Galactic Subsystems on the Basis of Cumulative Distribution of Space Velocities

Details Galactic Subsystems on the Basis of Cumulative Distribution of Space Velocities Galactic Subsystems on the Basis of Cumulative Distribution of Space Velocities

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008seraj.177...39v&link_type=abstract

Serbian Astronomical Journal, vol. 177, pp. 39-45

Astronomy and Astrophysics

Astronomy

1

Galaxy: Kinematics And Dynamics, Galaxy: Structure, Galaxy: Solar Neighborhood

Scientific paper

A sample containing 4,614 stars with available space velocities and high-quality kinematical data from the Arihip Catalogue is formed. For the purpose of distinguishing galactic subsystems the cumulative distribution of space velocities is studied. The fractions of the three subsystems are found to be: thin disc 92%, thick disc 6% and halo 2%. These results are verified by analysing
the elements of velocity ellipsoids and the shape and size of the galactocentric orbits of the sample stars, i.e. the planar and vertical eccentricities of the orbits.

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