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Title:
Accretion stream mapping in eclipsing polars. an application of MEM and genetic optimisation.
Authors:
Hakala, P. J.
Publication:
Astronomy and Astrophysics, v.296, p.164 (A&A Homepage)
Publication Date:
04/1995
Origin:
CDS; KNUDSEN
Astronomy Keywords:
ACCRETION, METHODS: DATA ANALYSIS, STARS: RE 2107-05, BINARIES: ECLIPSING
Bibliographic Code:
1995A&A...296..164H

Abstract

The discovery of RE2107-05 (Hakala et al. 1993; Schwope et al. 1993), the brightest of the four known eclipsing AM Her systems revealed that a significant proportion of the optical emission from AM Her systems originates within the accretion stream. This is clearly demonstrated by the asymmetric eclipse profiles obtained by Hakala et al. (1993). I present a new method for deriving the accretion stream brightness distribution from the eclipse profile photometry of AM Her systems using a maximum entropy method (MEM) and a Genetic Algorithm for optimisation. This technique is applied to the U band eclipse profile of RE2107-05. The qualitative results indicate, that the stream emission rises quadratically towards the white dwarf and there is a separate "hot spot" within the stream possibly due to the threading to the WD magnetosphere.

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