Here, 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 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 mean of Oort constants A = 15.6 ± 1.6 km s -1 kpc -1 and B = -13.9 ± 1.8 km s -1 kp -1 and angular velocity |A - B | = 29.5 ± 0.2 km s -1 kpc -1 , which implies a rotational velocity of 221.25 ± 26.66 km s -1 if we take the distance to the galactic center as 7.5 kpc.

中文翻译：

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光晕红巨星的运动学和速度椭球

在这里，我们的目标是使用光晕红巨星的样本来确定运动学特性、速度椭球和奥尔特常数。该研究主要基于从 SEGUE-1 和 SEGUE-2 巡天中收集到的 1583 颗红巨星的空间和径向速度。我们将样本分为三个子样本：内晕、外晕和星系平面附近的恒星。径向速度方程的拟合给出了奥尔特常数的平均值 A = 15.6 ± 1.6 km s -1 kpc -1 和 B = -13.9 ± 1.8 km s -1 kp -1 和角速度 |A - B | = 29.5 ± 0.2 km s -1 kpc -1 ，如果我们将到银河系中心的距离设为 7.5 kpc，这意味着旋转速度为 221.25 ± 26.66 km s -1。