Local Kinematics of Classical Cepheids |
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| Authors: | Zi Zhu |
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| Institution: | (1) Shaanxi Astronomical Observatory, P.O. Box 18, Lintong, China;E-mail |
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| Abstract: | Combining Hipparcos proper motions and the radial velocity data, we have studied the Cepheid kinematics on the basis of the
three-dimensional Ogorodnikov-Milne model. The results seem to show a slight contracting motion of the Galaxy in the solar
neighbourhood, ∂ V
θ / ∂θ / R = −2.60 ± 1.07 km s-1 kpc-1, which is along the solar circle. Under the hypothesis of a circular stream model, we have determined the galactic rotation
V
θ = −240.5 ± 10.2 km s-1 for the classical Cepheids.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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