Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..284b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 1, Sept. 1991, p. 284-294. Research supported by FAPESP.
Astronomy and Astrophysics
Astrophysics
23
Accretion Disks, Cataclysmic Variables, Image Analysis, Image Processing, Brightness, Dwarf Novae, Eclipsing Binary Stars, Image Reconstruction, Light Curve
Scientific paper
A program has been developed to map the accretion disk brightness distribution in cataclysmic variables from their eclipse light curves. This program is an alternative implementation of the Eclipse Mapping Method (Horne, 1985), employing penalty function optimization techniques with a conjugate-gradient algorithm. To improve the method's performance when faced with relatively low signal-to noise input data the combination of chi-squared was used, and another statistic (T prime), which measures the correlation between the residuals and the inverse of the measured fluxes, as the statistical consistency check. This avoids the occurrence of biased residuals in the light curve, present when the chi-squared statistic alone is used. This method has been applied to map the accretion disk brightness in V4140 Sgr (NSV 12615).
Baptista Raymundo
Steiner Joao Evangelista
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