Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.170..187h&link_type=abstract
(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640
Astronomy and Astrophysics
Astrophysics
Milky Way Galaxy, Radial Velocity, Solar Neighborhood, Spherical Harmonics, Stellar Motions, Taylor Series, Galactic Evolution, Kinematics, Star Distribution, Velocity Distribution
Scientific paper
This paper relates two methods of analyzing the kinematic parameters of the local macroscopic motions of the Galaxy: (1) the Ogorodnikov-Milne model (OM) that consists in the three-dimensional Taylor expansion of the mean velocity field, and (2) the two-dimensional spherical harmonic development of the velocity components (SH). The theoretical relations between the SH coefficients and the second-order OM ones for the radial velocity v(r), and the galactic heliocentric components of the velocity U, V, W are presented. Only the hypothesis of separability of the stellar density function of the sample into angular and radial parts is needed. They are applied to 4732 A-M stars included in the Figueras (1986) sample.
Hernandez-Pajares Manuel
Nunez Jorge
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