HST astrometry: the Galactic constant Theta_0/R_0
Astrophysics
2007-05-23 v1
Abstract
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.
Cite
@article{arxiv.astro-ph/0303230,
title = {HST astrometry: the Galactic constant Theta_0/R_0},
author = {L. R. Bedin and G. Piotto and I. R. King and J. Anderson},
journal= {arXiv preprint arXiv:astro-ph/0303230},
year = {2007}
}
Comments
2 pages, 1 figure, SAIt Padova, 10-12 aprile 2002