A&A 384, 180-189 (2002)
DOI: 10.1051/0004-6361:20011822

The Tycho double star catalogue

C. Fabricius¹, E. Høg¹, V. V. Makarov^{1, 2, 3}, B. D. Mason³, G. L. Wycoff³ and S. E. Urban<sup>3

1</sup>  Copenhagen University Observatory, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
²  Universities Space Research Association, 300 D Street S.W., Washington, DC 20024, USA
³  United States Naval Observatory, 3450 Massachusetts Avenue N.W., Washington, DC 20392-5420, USA

(Received 20 November 2001 / Accepted 18 December 2001 )

Abstract
We report the discovery of visual double stars, mostly with separations between 0.3 and 1 arcsec, from a dedicated re-reduction of the Tycho data from the star mapper of the ESA Hipparcos satellite. The new doubles are combined with WDS systems identified in the Catalogue, and 1220 new doubles, to form the Tycho Double Star Catalogue, TDSC, a catalogue of absolute astrometry and , photometry for components of  double and multiple star systems. We also include results for  single components for systems unresolved in TDSC, and a supplement gives Hipparcos and data for 4777 additional components. The TDSC thus contains a total of entries. Cross identifications are given to WDS, HD, Hipparcos and .

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

Offprint request: C. Fabricius, cf@astro.ku.dk

SIMBAD Objects
Tables at the CDS

© ESO 2002

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

• If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
• You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
• You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.