Journal
ASTROPHYSICS AND SPACE SCIENCE
Volume 271, Issue 4, Pages 353-363Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1002429028995
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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, partial derivative V-theta/partial derivative theta/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-theta = -240.5 +/- 10.2 km s(-1) for the classical Cepheids.
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