Brightness oscillations in models of young binary systems with low-mass secondary components |
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Authors: | T V Demidova V P Grinin N Ya Sotnikova |
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Institution: | 1.Pulkovo Astronomical Observatory,Russian Academy of Sciences,St. Petersburg,Russia;2.Sobolev Astronomical Institute,St. Petersburg State University,St. Petersburg,Russia |
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Abstract: | We consider a model for the cyclic brightness variations of a young star with a low-mass companion that accretes matter from
the remnants of a protostellar cloud. At small inclinations of the binary orbit to the line of sight, the streams of matter
and the density waves excited in the circumbinary disk can screen the primary component of the binary from the observer. To
study these phenomena, we have computed grids of hydrodynamic models for binary systems by the SPH method based on which we
have calculated the phase light curves for the different orientations of the orbit. The model parameters were varied within
the following ranges: the component mass ratio q = 0.01–0.1 and the eccentricity e = 0–0.5. We adopted optical grain characteristics typical of circumstellar dust. Our computations have shown that the brightness
oscillations with orbital phase can have a complex structure. The amplitudes and shapes of the light curves depend strongly
on the inclination of the binary orbit and its orientation relative to the observer and on the accretion rate. The results
of our computations are used to analyze the cyclic activity of UX Ori stars. |
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