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 Gala...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 significant 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 defined by the open clusters is Zh = 58 ± 4pc, with a vertical displacement of the Sun below the Galactic plane of z0 -= - 16±4 pc. Clusters with ages older than 50 Myr are less concentrated in the average plane （Zh=67 ±6pc） than the younger clusters （Zh = 51±5pc）. Using the approximation of axisymmetric circular rotation, we have derived the distance to the Galactic center from the Sun R0 = 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.展开更多
Over 200 experts and officials from across the country celebrated the 90^(th) anniversary of the Chinese Astronomical Society in Nanjing on October 30,2012. CUI Xiangqun,the Society's President,reviewed China'...Over 200 experts and officials from across the country celebrated the 90^(th) anniversary of the Chinese Astronomical Society in Nanjing on October 30,2012. CUI Xiangqun,the Society's President,reviewed China's major achievements in the field of astronomy in the past ten years,including the completion of the Large Sky展开更多
Q:Congratulations to you for becoming the new IAU president! What are the main objectives of the IAU in the coming three years? President Kaifu:The objective of the IAU is to promote astronomy in all its aspects.The p...Q:Congratulations to you for becoming the new IAU president! What are the main objectives of the IAU in the coming three years? President Kaifu:The objective of the IAU is to promote astronomy in all its aspects.The priority for the IAU at this time is to broaden the activities of astronomy in research,education and public outreach all over the world. We see more countries joining cutting-edge research,展开更多
Nearly 3,000 astronomers from around the globe celebrated their 'Olympics' for a fortnight from August 20 to 31,2012 in China.During the 28^(th) General Assembly of the International Astronomical Union(IAU),wh...Nearly 3,000 astronomers from around the globe celebrated their 'Olympics' for a fortnight from August 20 to 31,2012 in China.During the 28^(th) General Assembly of the International Astronomical Union(IAU),which was held at the China National Conference Center in the Olympic Green of Beijing,the astronomers enjoyed eight symposia, seven joint discussions and 18 special sessions on展开更多
The opening ceremony for the 36th Scientific Assembly of the Committee on Space Research （COSPAR） was held on the evening of July 17 in Beijing. Chinese President HU Jintao sent his congratulations to the assembly. ...The opening ceremony for the 36th Scientific Assembly of the Committee on Space Research （COSPAR） was held on the evening of July 17 in Beijing. Chinese President HU Jintao sent his congratulations to the assembly. Chinese Vice Premier ZENG Peiyan spoke at the opening ceremony.展开更多
I. The Creation of an Integrated Astronomical Research Center Following the launch of the CAS＇s Knowledge Innovation Program （KIP） pilot project in 1998, it was formally decided in April 1999 to merge the followin...I. The Creation of an Integrated Astronomical Research Center Following the launch of the CAS＇s Knowledge Innovation Program （KIP） pilot project in 1998, it was formally decided in April 1999 to merge the following CAS institutions： five astronomical observatories （Beijing Observatory, Purple Mountain Observatory, Shanghai Observatory, Yunnan Observatory and Shaanxi Observatory）, three research stations （Urumqi Astronomical Observatory, Changchun Astronomical Observatory and Guangdong Satellite Observation Station） and one research institute （Nanjing Institute of Optics and Technology）; into a new entity, to be known initially as the National Center for Astronomical Observations. Later, in April 2001, when the KIP was in full swing, a merger of some of the above institutions took place with the approval of the Ministry of Science ＆ Technology and the State Council. The new entity, which since the merger, has been known as the National Astronomical Observatories, CAS （NAOC）, is headquartered in Beijing on the site of the former Beijing Observatory. The new institution has four subordinate units, namely： Yunnan Observatory, Nanjing Institute of Optics and Technology （NIAOT）, Urumqi Astronomical Observatory （UAO） and Changchun Astronomical Observatory （CAO）.展开更多
CAS and the Max Planck Society （MPS） for the Advancement of Science have established two more partner groups in China. On August 3, CAS President LU Yongxiang and MPS President Peter Gruss were present at the inaugu...CAS and the Max Planck Society （MPS） for the Advancement of Science have established two more partner groups in China. On August 3, CAS President LU Yongxiang and MPS President Peter Gruss were present at the inaugural ceremony of the groups in Shanghai.展开更多
基金funded by the National Natural Science Foundation of China (NSFC) (Grant No.10673005)
文摘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 significant 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 defined by the open clusters is Zh = 58 ± 4pc, with a vertical displacement of the Sun below the Galactic plane of z0 -= - 16±4 pc. Clusters with ages older than 50 Myr are less concentrated in the average plane （Zh=67 ±6pc） than the younger clusters （Zh = 51±5pc）. Using the approximation of axisymmetric circular rotation, we have derived the distance to the Galactic center from the Sun R0 = 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.
文摘Over 200 experts and officials from across the country celebrated the 90^(th) anniversary of the Chinese Astronomical Society in Nanjing on October 30,2012. CUI Xiangqun,the Society's President,reviewed China's major achievements in the field of astronomy in the past ten years,including the completion of the Large Sky
文摘Q:Congratulations to you for becoming the new IAU president! What are the main objectives of the IAU in the coming three years? President Kaifu:The objective of the IAU is to promote astronomy in all its aspects.The priority for the IAU at this time is to broaden the activities of astronomy in research,education and public outreach all over the world. We see more countries joining cutting-edge research,
文摘Nearly 3,000 astronomers from around the globe celebrated their 'Olympics' for a fortnight from August 20 to 31,2012 in China.During the 28^(th) General Assembly of the International Astronomical Union(IAU),which was held at the China National Conference Center in the Olympic Green of Beijing,the astronomers enjoyed eight symposia, seven joint discussions and 18 special sessions on
文摘The opening ceremony for the 36th Scientific Assembly of the Committee on Space Research （COSPAR） was held on the evening of July 17 in Beijing. Chinese President HU Jintao sent his congratulations to the assembly. Chinese Vice Premier ZENG Peiyan spoke at the opening ceremony.
文摘I. The Creation of an Integrated Astronomical Research Center Following the launch of the CAS＇s Knowledge Innovation Program （KIP） pilot project in 1998, it was formally decided in April 1999 to merge the following CAS institutions： five astronomical observatories （Beijing Observatory, Purple Mountain Observatory, Shanghai Observatory, Yunnan Observatory and Shaanxi Observatory）, three research stations （Urumqi Astronomical Observatory, Changchun Astronomical Observatory and Guangdong Satellite Observation Station） and one research institute （Nanjing Institute of Optics and Technology）; into a new entity, to be known initially as the National Center for Astronomical Observations. Later, in April 2001, when the KIP was in full swing, a merger of some of the above institutions took place with the approval of the Ministry of Science ＆ Technology and the State Council. The new entity, which since the merger, has been known as the National Astronomical Observatories, CAS （NAOC）, is headquartered in Beijing on the site of the former Beijing Observatory. The new institution has four subordinate units, namely： Yunnan Observatory, Nanjing Institute of Optics and Technology （NIAOT）, Urumqi Astronomical Observatory （UAO） and Changchun Astronomical Observatory （CAO）.
文摘CAS and the Max Planck Society （MPS） for the Advancement of Science have established two more partner groups in China. On August 3, CAS President LU Yongxiang and MPS President Peter Gruss were present at the inaugural ceremony of the groups in Shanghai.
