HST astrometry: the Galactic constant Theta_0/R_0

Details HST astrometry: the Galactic constant Theta_0/R_0 HST astrometry: the Galactic constant Theta_0/R_0

2003-03-11

arxiv.org/abs/astro-ph/0303230v1

Mem.Soc.Ast.It. 74 (2002) 10-12

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, SAIt Padova, 10-12 aprile 2002

Scientific paper

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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