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Cited by 87Stellar, planetary, and galactic studiesSolar and Space Plasma DynamicsAstrophysics and Star Formation Studies

MAGNETO-THERMOHALINE MIXING IN RED GIANTS

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Denissenkov, Pavel A., Pinsonneault, Marc, MacGregor, Keith B.·2009·The Astrophysical Journal
DOI 10.1088/0004-637x/696/2/1823
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Abstract

We revise a magnetic buoyancy model that has recently been proposed as a mechanism for extra mixing in the radiative zones of low-mass red giants. The most important revision is our accounting of the heat exchange between rising magnetic flux rings and their surrounding medium. This increases the buoyant rising time by five orders of magnitude; therefore, the number of magnetic flux rings participating in the mixing has to be increased correspondingly. On the other hand, our revised model takes advantage of the fact that the mean molecular weight of the rings formed in the vicinity of the hydrogen burning shell has been reduced by 3 He burning. This increases their thermohaline buoyancy (hence, decreases the total ring number) considerably, making it equivalent to the pure magnetic buoyancy produced by a frozen-in toroidal field with B φ ≈ 10 MG. We emphasize that some toroidal field is still needed for the rings to remain cohesive while rising. Besides, this field prevents the horizontal turbulent diffusion from eroding the μ contrast between the rings and their surrounding medium. We propose that the necessary toroidal magnetic field is generated by differential rotation of the radiative zone that stretches a preexisting poloidal field around the rotation axis, and that magnetic flux rings are formed as a result of its buoyancy-related instability.

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  • Magnetic fields produced by differential rotation just below the convective envelope can produce a toroidal field, and mixing by magnetic buoyancy has been investigated.

    “One obvious contender is magnetic fields (Busso et al. 2007) produced by differential rotation just below the convective envelope. This can produce a toroidal field and mixing by magnetic buoyancy has been investigated by various authors (e.g., Nordhaus et al. 2008; Denissenkov et al. 2009).”

    From The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014) · cites this paper as Denissenkov et al. 2009

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Cited by

Sorted by citations

Authors
Denissenkov, P. A., Pinsonneault, M., & MacGregor, K. B.
Affiliations
  • St Petersburg University (RU)
  • The Ohio State University (US)
  • NSF National Center for Atmospheric Research (US)
ORCID
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
2009-04-27
Volume
696
Issue
2
Pages
1823-1833
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.1088/0004-637x/696/2/1823
OpenAlex
W2074655277
Cited by
87
References
0
Citations by year
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FWCI
4.71
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Solar and Space Plasma Dynamics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
Keywords
red giants, magnetic buoyancy, thermohaline mixing, radiative zone, toroidal magnetic field, differential rotation, poloidal magnetic field, helium burning, average molecular weight, heat exchange, turbulent diffusion, stellar convection

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