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

V. P. Grinin, T. V. Demidova, N. Ya. Sotnikova

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

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 ou
Original languageEnglish
Pages (from-to)808-815
JournalAstronomy Letters
Volume36
Issue number11
DOIs
StatePublished - 2010

Keywords

  • young binary systems
  • extinction modulation
  • activity cycles of UX Ori stars

Cite this

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Modulation of circumstellar extinction in a young binary system with a low-mass companion in a noncoplanar orbit. / Grinin, V. P.; Demidova, T. V.; Sotnikova, N. Ya.

In: Astronomy Letters, Vol. 36, No. 11, 2010, p. 808-815.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Sotnikova, N. Ya.

PY - 2010

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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

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KW - activity cycles of UX Ori stars

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