Reaching the boundary between stellar kinematic groups and very wide binaries - The Washington double stars with the widest angular separations

  title={Reaching the boundary between stellar kinematic groups and very wide binaries - The Washington double stars with the widest angular separations},
  author={Jos{\'e} A. Caballero},
  journal={Astronomy and Astrophysics},
  • J. Caballero
  • Published 19 August 2009
  • Physics
  • Astronomy and Astrophysics
Aims. I look for and characterise very wide binaries and multiple systems with projected physical separations larger than $s = 0.1$ pc, which is generally believed to be a sharp upper limit to the distribution of wide binary semimajor axes. Methods. I investigated in detail 30 Washington double stars with angular separations of ρ > 1000 arcsec. I discarded 23 of them as probably unbound systems based on discordant astrometry, photometry, spectral types, and radial velocities. The remaining… 

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