SIMBAD references

2020MNRAS.493..518K - Mon. Not. R. Astron. Soc., 493, 518-535 (2020/March-3)

The effects of surface fossil magnetic fields on massive star evolution - II. Implementation of magnetic braking in MESA and implications for the evolution of surface rotation in OB stars.

KESZTHELYI Z., MEYNET G., SHULTZ M.E., DAVID-URAZ A., UD-DOULA A., TOWNSEND R.H.D., WADE G.A., GEORGY C., PETIT V. and OWOCKI S.P.

Abstract (from CDS):

The time evolution of angular momentum and surface rotation of massive stars are strongly influenced by fossil magnetic fields via magnetic braking. We present a new module containing a simple, comprehensive implementation of such a field at the surface of a massive star within the Modules for Experiments in Stellar Astrophysics (MESA) software instrument. We test two limiting scenarios for magnetic braking: distributing the angular momentum loss throughout the star in the first case, and restricting the angular momentum loss to a surface reservoir in the second case. We perform a systematic investigation of the rotational evolution using a grid of OB star models with surface magnetic fields (M* = 5-60 M☉, Ω/Ωcrit = 0.2-1.0, Bp = 1-20 kG). We then employ a representative grid of B-type star models (M* = 5, 10, 15 M☉, Ω/Ωcrit = 0.2, 0.5, 0.8, Bp = 1, 3, 10, 30 kG) to compare to the results of a recent self-consistent analysis of the sample of known magnetic B-type stars. We infer that magnetic massive stars arrive at the zero-age main sequence (ZAMS) with a range of rotation rates, rather than with one common value. In particular, some stars are required to have close-to-critical rotation at the ZAMS. However, magnetic braking yields surface rotation rates converging to a common low value, making it difficult to infer the initial rotation rates of evolved, slowly rotating stars.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: evolution - stars: magnetic field - stars: massive - stars: rotation

Simbad objects: 14

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2021.06.17-11:29:54

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