HST astrometry: the Galactic constant Theta_0/R_0

(2) UC Berkeley.); G. Piotto (1); I. R. King (2); J. Anderson (2) ((1) Universita` di Padova; L. R. Bedin (1)

arxiv: astro-ph/0303230 · v1 · submitted 2003-03-11 · 🌌 astro-ph

HST astrometry: the Galactic constant Theta₀/R₀

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

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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HST astrometry: the Galactic constant Theta₀/R₀

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