# MAGNETIC BRAKING OF STELLAR CORES IN RED GIANTS AND SUPERGIANTS

@article{Maeder2014MAGNETICBO,
title={MAGNETIC BRAKING OF STELLAR CORES IN RED GIANTS AND SUPERGIANTS},
author={Andre Maeder and Georges Meynet},
journal={The Astrophysical Journal},
year={2014},
volume={793}
}
• Published 6 August 2014
• Physics
• The Astrophysical Journal
Magnetic configurations, stable on the long term, appear to exist in various evolutionary phases, from main-sequence stars to white dwarfs and neutron stars. The large-scale ordered nature of these fields, often approximately dipolar, and their scaling according to the flux conservation scenario favor a fossil field model. We make some first estimates of the magnetic coupling between the stellar cores and the outer layers in red giants and supergiants. Analytical expressions of the truncation…
29 Citations
ROTATION OF GIANT STARS
• Physics
• 2015
The internal rotation of post-main sequence stars is investigated, in response to the convective pumping of angular momentum toward the stellar core, combined with a tight magnetic coupling between
Strong magnetic field generated by the extreme oxygen-rich red supergiant VY Canis Majoris
• Physics
• 2017
Evolved stars experience high mass-loss rates forming thick circumstellar envelopes (CSEs). The circumstellar material is made of the result of stellar nucleosynthesis and, as such, plays a crucial
Magnetic Field Generation in Stars
• Physics
• 2015
Enormous progress has been made on observing stellar magnetism in stars from the main sequence (particularly thanks to the MiMeS, MAGORI and BOB surveys) through to compact objects. Recent data have
Angular momentum redistribution by mixed modes in evolved low-mass stars. I. Theoretical formalism
• Physics
• 2015
The detection of mixed modes in subgiants and red giants by the CoRoT and Kepler space-borne missions allows us to investigate the internal structure of evolved low-mass stars, from the end of the
Seismic evidence for a weak radial differential rotation in intermediate-mass core helium burning stars
• Physics
• 2015
The detection of mixed modes that are split by rotation in Kepler red giants has made it possible to probe the internal rotation profiles of these stars, which brings new constraints on the transport
ON OBLIQUELY MAGNETIZED AND DIFFERENTIALLY ROTATING STARS
• Physics
• 2015
We investigate the interaction of differential rotation and a misaligned magnetic field. The incompressible magnetohydrodynamic equations are solved numerically for a free-decay problem. In the
Stellar Physics with High-Resolution UV Spectropolarimetry
• Physics
• 2019
Current burning issues in stellar physics, for both hot and cool stars, concern their magnetism. In hot stars, stable magnetic fields of fossil origin impact their stellar structure and circumstellar
The effects of surface fossil magnetic fields on massive star evolution: I. Magnetic field evolution, mass-loss quenching, and magnetic braking
• Physics
Monthly Notices of the Royal Astronomical Society
• 2019
Surface magnetic fields have a strong impact on stellar mass loss and rotation and, as a consequence, on the evolution of massive stars. In this work, we study the influence of an evolving dipolar
Red giant stars: from mixed modes to angular momentum
Solar-like oscillations are ubiquitous to low-mass stars from the main-sequence to the red-giant branch as demonstrated by the space-borne missions CoRoT and Kepler. Understanding the physical
Angular momentum redistribution by mixed modes in evolved low-mass stars. II. Spin-down of the core of red giants induced by mixed modes
• Physics
• 2015
The detection of mixed modes in subgiants and red giants by the CoRoT and \emph{Kepler} space-borne missions allows us to investigate the internal structure of evolved low-mass stars. In particular,

## References

SHOWING 1-10 OF 42 REFERENCES
Fast core rotation in red-giant stars as revealed by gravity-dominated mixed modes
• Physics
Nature
• 2012
An increasing rotation rate from the surface of the star to the stellar core in the interiors of red giants is reported using the rotational frequency splitting of recently detected ‘mixed modes’, which confirms the theoretical prediction of a steep gradient in the rotation profile towards the deep stellar interior.
A fossil origin for the magnetic field in A stars and white dwarfs
• Physics, Geology
Nature
• 2004
Numerical simulations show that stable magnetic field configurations, with properties agreeing with those observed, can develop through evolution from arbitrary, unstable initial fields, establishing fossil fields as the natural, unifying explanation for the magnetism of all these stars.
Presupernova evolution of differentially rotating massive stars including magnetic fields
• Physics
• 2004
As a massive star evolves through multiple stages of nuclear burning on its way to becoming a supernova, a complex, differentially rotating structure is set up. Angular momentum is transported by a
SEISMIC EVIDENCE FOR A RAPIDLY ROTATING CORE IN A LOWER-GIANT-BRANCH STAR OBSERVED WITH KEPLER
• Physics
• 2012
Rotation is expected to have an important influence on the structure and the evolution of stars. However, the mechanisms of angular momentum transport in stars remain theoretically uncertain and very
White dwarf spins from low mass stellar evolution models
• Physics, Geology
• 2008
Context. The prediction of the spins of the compact remnants is a fundamental goal of the theory of stellar evolution. Aims. Here, we confront the predictions for white dwarf spins from evolutionary
Massive star models with magnetic braking
• Physics
• 2010
Magnetic fields at the surface of a few early-type stars have been directly detected. These fields have magnitudes between a few hundred G up to a few kG. In one case, evidence of magnetic braking
Magnetic Fields of Degenerate Stars
Magnetic fields are ubiquitous in the universe and were known over three decades ago to range from � 1 J.LG in interstellar space up to about 30,000 G in nondegenerate magnetic stars (Parker 1 979).
Stellar evolution with rotation and magnetic fields. I. The relative importance of rotational and magnetic effects
• Physics
• 2003
We compare the current effects of rotation in stellar evolution to those of the magnetic field created by the Tayler instability. In stellar regions, where a magnetic field can be generated by the
Seismic constraints on the radial dependence of the internal rotation profiles of six Kepler subgiants and young red giants
• Physics
• 2014
Context. We still do not understand which physical mechanisms are responsible for the transport of angular momentum inside stars. The recent detection of mixed modes that contain the clear signature
Magnetic confinement of the solar tachocline: The oblique dipole
• Physics
• 2011
3D MHD global solar simulations coupling the turbulent convective zone and the radiative zone have been carried out. Essential features of the Sun such as differential rotation, meridional