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Paper: Cepheid Period-Luminosity Relation and Kinematics Based on the Revised Hipparcos Catalogue
Volume: 451, 9th Pacific Rim Conference on Stellar Astrophysics
Page: 151
Authors: Zhang, H.; Shen, M.; Zhu, Z.
Abstract: The revised Hipparcos catalogue was released by van Leeuwen in 2007. The revised parallaxes of the classical Cepheids yield the zero-point of the period-luminosity relation ρ=–1.37± 0.07 in the optical BV bands, which is 0.06mag fainter than that given by Feast & Catchpole from the old Hipparcos data. Moreover, we discuss the kinematic parameters of the Galaxy based on an axisymmetric model. The Oort constants are A=17.42± 1.17km s–1kpc–1, B=–12.46± 0.86km s–1kpc–1, and the peculiar motion of the Sun is (12.58±1.09,14.52± 1.06, 8.98±0.98)km s–1. Using a dynamical model for an assumed elliptical disk, a weak elliptical potential of the disk is found with eccentricity ε(R0)=0.067± 0.036 and the direction of minor axis φb=31.7°± 14.5°.
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