Kinematics of Sco-Cen OB Association (Bobylev+, 2007)

Details Kinematics of Sco-Cen OB Association (Bobylev+, 2007) Kinematics of Sco-Cen OB Association (Bobylev+, 2007)

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat.100330643b&link_type=abstract

VizieR On-line Data Catalog: J/PAZh/33/643. Originally published in: 2007PAZh...33..643B; 2007AstL...33..571B

Mathematics

Probability

Associations: Stellar, Proper Motions, Radial Velocities, Space Velocities, Magnitudes

Scientific paper

A fine structure related to the kinematic peculiarities of three components of the Scorpius-Centaurus association (LCC = Lower Centaurus-Crux, UCL = Upper Centaurus-Lupus, and US = Upper Scorpius) has been revealed in the UV-velocity distribution of Gould Belt stars. We have been able to identify the most likely members of these groups by applying the method of analyzing the two-dimensional probability density function of stellar UV velocities that we developed. A kinematic analysis of the identified structural components has shown that, in general, the center-of-mass motion of the LCC, UCL, and US groups follows the motion characteristic of the Gould Belt, notably its expansion. The entire Scorpius-Centaurus complex is shown to possess a proper expansion with an angular velocity parameter of 46+/-8km/s/kpc for the kinematic center with l0=-40{deg} and R0=110pc found. Based on this velocity, we have estimated the characteristic expansion time of the complex to be 21+/-4Myr. The proper rotation velocity of the Scorpius-Centaurus complex is lower in magnitude, is determined less reliably, and depends markedly on the data quality.
(1 data file).

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