stars evolution
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2019 ◽  
Vol 487 (3) ◽  
pp. 3904-3913 ◽  
Author(s):  
James MacDonald ◽  
Véronique Petit

ABSTRACT It has been suggested that the absence of macroturbulence in the atmosphere of NGC 1624−2 is due its strong magnetic field (the strongest known for a massive O star) suppressing convection in its outer layers, removing the mechanism thought responsible for the observed macroturbulence in stars with lower field strengths. Here, we develop and apply a criterion for a uniform magnetic field to suppress convection in stellar envelopes in which radiation pressure is a significant contributor to hydrostatic balance. We find upper mass limits of ∼55 and ∼30 M⊙ for magnetic suppression to be possible in zero-age main-sequence and terminal-age main-sequence stars, respectively. For evolved stars, magnetic suppression of convection can significantly alter the stars’ evolution. For NGC 1624−2, we find that a polar dipole strength of 16.5 ± 5.9 kG is required to suppress convection, in good agreement with the value ∼20 kG measured by spectropolarimetry.


New Astronomy ◽  
2018 ◽  
Vol 63 ◽  
pp. 48-60 ◽  
Author(s):  
Vladimir Lipunov ◽  
Victor Kornilov ◽  
Evgeny Gorbovskoy ◽  
Galina Lipunova ◽  
Daniil Vlasenko ◽  
...  

2017 ◽  
Vol 599 ◽  
pp. A30 ◽  
Author(s):  
F. Martins ◽  
S. Simón-Díaz ◽  
R. H. Barbá ◽  
R. C. Gamen ◽  
S. Ekström

2015 ◽  
Vol 449 (2) ◽  
pp. 1834-1844 ◽  
Author(s):  
P. M. Williams ◽  
P. A. Crowther ◽  
K. A. van der Hucht

2015 ◽  
Vol 447 (4) ◽  
pp. 3115-3129 ◽  
Author(s):  
S. Jones ◽  
R. Hirschi ◽  
M. Pignatari ◽  
A. Heger ◽  
C. Georgy ◽  
...  

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