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Precession and Stellar Kinematic Parameters from the Proper Motions of the AGK3U

Published online by Cambridge University Press:  07 August 2017

Wei Xue ,
Jing Wenjin  and
Xu Tongqi
Wei Xue
Affiliation:
Shanghai Observatory, Chinese Academia of Sciences 80 Nandan Road Shanghai 200030 China
Jing Wenjin
Affiliation:
Shanghai Observatory, Chinese Academia of Sciences 80 Nandan Road Shanghai 200030 China
Xu Tongqi
Affiliation:
Shanghai Observatory, Chinese Academia of Sciences 80 Nandan Road Shanghai 200030 China

Abstract

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Precessional corrections and stellar kinematic parameters have been derived from the proper motions of 142,171 stars in the updated version of AGK3 (AGK3U). The sky has been divided into 1332 small areas, in which mean proper motions for each component are formed for different magnitude intervals, with and without exclusion of fast stars. Solutions were performed for various kinds of the mean proper motions. Maximum-likelihood algorithm is used to take into account the ellipsoidal distribution of residual velocities. The results for precessional correction are, Δn = 0″.47 ± 0″.03 /cy, Δk = −0″.35 ± 0″.02 /cy, and the results for Oort's constants are, A = 9.5 ± 1.5 km/s/pc, B = −7.5 ± 1.5 km/s/pc.

Type
Impact on Astrophysics
Information
Symposium - International Astronomical Union , Volume 156: Developments in Astrometry and their Impacts on Astrophysics , 1993 , pp. 243 - 248
Copyright
Copyright © Kluwer 

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