Classical Algol systems (invited review)

Budding, E.

doi:10.1007/bf00651132

Cited by 4 publications

(2 citation statements)

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“…The primaries of Algols, in general, lie close to the same main sequence (MS) mass luminosity relationship satisfied by normal single stars (Budding 1986). Considerations of the primary's basic parameters are thus not so dependent on whether the system is semi-detached or not.…”

Section: Information Limit Optimization Technique (Ilot)mentioning

confidence: 70%

The close binary system EG Cephei

Erdem¹,

Budding

Demirçan

et al. 2005

Astron. Nachr.

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Abstract. New light curves and available times of minima of a β Lyr system EG Cep were analysed to deduce more information on the nature of the system. The main U-shaped (O − C) variation was interpreted in terms of the mass transfer and mass loss in the system. The same variation was also considered as a part of a sinusoidal variation and thus interpreted in terms of a light-time effect due to an unseen component in the system. New B and V light curves were analyzed with different fitting procedures, and there is general agreement that both stars must be very close to each other and to stability limits. A model that fits all the data well has a near main sequence primary and a secondary star that is overflowing matter towards it. This secondary is also reasonably close to main sequence conditions. The configuration thus appears to be a (relatively uncommon) 'Case A' type evolving Algol and raises interesting questions about such interactive evolution and potentially useful tests of theory.

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Section: Information Limit Optimization Technique (Ilot)mentioning

confidence: 70%

The close binary system EG Cephei

Erdem¹,

Budding

Demirçan

et al. 2005

Astron. Nachr.

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“…Okazaki, 1978), a problem remains that Algols with very low mass ratios can exist at low periods. R CMa is in a very odd position in this respect (Budding, 1985). Edalati et α/.…”

Section: • Introductionmentioning

confidence: 99%

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

Edalati

Banks

Budding

1992

Symp. - Int. Astron. Union

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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.

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