Analyzing Hipparcos proper motions of 1352 O B5 stars, we have found a clear stellar warping motion that is a systematic rotation +3 8±1 1 kms -1 kpc -1 of stars about the axis pointing to the galactic center in ...Analyzing Hipparcos proper motions of 1352 O B5 stars, we have found a clear stellar warping motion that is a systematic rotation +3 8±1 1 kms -1 kpc -1 of stars about the axis pointing to the galactic center in the sense of increasing the inclination of the HI warp, and a remarkably large galactic rotation of (V 0) O-B5 = 268 7 ± 11 9kms -1 , compared with the IAU recommendation (V 0 = 220 ± 20kms -1 ), given the galactocentric distance of the sun R 0 = 8 5kpc. Combining Hipparcos proper motions and the radial velocity data, we have then studied the kinematics for 151 classical cepheids. The results show a contracting motion of the Galaxy in the solar neibourhood, V θ/θ/R =-2 60 ± 1 07kms -1 kps -1 , which is along the solar circle. In the present paper, we have also analyzed proper motions of 21000 K-M giants, and again we found a large galactic rotation (V 0) K-M = 252 6±9 5kms -1 .展开更多
文摘Analyzing Hipparcos proper motions of 1352 O B5 stars, we have found a clear stellar warping motion that is a systematic rotation +3 8±1 1 kms -1 kpc -1 of stars about the axis pointing to the galactic center in the sense of increasing the inclination of the HI warp, and a remarkably large galactic rotation of (V 0) O-B5 = 268 7 ± 11 9kms -1 , compared with the IAU recommendation (V 0 = 220 ± 20kms -1 ), given the galactocentric distance of the sun R 0 = 8 5kpc. Combining Hipparcos proper motions and the radial velocity data, we have then studied the kinematics for 151 classical cepheids. The results show a contracting motion of the Galaxy in the solar neibourhood, V θ/θ/R =-2 60 ± 1 07kms -1 kps -1 , which is along the solar circle. In the present paper, we have also analyzed proper motions of 21000 K-M giants, and again we found a large galactic rotation (V 0) K-M = 252 6±9 5kms -1 .
