3-D SPH simulations of colliding winds in eta Carinae

Details 3-D SPH simulations of colliding winds in eta Carinae 3-D SPH simulations of colliding winds in eta Carinae

2008-03-27

arxiv.org/abs/0803.3977v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, To be published in Proceedings of IAU Symposium 250: Massive Stars as Cosmic Engines, held in Kauai, Hawai

Scientific paper

10.1017/S1743921308020413

We study colliding winds in the superluminous binary eta Carinae by performing three-dimensional, Smoothed Particle Hydrodynamics (SPH) simulations. For simplicity, we assume both winds to be isothermal. We also assume that wind particles coast without any net external forces. We find that the lower density, faster wind from the secondary carves out a spiral cavity in the higher density, slower wind from the primary. Because of the phase-dependent orbital motion, the cavity is very thin on the periastron side, whereas it occupies a large volume on the apastron side. The model X-ray light curve using the simulated density structure fits very well with the observed light curve for a viewing angle of i=54 degrees and phi=36 degrees, where i is the inclination angle and phi is the azimuth from apastron.

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