The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry

  title={The Sirius System and Its Astrophysical Puzzles: Hubble Space Telescope and Ground-based Astrometry},
  author={Howard E. Bond and Gail H. Schaefer and Ronald L. Gilliland and Jay B. Holberg and Brian D. Mason and Irving W. Lindenblad and Miranda Seitz-McLeese and W. David Arnett and Pierre. Demarque and Federico Spada and Patrick A. Young and Martin A. Barstow and Matthew R. Burleigh and Donald H. Gudehus},
  journal={The Astrophysical Journal},
Sirius, the seventh-nearest stellar system, is a visual binary containing the metallic-line A1 V star Sirius A, the brightest star in the sky, orbited in a 50.13 year period by Sirius B, the brightest and nearest white dwarf (WD). Using images obtained over nearly two decades with the Hubble Space Telescope (HST), along with photographic observations covering almost 20 years and nearly 2300 historical measurements dating back to the 19th century, we determine precise orbital elements for the… 

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