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• W3103261679 endingPage "A98" @default.
• W3103261679 startingPage "A98" @default.
• W3103261679 abstract "We developed angular momentum evolution models for 0.5 and 0.8 $M_{odot}$ stars. The parametric models include a new wind braking law based on recent numerical simulations of magnetised stellar winds, specific dynamo and mass-loss rate prescriptions, as well as core/envelope decoupling. We compare model predictions to the distributions of rotational periods measured for low mass stars belonging to star forming regions and young open clusters. Furthermore, we explore the mass dependence of model parameters by comparing these new models to the solar-mass models we developed earlier. Rotational evolution models are computed for slow, median, and fast rotators at each stellar mass. The models reproduce reasonably well the rotational behaviour of low-mass stars between 1 Myr and 8-10 Gyr, including pre-main sequence to zero-age main sequence spin up, prompt zero-age main sequence spin down, and early-main sequence convergence of the surface rotation rates. Fast rotators are found to have systematically shorter disk lifetimes than moderate and slow rotators, thus enabling dramatic pre-main sequence spin up. They also have shorter core-envelope coupling timescales, i.e., more uniform internal rotation. As to the mass dependence, lower mass stars require significantly longer core-envelope coupling timescale than solar-type ones, which results in strong differential rotation developing in the stellar interior on the early main sequence. Lower mass stars also require a weaker braking torque to account for their longer spin down timescale on the early main sequence, while they ultimately converge towards lower rotational velocities than solar-type stars on the longer term due to their reduced moment of inertia. We also find evidence that the mass-dependence of the wind braking efficiency may be related to a change of the magnetic topology in lower mass stars." @default.
• W3103261679 created "2020-11-23" @default.
• W3103261679 creator A5014513600 @default.
• W3103261679 creator A5089576682 @default.
• W3103261679 date "2015-05-01" @default.
• W3103261679 modified "2023-10-14" @default.
• W3103261679 title "Improved angular momentum evolution model for solar-like stars" @default.
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• W3103261679 doi "https://doi.org/10.1051/0004-6361/201525660" @default.
• W3103261679 hasPublicationYear "2015" @default.
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