22-30 July 2021
North-West University
Africa/Johannesburg timezone
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Bow shocks formed by massive runaway stars in 3D

29 Jul 2021, 12:30
Potchefstroom Campus (North-West University)

Potchefstroom Campus

North-West University

Oral Presentation Track D1 - Astrophysics Astrophysics


Katlego Ramalatswa (University of Cape Town)


Hyper-runaways are stars moving at supersonic speeds through the interstellar medium; they can be thought of as a subset of runaway stars but moving with velocities that are comparable to the Galactic escape velocity $(\sim 500\,$km/s). Because of the strong stellar winds and high space velocities, we expect massive (hyper)runaway stars to produce bow shocks. We use PLUTO, a magneto-hydrodynamics grid code, to simulate these bow shocks, performing axi-symmetric hydrodynamic simulations in 3-dimensions while including thermal conduction and detailed radiative cooling processes. In this talk we will present our results for a range of stellar velocities ($100 \leq v_{\rm star} \leq 500\,$km/s) and discuss the implications for potentially observing hyper-runaways.

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Primary author

Katlego Ramalatswa (University of Cape Town)


Prof. Shazrene Mohamed (SAAO)

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