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Observational data on rotation of Ap stars suggest that the bulk of their rotation rates form a separate Maxwellian distribution with an average value 3-4 times lower than the normal star distribution. No evidences for a significant angular…

Astrophysics · Physics 2007-05-23 K. Stepien

The physical mechanisms that set the initial rotation rates in massive stars are a crucial unknown in current star formation theory. Observations of young, massive stars provide evidence that they form in a similar fashion to their low-mass…

Solar and Stellar Astrophysics · Physics 2015-06-03 Anna L. Rosen , Mark R. Krumholz , Enrico Ramirez-Ruiz

There is an intricate relationship between the organization of large-scale magnetic fields by a stellar dynamo and the rate of angular momentum loss due to magnetized stellar winds. An essential ingredient for the operation of a large-scale…

We present theoretical models of the angular momentum evolution of very low mass stars (0.1 - 0.5 M_sun) and solar analogues (0.6 - 1.1 M_sun). We investigate the effect of rotation on the effective temperature and luminosity of these…

Astrophysics · Physics 2009-07-28 Alison Sills , M. H. Pinsonneault , D. M. Terndrup

Stellar rotation significantly shapes the evolution of massive stars, yet the interplay of mass and metallicity remains elusive, limiting our capacity to construct accurate stellar evolution models and to better estimate the impact of…

Solar and Stellar Astrophysics · Physics 2024-09-11 Weijia Sun , Cristina Chiappini

While magnetic fields have long been considered to be important for the evolution of magnetic non-degenerate stars and compact stars, it has become clear in recent years that actually all of the stars are deeply affected. This is…

Solar and Stellar Astrophysics · Physics 2021-02-03 Koh Takahashi , Norbert Langer

We study the predicted rotational evolution of solar-type stars from the pre-main sequence to the solar age with 1D rotating evolutionary models including physical ingredients. We computed rotating evolution models of solar-type stars…

Solar and Stellar Astrophysics · Physics 2016-03-02 Louis Amard , Ana Palacios , Corinne Charbonnel , Florian Gallet , Jérôme Bouvier

We critically examine the constraints on internal angular momentum transport which can be inferred from the spin down of open cluster stars. The rotation distribution inferred from rotation velocities and periods are consistent for larger…

Solar and Stellar Astrophysics · Physics 2014-11-20 Pavel A. Denissenkov , Marc Pinsonneault , Donald M. Terndrup , Grant Newsham

Magnetic braking causes the spin-down of single stars as they evolve on the main sequence. Models of magnetic braking can also explain the evolution of close binary systems, including cataclysmic variables. The well-known period gap in the…

Solar and Stellar Astrophysics · Physics 2012-02-24 G. A. J. Hussain

We examine the early angular momentum history of stars in young clusters via 197 photometric periods in fields flanking the Orion Nebula Cluster (ONC), 81 photometric periods in NGC 2264, and 202 measurements of v sin i in the ONC itself.…

Astrophysics · Physics 2009-11-07 L. M. Rebull , S. C. Wolff , S. E. Strom , R. B. Makidon

This study examines the relationship between magnetic field complexity and mass and angular momentum losses. Observations of open clusters have revealed a bimodal distribution of the rotation periods of solar-like stars that has proven…

Solar and Stellar Astrophysics · Physics 2016-11-15 Cecilia Garraffo , Jeremy J. Drake , Ofer Cohen

Weakened magnetic braking (WMB) was originally proposed in 2016 to explain anomalously rapid rotation in old field stars observed by the Kepler mission. The proximate cause was suggested to be a transition in magnetic morphology from larger…

The model of magnetic braking of solar rotation considered by Charbonneau & MacGregor (1993) has been modified so that it is able to reproduce for the first time the rotational evolution of both the fastest and slowest rotators among…

Solar and Stellar Astrophysics · Physics 2015-05-18 Pavel A. Denissenkov

Only indirect evidence of the role of magnetic braking in regulating gravitational collapse and the formation of circumstellar disks was found from observational work, such as compact disk sizes and the launching of high-velocity collimated…

Solar and Stellar Astrophysics · Physics 2024-04-18 N. Añez-Lopez , U. Lebreuilly , A. Maury , P. Hennebelle

The present work is based on a description for the angular mometum loss rate due to magnetic braking for main-sequence stars on the relationship between stellar rotation and age. In general, this loss rate denoted by $\mathrm dJ/\mathrm dt$…

Solar and Stellar Astrophysics · Physics 2015-09-30 D. B. de Freitas , F. J. Cavalcante , B. B. Soares , J. R. P. Silva

It has long been known that solar-type stars undergo significant spin-down, via magnetic braking, during their Main-Sequence lifetimes. However, magnetic braking only operates on the surface layers; it is not yet completely understood how…

Solar and Stellar Astrophysics · Physics 2015-06-18 Rosie Oglethorpe , Pascale Garaud

Planets orbiting young, solar-type stars are embedded in a more energetic environment than that of the solar neighbourhood. They experience harsher conditions due to enhanced stellar magnetic activity and wind shaping the secular evolution…

Solar and Stellar Astrophysics · Physics 2025-07-22 S. Bellotti , T. Lueftinger , S. Boro Saikia , C. P. Folsom , P. Petit , J. Morin , M. Gudel , J. -F. Donati , E. Alecian

The aim of this work is to investigate rotation profile of solar-like stars with magnetic fields. A diffusion coefficient of magnetic angular momentum transport is deduced. Rotating stellar models with different mass are computed under the…

Astrophysics · Physics 2008-12-23 Wuming Yang , Shaolan Bi

This study focuses on stars with masses above the Kraft break in the \textit{Kepler} field. Their rotational angular momenta are essentially the same as those at the zero-age main sequence. The angular momentum dissipation experienced by…

Astrophysics of Galaxies · Physics 2025-07-22 Yu-Fu Shen , Yan Xu , Yi-Bo Wang , Xiu-Lin Huang , Xing-Xing Hu , Qi Yuan

Aims: We study the acceleration of the stellar winds of rapidly rotating low mass stars and the transition between the slow magnetic rotator and fast magnetic rotator regimes. We aim to understand the properties of stellar winds in the fast…

Solar and Stellar Astrophysics · Physics 2017-02-01 C. P. Johnstone