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Photometric Analysis of Wide and Narrow Hα Band Observations of R Canis Majoris

Published online by Cambridge University Press:  07 August 2017

M. Taghi Edalati ,
Timothy Banks  and
Edwin Budding
M. Taghi Edalati
Affiliation:
Physics and Astronomy Department, University of Nebraska, Lincoln, NE 68588, U.S.A. Physics Department, Victoria University of Wellington, P.O. Box 600, New Zealand
Timothy Banks
Affiliation:
Physics Department, School of Sciences, University of Ferdowski, Mashhad, Iran Carter Observatory, P.O. Box 2909, Wellington, New Zealand
Edwin Budding
Affiliation:
Physics Department, School of Sciences, University of Ferdowski, Mashhad, Iran Carter Observatory, P.O. Box 2909, Wellington, New Zealand

Abstract

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Wide and narrow Hα lightcurves of R CMa were analysed using Wilson-Devinney (WD) and Information Limit Optimisation Technique (ILOT) approaches. A range of mass ratios, tested by both methods, led to an optimal estimate of around 0.45, at variance with the spectroscopic value. The distortion on the light curve affects the modelling, and so, in a second fitting, this was represented by a ‘hot spot’, associated with mass transfer effects. A semi-detached configuration was then derived. This is supported by the form of the Hα index variation, which has also been modelled. Although thus appearing as a ‘classical Algol’ system, R CMa retains its inherent peculiarity of low mass ratio with low period, which cannot be reconciled with conservative evolution scenarios.

Type
Oral and Contributed Papers
Information
Symposium - International Astronomical Union , Volume 151: Evolutionary Processes in Interacting Binary Stars , 1992 , pp. 303 - 306
Copyright
Copyright © Kluwer 1992 

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