Institut für Astronomie und Astrophysik

Abteilung Astronomie

Preprint 05/95

The Tycho Star Mapper Background analysis

A. Wicenec(1) and F. van Leeuwen(2)

(1)Institut für Astronomie und Astrophysik (Astronomie) der Universität Tübingen, Waldhäuserstr. 64, D-72076 Tübingen, FRG
(2)Royal Greenwich Observatory, Madingley Road, Cambridge CB3 0EZ, UK

accepted by Astronomy & Astrophysics

Abstract. The Hipparcos star mapper detector background signal has been analyzed in the Tycho reductions for contributions due to the diffuse galactic light. The methods are presented by which the contributions from the two fields of view of the telescope are separated after elimination of background variations due to the radiation environment (Van Allen belts). A complete sky background map, with a resolution of 0.25 square degrees and based on the data accumulated through almost two years of the mission is presented.

Key words: numerical methods - instruments - magnetoshere - Hipparcos

Paper (250k gzip'ed Postscript including figures 1-4,7)
Figures 5+6 (611k gzip'ed colour Postscript)

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Jürgen Barnstedt (barnstedt AT astro.uni-tuebingen.de) Last updated 04-Aug-1997