Local kinematics and the local standard of rest
Local kinematics and the local standard of rest
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DOI：
10.1111/j.1365-2966.2010.16253.x
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发表时间：
2009-12
影响因子：
4.8
通讯作者：
R. Schönrich;J. Binney;W. Dehnen
中科院分区：
文献类型：
--
作者：
R. Schönrich;J. Binney;W. Dehnen
我们重新检查恒星运动学的太阳附近的太阳速度相对于当地标准的休息。我们表明，经典的确定其组成部分Vin的银河系的旋转方向通过斯特朗伯格的关系是破坏的金属丰度梯度在光盘中，这引入了一组恒星的颜色和径向梯度的性质之间的相关性。将局部恒星运动学与考虑这些效应的化学动力学模型相比较，我们得到（U，V，W）=（11.1 + 0.69 −0.75，12.24 + 0.47 −0.47，7.25 + 0.37 −0.36）km s −1，并带有额外的系统不确定性<$（1，2，0.5）km s −1。特别是，维斯比先前估计的大7 km s −1。（U，V，W）的新值对盘内的金属丰度梯度非常不敏感。
We re-examine the stellar kinematics of the solar neighbourhood in terms of the velocity υ� of the Sun with respect to the local standard of rest. We show that the classical determination of its component Vin the direction of Galactic rotation via Str¨ omberg's relation is undermined by the metallicity gradient in the disc, which introduces a correlation between the colour of a group of stars and the radial gradients of its properties. Comparing the local stellar kinematics to a chemodynamical model which accounts for these effects, we obtain (U, V, W)� = (11.1 +0.69 −0.75 , 12.24 +0.47 −0.47 ,7 .25 +0.37 −0.36 )k m s −1 , with additional systematic uncertainties ∼(1, 2, 0.5) km s −1 . In particular, Vis 7 km s −1 larger than previously estimated. The new values of (U, V, W)� are extremely insensitive to the metallicity gradient within the disc.