysics》 (中国天文和天体物理学报（英文版）)
年 卷 期：2002年第2卷第5期
页 面：419-428页
核心收录：
学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学]
基 金：NKBRSF G1999075406 the National Natural Science Foundation of China under grant 10173014
主 题：stars: kinematics Galaxy: evolution Galaxy: solar neighborhood
摘 要：We have calculated the orbital parameters for 90 stars in Chen et al. and updated the kinematic data for stars in Edvardsson et al. by using the accurate Hipparcos parallaxes and proper motions, and recalculated the α-element abundances in Edvardsson et al. in a way consistent with Chen et al. The two sets of data are combined in a study of stellar populations and characteristics of F & G stars in the solar neighborhood. We confirm the result of Chen et al. that a distinguishable group of stars may belong to the thick disk rather than the thin disk. The ages for the stars are determined using the theoretical isochrones of VandenBerg et al. The age-metallicity relation is investigated for different subgroups according to distance from the sun and galactic orbital parameters. It is found that a mixing of stars with different orbital parameters significantly affect the age-metallicity relation for the disk. Stars with orbits confined to the solar circle all have metallicities [Fe/H] -0.3 irrespective of their distances from the sun or from the Galactic plane.
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