Three-dimensional hydrodynamical models of wind and outburst-related accretion in symbiotic systems

M. de Val-Borro, M. Karovska, D. D. Sasselov, J. M. Stone

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Gravitationally focused wind accretion in binary systems consisting of an evolved star with a gaseous envelope and a compact accreting companion is a possible mechanism to explain mass transfer in symbiotic binaries. We study the mass accretion around the secondary caused by the strong wind from the primary late-type component using global three-dimensional hydrodynamic numerical simulations during quiescence and outburst stages. In particular, the dependence of the mass accretion rate on the mass-loss rate, wind parameters and phases of wind outburst development is considered. For a typical wind from an asymptotic giant branch star with a mass-loss rate of 10−6 M☉ yr−1 and wind speeds of 20-50 km s−1, the mass transfer through a focused wind results in efficient infall on to the secondary. Accretion rates on to the secondary of 5-20 per cent of the mass-loss from the primary are obtained during quiescence and outburst periods where the wind velocity and mass-loss rates are varied, about 20-50 per cent larger than in the standard Bondi-Hoyle-Lyttleton approximation. This mechanism could be an important method for explaining observed accretion luminosities and periodic modulations in the accretion rates for a broad range of interacting binary systems.

Original languageEnglish (US)
Pages (from-to)3408-3417
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume468
Issue number3
DOIs
StatePublished - Jul 1 2017

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Accretion
  • Accretion discs
  • Binaries: symbiotic
  • Circumstellar matter
  • Methods: numerical
  • Stars: mass-loss

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