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Preprint 11/99

CCD photometry of variable subdwarfs and white dwarfs

Sonja Schuh (1), Stefan Dreizler (1), Jochen L. Deetjen (1), Uli Heber (2), Ralf D. Geckeler (3)

(1) Institut für Astronomie und Astrophysik, Astronomie, Universität Tübingen, Waldhäuser Str. 64, D-72076 Tübingen, Germany
(2) Dr. Remeis-Sternwarte Bamberg, Sternwartstraße 7, D-96049 Bamberg, Germany
(3) Institut für Astrophysik, Technikerstraße 25, A-6020 Innsbruck, Austria

To appear in: Baltic Astronomy, 8, 1999

Abstract. We report on our time resolved photometry of subdwarfs and white dwarfs using the Calar Alto observatory. Candidates are taken from a spectroscopically pre-selected sample obtained from the Hamburg Schmidt Survey. We also report on our experience during the WET run in April 1999 and introduce our revised CCD photometry reduction package TRIPP, as well as preliminary results.

Key words: Methods: data analysis - Techniques: photometric - Stars: interiors - Stars: oscillations - subdwarfs - white dwarfs

Paper (65k gzip'ed Postscript including figures)

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