Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.177..483f&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 177, no. 1-2, March 1991, p. 483-490.
Astronomy and Astrophysics
Astrophysics
1
Galactic Rotation, Radial Velocity, Solar Neighborhood, Stellar Motions, Stellar Parallax, Taylor Series, Astrometry, Covariance, Stellar Spectra, Velocity Distribution
Scientific paper
The kinematic parameters are determined of the Galactic rotation in the solar neighborhood when the Galactic velocity field is expanded until the second-order terms of its Taylor development. For this purpose, it has been necessary to use a larger sample of stars and better distributed in Galactic latitude than hitherto. The solution method applied and the results obtained when the hypothesis of cylindrical symmetry is made are presented. The small correlations obtained between the second-order partial derivatives indicate that some of these parameters can be solved at present. A good concordance is obtained between the present value and the hypothesis made by several previous authors concerning these terms: Trumpler and Weaver (1962), Clube (1974) and Brosche and Schwan (1981).
Figueras F.
Nunez Jorge
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