Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.370.1393b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 370, Issue 3, pp. 1393-1400.
Astronomy and Astrophysics
Astronomy
7
Galaxy: Kinematics And Dynamics: Methods: Numerical, Galaxy: Kinematics And Dynamics, Methods: Numerical
Scientific paper
To study the kinematics of O-B5 giant stars (luminosity class III), 290 non-Gould belt stars with proper motions taken from the Hipparcos catalogue are used, of which 107 have radial velocities taken from other sources. Semidefinite programming solves for the kinematical parameters and the coefficients of the velocity ellipsoid. The condition that both solutions must yield the same solar velocity is enforced. The results obtained are reasonable: solar velocity of 13.83 +/- 0.17 km s-1 Oort's constants, in units of km s-1 kpc-1, A = 16.08 +/- 0.72 and B = -10.74 +/- 0.65, implying a rotational velocity of 228.0 +/- 21.4 km s-1 if we take the distance to the Galactic Centre as 8.5 +/- 1.1 kpc; velocity dispersions, in units of km s-1, of σx = 32.44 +/- 5.04, σy = 26.16 +/- 2.75, σz = 18.71 +/- 2.39 with a vertex deviation of
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