Astrometric mass ratios of 248 long-period binary stars resolved in Hipparcos and Gaia EDR3
Valeri V. Makarov,
Claus Fabricius
Abstract:Using the absolute astrometric positions and proper motions for common stars in the Hipparcos and Gaia catalogs separated by 24.75 years in the mean epoch, we compute mass ratios for long-period, resolved binary systems without any astrophysical assumptions or dependencies except the presence of inner binary subsystems that may perturb the observed mean proper motions. The mean epoch positions of binary companions from the Hipparcos Double and Multiple System Annex (DMSA) are used as the first epoch. The mean … Show more
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