Galactic kinematics and structure defined by open clusters
Galactic kinematics and structure defined by open clusters
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由疏散星团定义的星系运动学和结构
DOI：
10.1088/1674-4527/9/12/001
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发表时间：
2009-09
影响因子：
1.8
通讯作者：
朱紫
中科院分区：
文献类型：
--
作者：
朱紫
On the basis of recently published astrophysical parameters of the open clusters, we have selected 301 clusters with measurements of their kinematical parameters to trace the local structure and kinematics of the Galactic disk. The present sample covers a range of over 3.0 kpc from the Sun and gives signi fi cant estimates of the disk structure and kinematical parameters of the Galaxy. We derive the disk scale height, vertical displacement of the Sun to the Galactic plane, solar motion with respect to the local standard of rest, circular speed of the Galactic rotation, Galactocentric distance from the Sun, etc. We found that the average scale height of the disk de fi ned by the open clusters is z h = 58±4 pc, with a vertical displacement of the Sun below the Galactic plane of z 0 = − 16 ± 4 pc. Clusters with ages older than 50 Myr are less concentrated in the average plane ( z h = 67 ± 6 pc) than the younger clusters ( z h = 51 ± 5 pc). Using the approximation of axisymmetric circular rotation, we have derived the distance to the Galactic center from the Sun R 0 = 8 . 03± 0 . 70 kpc, which is in excellent agreement with the best estimate of the Galactocentric distance. From a kinematical analysis, we found an agedependent rotation of the Galaxy. The older clusters exhibit a lower velocity of vorticity, but have the same shear as the younger clusters. The mean rotation velocity of the Galaxy was obtained as 235 ± 10 km s -1
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DOI：
10.1086/300198
发表时间：
1997-10
期刊：
The Astronomical Journal
影响因子：
--
作者：
M. Metzger;J. Caldwell;P. Schechter
通讯作者：
M. Metzger;J. Caldwell;P. Schechter
影响因子：
1
作者：
V. Avedisova
通讯作者：
V. Avedisova
DOI：
10.1046/j.1365-8711.2000.03582.x
发表时间：
2000-01
影响因子：
4.8
作者：
R. Genzel;C. Pichon;A. Eckart;O. Gerhard;T. O. Mpe;U. Basel;O. Strasbourg
通讯作者：
R. Genzel;C. Pichon;A. Eckart;O. Gerhard;T. O. Mpe;U. Basel;O. Strasbourg
DOI：
10.1086/301198
发表时间：
1991-03
期刊：
The Astronomical Journal
影响因子：
--
作者：
R. Mendez;I. Platais;T. Girard;V. Kozhurina-Platais;W. V. van Altena
通讯作者：
R. Mendez;I. Platais;T. Girard;V. Kozhurina-Platais;W. V. van Altena
DOI：
10.1086/312292
发表时间：
1999-08
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
R. M'endez;I. Platais;T. Girard;V. Kozhurina-Platais;W. V. van Altena
通讯作者：
R. M'endez;I. Platais;T. Girard;V. Kozhurina-Platais;W. V. van Altena