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Eclipsing binaries among high-mass stars

Published online by Cambridge University Press:  25 February 2014

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
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
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