Astronomy and Astrophysics, volume 557A, 13-13 (2013/9-1)
Eclipsing high-mass binaries. I. Light curves and system parameters for CPD -51°8946, PISMIS 24-1, and HD 319702.
BARR DOMINGUEZ A., CHINI R., POZO NUNEZ F., HAAS M., HACKSTEIN M., DRASS H., LEMKE R. and MURPHY M.
Abstract (from CDS):
We present the first results of a comprehensive photometric O-star survey performed with a robotic twin refractor at the Universitaetssternwarte Bochum located near Cerro Armazones in Chile. For three high-mass stars, Pismis24-1, CPD-51°8946, and HD319702, we determined the period through the Lafler-Kinman algorithm and modelled the light curves within the framework of the Roche geometry. For Pismis24-1, a previously known eclipsing binary, we provide the first light curves and determined a photometric period of 2.36 days together with an orbital inclination of 61.8°. The best-fitting model solution to the light curves suggests a detached configuration. With a primary temperature of T1=42520K we obtained the temperature of the secondary component as T2=41500K. The CPD-51°8946 system is another known eclipsing binary for which we present a revised photometric period of 1.96 days with an orbital inclination of 58.4°. The system probably has a semi-detached configuration and a mass ratio q=M1/M2=2.8. If we adopt a primary temperature of T1=34550K, we obtain T2=21500K for the secondary component. The HD319702 system is a newly discovered eclipsing binary member of the young open cluster NGC6334. The system 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=34000K) we derive a temperature of T2=25200K for the secondary component.
stars: fundamental parameters - stars: formation - binaries: eclipsing - binaries: spectroscopic - open clusters and associations: individual: NGC 6334 - open clusters and associations: individual: NGC 6357
VizieR on-line data:
<Available at CDS (J/A+A/557/A13): cpd5118i.dat cpd5118r.dat hd31970i.dat hd31970r.dat pis24i.dat pis24r.dat>
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