274 citations · 2.7k across the 93 of their papers we have counts for
10 papers · 1 filter
Wind-envelope interaction as the origin of the slow cyclic brightness variations of luminous blue variables
Luca Grassitelli, Norbert Langer, Jonathan Mackey +4
Luminous blue variables (LBVs) are hot, very luminous massive stars displaying large quasi-periodic variations in brightness, radius,and photospheric temperature, on timescales of…
Subsonic structure and optically thick winds from Wolf--Rayet stars
Luca Grassitelli, Norbert Langer, Nathan J. Grin +3
Wolf-Rayet star's winds can be so dense and so optically thick that the photosphere appears in the highly supersonic part of the outflow, veiling the underlying subsonic part of th…
Supergiants and their shells in young globular clusters
Dorottya Szécsi, Jonathan Mackey, Norbert Langer
Anomalous surface abundances are observed in a fraction of the low-mass stars of Galactic globular clusters, that may originate from hot-hydrogen-burning products ejected by a prev…
Interacting supernovae from photoionization-confined shells around red supergiant stars
Jonathan Mackey, Shazrene Mohamed, Vasilii V. Gvaramadze +5
Betelgeuse, a nearby red supergiant, is a runaway star with a powerful stellar wind that drives a bow shock into its surroundings. This picture has been challenged by the discovery…
On the stability of bow shocks generated by red supergiants: the case of IRC-10414
D. M. -A. Meyer, V. V Gvaramadze, N. Langer +3
In this Letter, we explore the hypothesis that the smooth appearance of bow shocks around some red supergiants (RSGs) might be caused by the ionization of their winds by external s…
3D Smoothed Particle Hydrodynamics Models of Betelgeuse's Bow Shock
Shazrene Mohamed, Jonathan Mackey, Norbert Langer
Betelgeuse, the bright red supergiant (RSG) in Orion, is a runaway star. Its supersonic motion through the interstellar medium has resulted in the formation of a bow shock, a comet…
Numerical models for the circumstellar medium around Betelgeuse
Jonathan Mackey, Shazrene Mohamed, Hilding R. Neilson +2
The nearby red supergiant (RSG) Betelgeuse has a complex circumstellar medium out to at least 0.5 parsecs from its surface, shaped by its mass-loss history within the past 0.1 Myr,…
Zeta Oph and the weak-wind problem
V. V. Gvaramadze, N. Langer, J. Mackey
Mass-loss rate, , is one of the key parameters affecting evolution and observational manifestations of massive stars, and their impact on the ambient medium. Despite its i…
Double bow shocks around young, runaway red supergiants: application to Betelgeuse
Jonathan Mackey, Shazrene Mohamed, Hilding R. Neilson +2
A significant fraction of massive stars are moving supersonically through the interstellar medium (ISM), either due to disruption of a binary system or ejection from their parent s…
3D Simulations of Betelgeuse's Bow Shock
S. Mohamed, J. Mackey, N. Langer
Betelgeuse, the bright, cool red supergiant in Orion, is moving supersonically relative to the local interstellar medium. The star emits a powerful stellar wind which collides with…