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HST astrometry: the Galactic constant Theta_0/R_0

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arxiv astro-ph/0303230 v1 pith:ZV7VC36O submitted 2003-03-11 astro-ph

L. R. Bedin (1) , G. Piotto (1) , I. R. King (2) , J. Anderson (2) ((1) Universita` di Padova , (2) UC Berkeley.) This is my paper · ORCID
classification astro-ph
keywords thetaabsoluteallowsastrometricastrometrybulgecandidateconstant
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From multi-epoch WFPC2/HST observations we present astrometric measurements of the absolute motion of the bulge stars. The presence of an extragalactic point-source candidate allows us to measure the difference between the Oort constants, A-B = Theta_0/R_0. We find: Theta_0/R_0 = 27.4 +/- 1.8 km/s/kpc.

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Cited by 1 Pith paper

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  1. JWST Imaging of the Closest Globular Clusters -- VI. The Lowest-Mass Objects in M 4 and the Galactic Bulge

    astro-ph.SR 2025-07 conditional novelty 6.0 of 10

    Faint M4 stars observed with JWST are redder than models predict, suggesting a roughly 0.5 dex oxygen deficit in the lower main sequence, with tentative brown dwarf candidates down to about 1000 K.

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