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HST Astrometry of M4 and the Galactic Constant V₀/R₀

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arxiv astro-ph/0304071 v1 pith:3E2SDIHF submitted 2003-04-03 astro-ph

HST Astrometry of M4 and the Galactic Constant V₀/R₀

L. R. Bedin (1) , G. Piotto (1) , I. R. King (2) , J. Anderson (3) ((1) Dipartimento di Astronomia , Universita` di Padova , ITA , (2) Astronomy Department , University of Washington
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USA (3) Rice University USA)
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keywords galacticclusterstarsabsoluteallowsalphaastrometricastrometry
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From multi-epoch WFPC2/HST observations we present astrometric measurements of stars in the Galactic globular cluster M4 (NGC 6121) and in the foreground/background. The presence of an extragalactic point source allows us to determine the absolute proper motion of the cluster, and, through use of the field stars in this region only 18 degree from the Galactic center, to measure the difference between the Oort constants, A-B. We find: (mu_alpha cos dec, mu_dec)_J2000 = (-13.21 +/- 0.35, -19.28 +/- 0.35) mas/yr, and A-B = V_0/R_0 = 27.6 +/- 1.7 km / s / kpc.

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