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Astron. Astrophys. 356, 490-500 (2000)

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Eclipse mapping of the accretion stream in UZ Fornacis *

J. Kube, B.T. Gänsicke and K. Beuermann

Universitäts-Sternwarte Göttingen, Geismar Landstrasse 11, 37083 Göttingen, Germany

Received 4 August 1999 / Accepted 17 December 1999

Abstract

We present a new method to map the surface brightness of the accretion streams in AM Herculis systems from observed light curves. Extensive tests of the algorithm show that it reliably reproduces the intensity distribution of the stream for data with a signal-to-noise ratio [FORMULA]. As a first application, we map the accretion stream emission of C IV [FORMULA] 1550 in the polar UZ Fornacis using HST FOS high state spectra. We find three main emission regions along the accretion stream: (1) On the ballistic part of the accretion stream, (2) on the magnetically funneled stream near the primary accretion spot, and (3) on the magnetically funneled stream at a position above the stagnation region.

Key words: accretion, accretion disks – methods: data analysis – stars: binaries: close – stars: binaries: eclipsing – stars: individual: UZ For – stars: novae, cataclysmic variables

* The observational part of this work is based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with proposal ID 4013.

Send offprint requests to: Jens Kube (jkube@uni-goettingen.de)

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© European Southern Observatory (ESO) 2000

Online publication: April 10, 2000
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