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Institut für Astronomie und Astrophysik

Abteilung Astronomie

Sand 1, D-72076 Tübingen, Germany

Preprint 04/95

Results from Tycho photometry

V. Grossmann(1), G. Bässgen(1), D.W. Evans(2), M. Grenon(3), M. Grewing(1,6), J.L. Halbwachs(4), E. Høg(5), H. Mauder(1), M.A.J. Snijders(6), K. Wagner(1), and A. Wicenec(1)

(1)Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2)Royal Greenwich Observatory (RGO), Madingley Road, Cambrigde CB3 0EZ, United Kingdom
(3)Observatoire de Genève, CH-1290 Sauverny, Switzerland
(4)Centre de Données de Strasbourg (CDS), Observatoire Astronomique, 11 rue de l' Université, F-67000 Strasbourg, France
(5)Copenhagen University Observatory, Østervoldgade 3, DK-1350 Copenhagen K, Denmark
(6) Institute de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France

accepted by Astronomy & Astrophysics

Abstract. The final Tycho database will contain astrometric and photometric data for about 1 million stars. Here we discuss the results of the Tycho photometric calibration for about 80% of the data acquired by the star mapper of the Hipparcos satellite and estimate the photometric precision in the final Tycho photometric data base. For a non-variable star of 7th (10th) magnitude with =~100 observations a precision of better than 10mmag (40mmag) can be expected in the Tycho star catalogue. The precision on (B-V)_T_ depends only slightly on the colour and is exptected to be better than 20mmag (60mmag) for the same number of observations. These results will be representative of the final Tycho photometric quality.

Key words: stars: photometry - catalogues - data analysis - Hipparcos

Paper (23k gzip'ed Postscript without figures)
Figure 1a (16k) Figure 1b (18k) Figure 2 (436k) Figure 3 (24k) Figure 4 (7k) Figure 5a (27k) Figure 5b (24k) (all gzip'ed Postscript)

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Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de)
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