Discovery of two short-period eclipsing binaries with active components.

Details Discovery of two short-period eclipsing binaries with active components. Discovery of two short-period eclipsing binaries with active components.

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...320..586c&link_type=abstract

Astronomy and Astrophysics, v.320, p.586-593

Astronomy and Astrophysics

Astrophysics

16

Stars: Activity, Stars: Late-Type, Stars: Variables, Binaries: Eclipsing, X-Rays: Stars, Techniques: Photometry

Scientific paper

We present high-precision UBV(RI)_c_ photometry as well as soft X-ray light curves for the visual triple system HD 9770 and the visual binary HD 195434, obtained at the European Southern Observatory and extracted from the ROSAT all-sky survey, respectively. The optical photometry revealed that in both systems one component is a very short-period eclipsing binary showing also BY Dra-type variability. We have computed accurate orbital periods, deduced approximate physical parameters, spectral classifications, distances and X-ray luminosities and identified which component of each visual system is responsible for the optical variability. Futhermore, we find that both systems are variable in X-rays, but no correlation with the optical variability is seen.

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