Magnetic mixing and the Arcturus problem

Details Magnetic mixing and the Arcturus problem Magnetic mixing and the Arcturus problem

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239..248h&link_type=abstract

Astrophysical Journal, Part 1, vol. 239, July 1, 1980, p. 248-252.

Astronomy and Astrophysics

Astrophysics

17

Interstellar Gas, Magnetic Stars, Magnetohydrodynamics, Main Sequence Stars, Stellar Evolution, Stellar Models, Abundance, Carbon, Nitrogen, Nuclear Fusion, Stellar Luminosity

Scientific paper

A model for main-sequence mixing driven by the buoyancy of magnetic flux tubes is proposed, and the effect of such a process on the CNO isotopes is investigated. Such a mixing scheme applied to a 2.0 solar mass model is used to predict the ratios N-14/N-15, O-16/O-17, O-16/O-18, and C/O for any observed combination of C-12/C-13 and C/N. Unlike meriodinal mixing, the penetration depth of magnetic mixing depends critically on the early history of the star. Therefore, for a given C-13 enhancement, the N-14 enhancement may vary making magnetic mixing a viable model both for stars with moderate C-13 and N-14 enhancement such as Beta Gem and for stars with a large C-13 enhancement and a low N-14 enhancement such as Alpha Boo.

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