Kinematics and velocity ellipsoid of the G giants

R.L. BRANHAM, JR.

Boletin de la asociacion argentina de astronomia

Asociacion Argentina de Astronomia

Año: 2011 vol. 53 p. 93 - 96

1669-9521

3,075 parallaxes and proper motions along with 658 radial velocities are used to calculate the kinematics and velocity ellipsoid of the G giants (luminosity class III). Semi-definite programming solves simultaneously for the twelve kinematical parameters, based on the Ogorodnikov- Milne model, and the ten coefficients of the velocity ellipsoid. The singular value decomposition permits, for the calculation of the coefficients of the velocity ellipsoid, use of stars for which only tangential velocities are available. Results are in agreement with those found in the literature.3,075 parallaxes and proper motions along with 658 radial velocities are used to calculate the kinematics and velocity ellipsoid of the G giants (luminosity class III). Semi-definite programming solves simultaneously for the twelve kinematical parameters, based on the Ogorodnikov- Milne model, and the ten coefficients of the velocity ellipsoid. The singular value decomposition permits, for the calculation of the coefficients of the velocity ellipsoid, use of stars for which only tangential velocities are available. Results are in agreement with those found in the literature.