| Velocity Space of Galactic O-B Stars |
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| 作者姓名： | Zi Zhu |
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| 作者单位： | Zi Zhu Department of Astronomy，Nanjing University，Nanjing 210093 |
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| 基金项目： | Supported by the National Natural Science Foundation of China. |
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| 摘 要： | Based on the Hipparcos proper motions and available radial velocity data of O-B stars, we have re-examined the local kinematical structure of the young disk population of-1500 O-B stars not including the Gould-belt stars. A systematic warping motion of the stars about the direction to the Galactic center has been reconfirmed. A negative K-term implying a systematic contraction of stars in the solar vicinity has been detected. Two different distance scales are used in order to find out their impact on the kinematical parameters, and we conclude that the adopted distance scale plays an important role in characterizing the kinematical parameters at the present level of the measurement uncertainty.
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| 关 键 词： | astrometry—Galaxy: kinematics and dynamics—stars: early-type—Galaxy: solar neighborhood |
Velocity Space of Galactic O-B Stars |
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| Zi Zhu.Velocity Space of Galactic O-B Stars[J].Chinese Journal of Astronomy and Astrophysics,2006,6(3):363-371. |
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| Authors: | Zi Zhu |
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| Institution: | Department of Astronomy, Nanjing University, Nanjing 210093 |
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| Abstract: | Based on the Hipparcos proper motions and available radial velocity data of O-B stars, we have re-examined the local kinematical structure of the young disk population of-1500 O-B stars not including the Gould-belt stars. A systematic warping motion of the stars about the direction to the Galactic center has been reconfirmed. A negative K-term implying a systematic contraction of stars in the solar vicinity has been detected. Two different distance scales are used in order to find out their impact on the kinematical parameters, and we conclude that the adopted distance scale plays an important role in characterizing the kinematical parameters at the present level of the measurement uncertainty. |
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| Keywords: | astrometry - Galaxy: kinematics and dynamics - stars: early-type - Galaxy:solar neighborhood |
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