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The fundamental definition of “radial velocity”

descriptionPublicationkeyboard_double_arrow_right Article , Preprint , Other literature type 01 Apr 2003Embargo end date: 01 Jan 2003 Sweden Publisher:EDP SciencesJournal:Astronomy & Astrophysics, volume 401, pages 1,185-1,201 (issn: 0004-6361, eissn: 1432-0746,

Authors: Lindegren, Lennart; Dravins, Dainis;

doi: 10.1051/0004-6361:20030181 , 10.48550/arxiv.astro-ph/0302522

arXiv: http://arxiv.org/abs/astro-ph/0302522

The fundamental definition of “radial velocity”

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Abstract

Accuracy levels of metres per second require the fundamental concept of 'radial velocity' for stars and other distant objects to be examined, both as a physical velocity, and as measured by spectroscopic and astrometric techniques. Aiming at definitions that are unambiguous at accuracy levels of 1 m/s, we analyse different concepts of radial velocity and their interrelations. We distinguish between the geometrically defined 'kinematic radial velocity' and 'astrometric radial velocity' on one hand, and the spectroscopically defined 'barycentric radial-velocity measure' on the other. The last two concepts are defined by recent resolutions adopted by the International Astronomical Union (IAU), the motives and consequences of which are explained in this paper.

19 pages, 1 figure. Accepted for publication in Astronomy & Astrophysics

Country

Sweden

Related Organizations

Lund University
Sweden

Keywords

kinematics [stars], Astrophysics (astro-ph), data analysis [methods], astrometry, Astronomy, Astrophysics and Cosmology, FOS: Physical sciences, spectroscopic [techniques], radial velocities [techniques], reference systems, Astrophysics

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	influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	Top 1%
	impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.	Top 10%