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The local stellar velocity field via vector spherical harmonics

Show simple item record Makarov, V. V. Murphy, D. W. 2008-11-10T16:33:26Z 2008-11-10T16:33:26Z 2007-07
dc.identifier.citation The Astronomical Journal, 134:367Y375, 2007 July en_US
dc.identifier.clearanceno 07-1315
dc.description.abstract We analyze the local field of stellar tangential velocities for a sample of 42,339 nonbinary Hipparcos stars with accurate parallaxes, using a vector spherical harmonic formalism.We derive simple relations between the parameters of the classical linear model (Ogorodnikov-Milne) of the local systemic field and low-degree terms of the general vector harmonic decomposition. Taking advantage of these relationships, we determine the solar velocity with respect to the local stars of (Vx ; Vy ; Vz) = (10.5; 18.5; 7.3) ± 0:1 km s-1 not corrected for the asymmetric drift with respect to the local standard of rest. If only stars more distant than 100 pc are considered, the peculiar solar motion is (Vx ; Vy ; Vz ) = (9.9; 15.6; 6.9) ± 0:2 km s-1. The adverse effects of harmonic leakage, which occurs between the reflex solar motion represented by the three electric vector harmonics in the velocity space and higher degree harmonics in the proper-motion space, are eliminated in our analysis by direct subtraction of the reflex solar velocity in its tangential components for each star... en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher The American Astronomical Society en_US
dc.subject Galaxy en_US
dc.subject kinematics en_US
dc.subject dynamics en_US
dc.title The local stellar velocity field via vector spherical harmonics en_US
dc.type Article en_US

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