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Probing Non-Axisymmetry with Proper Motions

Published online by Cambridge University Press:  07 August 2017

James Binney
James Binney*
Affiliation:
Department of Physics 1 Keble Road, Oxford, OX1 3NP, England

Abstract

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The potential of the Milky Way is almost certainly not axisymmetric: the centre is believed to be dominated by a bar, and beyond the solar radius some non-axisymmetric feature of the potential appears to warp the disk. There are grounds for believing that the outer potential is mildly elliptical. Sub mas yr–1 proper motions of objects that lie near the plane several kiloparsecs from the Sun would play a crucial role in refining our understanding of these non-axisymmetries.

Type
2. Current and Future Needs for Very Accurate Astrometry
Information
Symposium - International Astronomical Union , Volume 166: Astronomical and Astrophysical Objectives of Sub-Milliarcsecond Optical Astrometry , 1995 , pp. 239 - 246
Copyright
Copyright © Kluwer 1995 

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