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The Hipparcos input catalogue
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Are the orbital poles of binary stars in the solar neighbourhood anisotropically distributed
We test whether or not the orbital poles of the systems in the solar neighbourhood are isotropically distributed on the celestial sphere. The problem is plagued by the ambiguity on the positionExpand
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Version 2 of the HIPPARCOS Input Catalogue
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The importance of wide-system studies for stellar evolution and galactic dynamics
Wide pairs and wide multiple systems have been too much neglected during many years by visual double star astronomers with the argument that only close visual pairs (short periods) may lead toExpand