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Eclipsing binaries among high-mass stars

Published online by Cambridge University Press:  25 February 2014

A. Barr Domínguez ,
R. Chini ,
F. Pozo Nuñez ,
M. Haas ,
M. Hackstein ,
R. Lemke  and
M. Murphy
A. Barr Domínguez
Affiliation:
Astronomisches Institut, Ruhr–Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
R. Chini
Affiliation:
Astronomisches Institut, Ruhr–Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany Instituto de Astronomía, Universidad Católica del Norte, Avenida Angamos 0610, Casilla 1280 Antofagasta, Chile
F. Pozo Nuñez
Affiliation:
Astronomisches Institut, Ruhr–Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
M. Haas
Affiliation:
Astronomisches Institut, Ruhr–Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
M. Hackstein
Affiliation:
Astronomisches Institut, Ruhr–Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
R. Lemke
Affiliation:
Astronomisches Institut, Ruhr–Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
M. Murphy
Affiliation:
Instituto de Astronomía, Universidad Católica del Norte, Avenida Angamos 0610, Casilla 1280 Antofagasta, Chile
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Abstract

We present the first results of a comprehensive photometric O-star survey performed with a robotic twin refractor at the Universitätssternwarte Bochum located near Cerro Armazones in Chile. For three high-mass stars, Pismis 24-1, CPD − 51∘ 8946, and HD 319702, we determined the period through the Lafler-Kinman algorithm and modelled the light curves within the framework of the Roche geometry. We introduce a newly discovered eclipsing high-mass binary HD 319702 that shows well-defined eclipses favouring a detached configuration with a period of 2.0 days and an orbital inclination of 67.5∘. Combining our photometric result with the primary spectral type O8 III(f) (T1 = 34 000 K) we derive a temperature of T2 = 25 200 K for the secondary component.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 64: Setting a New Standard in the Analysis of Binary Stars , 2013 , pp. 379 - 380
Copyright
© EAS, EDP Sciences, 2014

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References

Barr Domínguez, A., Chini, R., Pozo Nuñez, F., et al., 2013, A&A, 557, A13
Chini, R., Barr, A., Buda, L.S., et al., 2013, Centr. Eur. Astrophys. Bull., 37, 295
Haas, M., Hackstein, M., Ramolla, M., et al., 2012, AN, 333, 706
Sota, A., Maíz-Apellániz, J., Walborn, N.R., & Shida, R.Y., 2008, RMxAC, 33, 56
Wilson, R.E., & Devinney, E.J., 1971, ApJ, 166, 605CrossRef