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Orbital motions and light curves of young binaries XZ Tau and VY Tau

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Abstract

The results of our speckle interferometric observations of young binaries VY Tau and XZ Tau are presented. For the first time, we found a relative displacement of VY Tau components as well as a preliminary orbit for XZ Tau. It appeared that the orbit is appreciably non-circular and is inclined by i ≲ 47◦ from the plane of the sky. It means that the rotation axis of XZ Tau A and the axis of its jet are significantly non-perpendicular to the orbital plane. We found that the average brightness of XZ Tau had been increasing from the beginning of the last century up to the mid-thirties and then it decreased by ΔB > 2 mag. The maximal brightness has been reached significantly later on the time of periastron passage. The total brightness of XZ Tau’s components varied in a non-regular way from 1970 to 1985 when eruptions of hot gas from XZ Tau A presumably had occurred. In the early nineties the variations became regular following which a chaotic variability had renewed. We also report that a flare activity of VY Tau has resumed after 40 yr pause, parameters of the previous and new flares are similar, and the flares are related with the A component.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Moscow M. V. Lomonosov State University, Universitetskij pr. 13, 119992, Moscow, Russia

    A. V. Dodin, N. V. Emelyanov, A. V. Zharova & S. A. Lamzin

  2. Special Astrophysical Observatory, Nizhnii Arkhyz, 369167, Karachai-Cherkesia, Russia

    E. V. Malogolovets

  3. AAVSO, PO Box 174, Bourbon, MO, 65441, USA

    J. M. Roe

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  1. A. V. Dodin
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  2. N. V. Emelyanov
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  3. A. V. Zharova
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  4. S. A. Lamzin
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  5. E. V. Malogolovets
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  6. J. M. Roe
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Correspondence to S. A. Lamzin.

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Original Russian Text © A.V. Dodin, N.V. Emelyanov, A.V. Zharova, S.A. Lamzin, E.V. Malogolovets, J.M. Roe, 2016, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2016, Vol. 42, No. 1, pp. 33–45.

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Dodin, A.V., Emelyanov, N.V., Zharova, A.V. et al. Orbital motions and light curves of young binaries XZ Tau and VY Tau. Astron. Lett. 42, 29–40 (2016). https://doi.org/10.1134/S1063773716010035

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