TY - JOUR

T1 - Modulation of circumstellar extinction in a young binary system with a low-mass companion in a noncoplanar orbit

AU - Grinin, V. P.

AU - Demidova, T. V.

AU - Sotnikova, N. Ya.

PY - 2010

Y1 - 2010

N2 - 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 ou

AB - 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 ou

KW - young binary systems

KW - extinction modulation

KW - activity cycles of UX Ori stars

U2 - 10.1134/S106377371011006X

DO - 10.1134/S106377371011006X

M3 - Article

VL - 36

SP - 808

EP - 815

JO - Astronomy Letters

JF - Astronomy Letters

SN - 1063-7737

IS - 11

ER -