Kinematics and Velocity Ellipsoid of Halo Red Giants
  In the present paper, we aim to determine the kinematical properties,
velocity ellipsoid, and Oort constants using a sample of halo red giants. The
study is based mainly on the space and radial velocities of about 1583 red
giant stars collected from the SEGUE-1 and SEGUE-2 surveys. We divided the
sample into three subsamples, the inner halo, the outer halo and the stars near
the galactic plane. The fitting of the radial velocity equation gives a the
mean of Oort constants, A = 15.6 +- 1.6 km s-1 kpc-1 and B= -13.9 +- 1.8 km s-1
kpc-1, the angular velocity |A-B|= 29.5 +- 0.2 km s-1 kpc-1 implying a
rotational velocity of 221.25 +- 26.66 km s-1 if we take the distance to the
Galactic center as 7.5 kpc.
