N-body simulations of stars escaping from the Orion nebula

Details N-body simulations of stars escaping from the Orion nebula N-body simulations of stars escaping from the Orion nebula

2004-01-22

arxiv.org/abs/astro-ph/0401451v1

Mon.Not.Roy.Astron.Soc. 350 (2004) 615

Astronomy and Astrophysics

Astrophysics

14 pages, 13 figures, 5 tables, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07673.x

We study the dynamical interaction in which the two single runaway stars AE Aurigae and mu Columbae and the binary iota Orionis acquired their unusually high space velocity. The two single runaways move in almost opposite directions with a velocity greater than 100 km/s away from the Trapezium cluster. The star iota Ori is an eccentric (e=0.8) binary moving with a velocity of about 10 km/s at almost right angles with respect to the two single stars. The kinematic properties of the system suggest that a strong dynamical encounter occurred in the Trapezium cluster about 2.5 Myr ago. Curiously enough, the two binary components have similar spectral type but very different masses, indicating that their ages must be quite different. This observation leads to the hypothesis that an exchange interaction occurred in which an older star was swapped into the original iota Orionis binary. We test this hypothesis by a combination of numerical and theoretical techniques, using N-body simulations to constrain the dynamical encounter, binary evolution calculations to constrain the high orbital eccentricity of iota Orionis and stellar evolution calculations to constrain the age discrepancy of the two binary components. We find that an encounter between two low eccentricity (0.4

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