Hubble Space Telescope Astrometry of the Procyon System

@article{Bond2015HubbleST,
  title={Hubble Space Telescope Astrometry of the Procyon System},
  author={Howard E. Bond and Ronald L. Gilliland and Gail H. Schaefer and Pierre. Demarque and Terrence M. Girard and Jay B. Holberg and Donald H. Gudehus and Brian D. Mason and Vera Kozhurina-Platais and Matthew R. Burleigh and Martin A. Barstow and Edmund P. Nelan Penn State Univ. and Space Telescope Science Institute and Cehw and Penn. State Univ. and Chara Array and Georgia State Univ. and Yale Univ. and Lpl and University of Arizona and U. S. Naval Observatory and University of Leicester and UK.},
  journal={The Astrophysical Journal},
  year={2015},
  volume={813},
  pages={106}
}
Abstract : The nearby star Procyon is a visual binary containing the F5 IV-V subgiant Procyon A, orbited in a 40.84-year period by the faint DQZ white dwarf (WD) Procyon B. Using images obtained over two decades with the Hubble Space Telescope, and historical measurements back to the 19th century, we have determined precise orbital elements. Combined with measurements of the parallax and the motion of the A component, these elements yield dynamical masses of 1.478 plus or minus 0.012M and 0.592… 
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