Rotation Curve of Outer Disk from UCAC2 Proper Motions
We present a method for the determination of rotation curve of the Galaxy outer disk by using statistical parallax based on the USNO CCD Astrograph Cata log (UCAC2). Statistical method is used in order to obtain the heliocentric distance of selected star groups and their rotational velocity with respect to the Galactic cen ter.An anti-galactic-center sample of 6,714 objects is picked as tracer8 from 48,330,571 UCAC2 stars. Solar peculiar motion component that perpendicular to Galactic plane is employed to calculate distance, and mean proper motion along galactic longitude to calculate the rotational velocity. The result is a flat rotation curve a little lower than 220kms-l and show show coherence with those obtained from revised Hipparcos data.
astrometry Galaxy kinematics catalogs
Jia-Cheng Liu Zi Zhu
Department of Astronowy, Nanjing University, Nanjing, China
国际会议
The 10th Asian-Pacific Regional International Astronomical Union Meeting(第十届亚洲及太平洋地区天文学大会 APRIM)
昆明
英文
387-389
2008-08-03（万方平台首次上网日期，不代表论文的发表时间）