| Information from the Kinematics of F and G Stars in the Solar Neighborhood |
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| 作者姓名： | Yu-Qin Chen Gang Zhao and Jian-Rong ShiNational Astronomical Observatories Chinese Academy of Sciences Beijing |
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| 作者单位： | Yu-Qin Chen，Gang Zhao and Jian-Rong ShiNational Astronomical Observatories，Chinese Academy of Sciences，Beijing 100012 |
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| 基金项目： | NKBRSF G1999075406，the National Natural Science Foundation of China under grant 10173014. |
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| 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 \\\\\\\\\\\\-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 irresp
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| 关 键 词： | 恒星 运动学 银河系 轨道参数 金属性 |
Information from the Kinematics of F and G Stars in the Solar Neighborhood |
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| Yu-Qin Chen,Gang Zhao and Jian-Rong ShiNational Astronomical Observatories,Chinese Academy of Sciences,Beijing .Information from the Kinematics of F and G Stars in the Solar Neighborhood[J].Chinese Journal of Astronomy and Astrophysics,2002,2(5):419-428. |
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| Authors: | Yu-Qin Chen Gang Zhao Jian-Rong Shi |
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| Abstract: | 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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| Keywords: | stars: kinematics - Galaxy: evolution - Galaxy: solar neighborhood |
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