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1. Galactocentric distance of the Sun derived from kinematic data | |||
ZHU Zi,SHEN Ming | |||
Astronomy 25 October 2012 | |||
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Abstract:Based on the radial velocity data and the Hipparcos proper motions, a new determination of the Galactocentric distance is presented via a purely kinematic model. Three subgroups of Galactic thin disk components (O-B5 stars, classical Cepheids and the Galactic open clusters) are selected to trace the local structure and kinematics of the Galactic disk. Adopting the approximation of axisymmetric circular rotation, the Sun's distance to the Galactic center is derived, R0=8.25±0.79 kpc based on O-B5 stars, R0=7.98±0.79 kpc based on Galactic Cephieds and R0=8.03±0.70 kpc using open clusters, all of which are in excellent agreement with the current-best estimate of the Galactocentric distance. | |||
TO cite this article:ZHU Zi,SHEN Ming. Galactocentric distance of the Sun derived from kinematic data[J]. |
2. Periodic Solutions for Some Second Order Hamiltonian Systems | |||
Zhang Shiqing | |||
Astronomy 27 February 2009 | |||
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Abstract:We use saddle point theorems of Benci-Rabinowitz and Silva to study the existence of periodic solutions with a fixed energy for a few second order Hamiltonian conservative systems without any symmetry,the key difficulty of the proof is proving Palais-Smale condition and the nonconstant property for the minimax critical point. | |||
TO cite this article:Zhang Shiqing. Periodic Solutions for Some Second Order Hamiltonian Systems [OL].[27 February 2009] http://en.paper.edu.cn/en_releasepaper/content/29753 |
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