Galactocentric distance of the Sun derived from kinematic data

ZHU Zi; SHEN Ming

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Galactocentric distance of the Sun derived from kinematic data

ZHU Zi 1 * #,SHEN Ming 2

1.School of Astronomy and Space science, Nanjing University, Nanjing 210093

2.National astronomical Observatries, Chinese Academy of Sciences, Beijing 100012

*Correspondence author

#Submitted by

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Funding: none

Opened online: 1 November 2012

Accepted by: none

Citation: ZHU Zi,SHEN Ming.Galactocentric distance of the Sun derived from kinematic data[OL]. [ 1 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4493066

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.

Keywords:Astrometry; Galaxy: disk; Galaxy fundamental parameters; Galaxy: kinematics and dynamics; solar neighborhood

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