Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pobeo..86..313v&link_type=abstract
Publications of the Astronomical Observatory of Belgrade, vol. 86, pp. 313-317
Astronomy and Astrophysics
Astronomy
Scientific paper
A sample containing 4614 stars with available space velocities and qualitative kinematical data from the ARIHIP Catalogue is formed. The components of the solar motion (U_{&sun;},V_{&sun;},W_{&sun;}) with respect to the dynamical local standard of rest, the elements of the velocity ellipsoid (the intensity and spatial distribution) and the value of the asymmetric drift are obtained in two different ways: according to space velocity and color index. The results agree very well with the values found in the literature. For the purpose of detaching galactic subsystems the cumulative distribution of space velocities is studied. The fractions of stars, belonging to the assumed three subsystems, are found to be: thin disc 92 per cent, thick disc 6 per cent and halo 2 per cent. These results are verified by analyzing the shape and size of the galactocentric orbits of the sample stars, i.e. by analyzing the planar and vertical eccentricities of the orbits.
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