A purely geometric distance to the binary star Atlas, a member of the Pleiades

  title={A purely geometric distance to the binary star Atlas, a member of the Pleiades},
  author={N. Zwahlen and Pierre L. North and Yves Debernardi and Laurent Eyer and Franck Galland and Martin A. T. Groenewegen and C. Hummel Laboratoire d'Astrophysique de l'EPFL and Obs. Geneve and Observatoire de Grenoble and Leuven and European Southern Observatory},
  journal={Astronomy and Astrophysics},
We present radial velocity and new interferometric measurements of the double star Atlas, which permit, with the addition of published interferometric data, to precisely derive the orbital parameters of the binary system and the masses of the components. The derived semi-major axis, compared with its measured angular size, allows to determine a distance to Atlas of 132 ± 4 pc in a purely geometrical way. Under the assumption that the location of Atlas is representative of the average distance… 

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