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Astron. Astrophys. Suppl. Ser. 144, 45-51

Hipparcos astrometry for 257 stars using Tycho-2 data[*] [*]

C. Fabricius - V.V. Makarov

Copenhagen University Observatory, Juliane Maries Vej 30, DK-2100 Copenhagen Ø, Denmark

Received December 6, 1999; accepted February 18, 2000


We present improved Hipparcos astrometry for 257 Hipparcos stars, resolved into 342 components. For 64 of the stars no astrometry was obtained in the Hipparcos Catalogue, while for the remaining stars additional components have been added by this solution or the positions have been revised considerably. We have used the published Hipparcos transit data for the new solutions, together with results from the second reduction of the Tycho data for defining better initial values.

Key words: astrometry -- catalogs -- stars: fundamental parameters -- binaries: visual

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