Modulation of circumstellar extinction in a young binary system with a low-mass companion in a noncoplanar orbit |
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| Authors: | V P Grinin T V Demidova N Ya Sotnikova |
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| Institution: | 1.Sobolev Astronomical Institute,St. Petersburg State University,St. Petersburg,Russia;2.Pulkovo Astronomical Observatory,Russian Academy of Sciences,St. Petersburg,Russia |
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| Abstract: | We consider a model of cyclic brightness variations in a young star with a low-mass (q = M
2/M
1 ≤ 0.1) companion that accretes matter from the remnants of a protostellar cloud (circumbinary disk). We assume that the orbit
of the companion is circular and that its plane does not coincide with the disk plane. We have computed grids of hydrodynamic
models for such a binary by the SPH method based on which we have investigated the circumstellar extinction variations produced
by the streams of matter and density waves excited in the circumbinary disk by the orbital motion of the companion. We show
that, depending on the inclination and orientation of the binary’s line of nodes relative to the observer, the brightness
of the primary component can undergo various (in shape and depth) oscillations with a period equal to the orbital one. In
contrast to the models with coplanar circular orbits, the accretion rate onto the components of a binary with a noncoplanar
orbit depends on the orbital phase. The results of our computations can be used to study the cyclic activity of UX Ori stars
and young eclipsing binaries with anomalously long eclipses. |
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