Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxaa..45..215b&link_type=abstract
Revista Mexicana de Astronomía y Astrofísica Vol. 45, pp. 215-229 (2009) (http://www.astroscu.unam.mx/~rmaa/)
Astronomy and Astrophysics
Astronomy
2
Galaxy: Kinematics And Dynamics, Methods: Numerical
Scientific paper
To study the kinematics of the K giant stars (luminosity class III) use is made of proper motions taken from van Leeuwen's new reduction of the Hipparcos catalog. 11,372 stars, of which 880 have radial velocities, were used in the final study. Semi-definite programming solves for the kinematical parameters such as the Oort constants and simultaneously for the coefficients of the velocity ellipsoid. The condition that both the solution for the solar velocity calculated from the kinematical parameters and from the velocity ellipsoid calculation be the same is enforced. The solution gives: solar velocity of 21.83+/-0.26 km s^{-1}; Oort's constant's, in units of km s^{-1} kpc^{-1}, A = 13.08+/-1.72 and B = -10.21+/-1.47, implying a rotational velocity of 197.94+/-44.73 km s^{-1} if we take the distance to the Galactic center as 8.2+/-1.1 kpc; velocity dispersions, in units of km s^{-1}, of: σ_{x}=50.58+/-0.99, σ_{y}=42.42+/-1.13, σ_{z}=32.92+/-0.56 with a vertex deviation of -7.53°+/-3.97°.
No associations
LandOfFree
Kinematics and Velocity Ellipsoid of the K Giants does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Kinematics and Velocity Ellipsoid of the K Giants, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kinematics and Velocity Ellipsoid of the K Giants will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1428496