Kinematics of the Galaxy's Stellar Populations from a Proper-Motion Survey

Details Kinematics of the Galaxy's Stellar Populations from a Proper-Motion Survey Kinematics of the Galaxy's Stellar Populations from a Proper-Motion Survey

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274..181s&link_type=abstract

Astronomy and Astrophysics, Vol. 274, NO. 1/JUL(I), P. 181, 1993

Astronomy and Astrophysics

Astrophysics

53

Galaxy: Kinematics And Dynamics - Galaxy: Structure, Astrometry

Scientific paper

A sample of reliable absolute proper motions, with no kinematic or metallicity bias, including 2370 stars, has been analysed in a 7 square degree field at b = 80°. Distances have been derived using B and V magnitudes. The distributions of the U and V components of the Galactic space motions with respect to the Sun have been studied in different bins of distance up to 2.75 kpc above the plane. Using a stochastic ML algorithm, stellar populations have been deconvolved, allowing the determination of some parameters of their velocity distribution and spatial distribution. The old disk is found to have a scale length of 6±2kpc, with mean velocity (U,V) = (0±6, -19±3)km/s and velocity dispersions (σU,σV) = (44±6, 24±4) km/s. The existence of the thick disk, with a scale length of 3±1.5 kpc, is clearly demonstrated. This intermediate population is rotating rapidly, Vrot = 179±16 km/s, with velocity dispersions (σU,σV) = (56±11,43±6) km/s. The halo is found to have a prograde rotation of Vrot = 58±12 km/s and velocity dispersions (σU,σV) = (137±13, 79±6) km/s. A spheroidal density law ∝ r-3±0.5 is compatible with this kinematical behavior.

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