2004A&A...414.1043I -
Astronomy and Astrophysics, volume 414, 1043-1048 (2004/2-2)
High-speed photometry of the pre-cataclysmic binary HW Virginis and its orbital period change.
IBANOGLU C., CAKIRLI O., TAS G. and EVREN S.
Abstract (from CDS):
The broad band B and V light curves of the pre-cataclysmic eclipsing binary HW Vir were obtained. All the available eclipse timings, including the new ones, spanning 19 years were analyzed under the third-body hypothesis. The residuals between the observed and calculated times of mid-eclipse show a long-term sinusoidal variation. The analysis yields the parameters of the third-body orbit, as well as limiting mass for the tertiary object. The result of this analysis gives a light-time semi-amplitude of 112s, an orbital period of 18.8yr and an eccentricity of 0.12. The mass of the third star is below the theoretical threshold of 0.07M☉ for a hydrogen burning star. Its minimum mass is about 0.022M☉ and for a wide range of inclinations of third-body orbit, i.e. i ≥19°, the mass is smaller than 0.07M☉. Therefore, we suggest that the third star may be a brown dwarf candidate. Combining the semi-amplitudes of the radial velocities and the photometric light curve solution has allowed us to model the short-period detached binary HW Vir. The luminosity and radius of the dM companion are slightly larger than that given by low-mass models.
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Journal keyword(s):
stars: individual: HW Vir - stars: binaries: eclipsing - techniques: photometry
Simbad objects:
6
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