A kinematic study of K-Type Stars

Statistics – Computation

Scientific paper

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Cool Stars, K Stars, Kinematic Equations, Late Stars, Solar System, Stellar Motions, Computational Astrophysics, Galactic Nuclei, Milky Way Galaxy, Radial Velocity, Solar Position, Star Distribution, Stellar Evolution

Scientific paper

Recently available radial velocity data of K-stars are used for an analysis of their kinematics in the solar neighborhood. Solution for the mean solar motion is nu(0) = -9.1 + or - 2.2, v(0) = -20.4 + or - 2.6, w(0) = -5.2 + or - 2.5 km/s, in fair agreement with previous determinations. Another solution using proper motions from the SAO Catalogue shows no significant differences. After dividing the stars into groups according to their w-velocities, it was found that the younger disk stars have an outward (away from the Galactic center) motion of about 7 km/s relative to the older disk stars. Also, the mean solar motion found for these nearby K-stars appears to be consistent with the kinematics of the Gould's Belt.

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