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Orbital motions and light curves of young binaries XZ Tau and VY Tau | A.V. Dodin
; N.V. Emelyanov
; A.V. Zharova
; S.A. Lamzin
; E.V. Malogolovets
; J.M. Roe
; | Date: |
16 Sep 2015 | 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 $i
lesssim 47^o$ 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 $Delta B > 2$ 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. | Source: | arXiv, 1509.4966 | Services: | Forum | Review | PDF | Favorites |
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