7-11 July 2014
Africa/Johannesburg timezone
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Comparison of photometric and spectroscopic parameters of eclipsing contact binary stars

Presented by Ms. Patricia SKELTON on 8 Jul 2014 from 14:00 to 14:20
Type: Oral Presentation
Session: Astro
Track: Track D1 - Astrophysics

Abstract

To model an eclipsing contact (EC) binary star requires the temperature of at least one of the components, usually <i>T<sub>1</sub></i>, and the mass ratio <i>q</i>. Other parameters are determined by minimizing residuals between the model and phase-magnitude data. Rucinski <i>et</i> <i>al</i>. (2005) have pointed out that model solutions of EC stars obtained from photometric data are unreliable because the photometrically determined mass ratios are different to those determined from spectroscopic data. The temperatures determined from colour indices are also found to differ from those determined spectroscopically. Clearly, in order to produce reliable models of these stars requires a combination of photometric and spectroscopic data. Using the SpCCD spectrograph on the 1.9m telescope at the South African Astronomical Observatory in Sutherland, spectroscopic data were obtained for selected EC stars. The results of the observations and a comparison of the photometrically and spectroscopically determined temperatures and mass ratios are presented.

Award

Yes

Level

PhD

Supervisor

Professor D.P. Smits smitsdp@unisa.ac.za UNISA

Paper

Yes

Place

Room: D Les 203


Primary authors

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