Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...296..164h&link_type=abstract
Astronomy and Astrophysics, v.296, p.164
Astronomy and Astrophysics
Astrophysics
38
Accretion, Methods: Data Analysis, Stars: Re 2107-05, Binaries: Eclipsing
Scientific paper
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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