Spindown of massive main sequence stars in the Milky Way

Abstract

Context. We need to understand the spin evolution of massive stars to compute their internal rotationally induced mixing processes, isolate effects of close binary evolution, and predict the rotation rates of white dwarfs, neutron stars and black holes. Aims. We discuss the spindown of massive main sequence stars imposed by stellar winds. Methods. We use detailed grids of single star evolutionary models to predict the distribution of the surface rotational velocities of core-hydrogen burning Galactic massive stars as function of their mass and evolutionary state. We then compare the spin properties of our synthetic populations with appropriately selected sub-samples of Galactic main sequence OB-type stars extracted from the IACOB survey. Results. We find that below $\sim 40M_{\odot }$, observations and models agree in finding that the surface rotational velocities of Galactic massive stars remain relatively constant during their main sequence evolution. The more massive stars in the IACOB sample appear to spin down less than predicted, while our updated angular momentum loss prescription predicts an enhanced spindown. Furthermore, the observations show a population of fast rotators, with $v\sin I\gtrsim 200$ km/s persisting for all ages, which is not reproduced by our synthetic single star populations. Conclusions. We conclude that the wind-induced spindown of massive main sequence stars is yet to be fully understood, and that close binary evolution might significantly contribute to the fraction of rapid rotators in massive stars.

12 pages, 10 figures. Submitted to A&A

References in corpus (33)

• Binary interaction dominates the evolution of massive stars
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• Pre-Supernova Evolution of Massive Single and Binary Stars
• The empirical metallicity dependence of the mass-loss rate of O- and early B-type stars
• The evolution of rotating very massive stars with LMC composition
• The VLT-FLAMES survey of massive stars: Mass loss and rotation of early-type stars in the SMC
• The spectroscopic Hertzsprung-Russell diagram
• The IACOB project: III. New observational clues to understand macroturbulent broadening in massive O- and B-type stars
• A Temporary Epoch of Stalled Spin-Down for Low-Mass Stars: Insights from NGC 6811 with Gaia and Kepler
• Theory and Diagnostics of Hot Star Mass Loss
• Weakened magnetic braking supported by asteroseismic rotation rates of Kepler dwarfs
• The metallicity dependence of envelope inflation in massive stars
• Grids of stellar models with rotation VI: Models from 0.8 to 120 $M_{\odot }$ at a metallicity Z = 0.006
• Rotating massive O stars with non-spherical 2D winds
• A census of massive stars in NGC 346. Stellar parameters and rotational velocities
• 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
• The IACOB project. VII. The rotational properties of Galactic massive O-type stars revisited
• Modeling the early evolution of massive OB stars with an experimental wind routine
• The IACOB project. VI. On the elusive detection of massive O-type stars close to the ZAMS
• Evidence of magnetic field decay in massive main-sequence stars
• The Single Star Path to Be Stars
• Further Evidence of Modified Spin-down in Sun-like Stars: Pileups in the Temperature-Period Distribution
• Critical angular velocity and anisotropic mass loss of rotating stars with radiation-driven winds
• A study of the effect of rotational mixing on massive stars evolution: surface abundances of Galactic O7-8 giant stars
• Stellar Rotation: A Clue to the Origin of High Mass Stars?
• The IACOB project IX. Building a modern empirical database of Galactic O9-B9 supergiants: sample selection, description, and completeness
• The evolution of single B-type stars with a large angular momentum content
• X-Shooting ULLYSES: Massive Stars at low metallicity IX: Empirical constraints on mass-loss rates and clumping parameters for OB supergiants in the Large Magellanic Cloud
• Metallicity dependence of turbulent pressure and macroturbulence in stellar envelopes
• The IACOB project XI. No increase of mass-loss rates over the bistability region
• Dynamics of the radiative envelope of rapidly rotating stars: Effects of spin-down driven by mass loss
• A model of anisotropic winds from rotating stars for evolutionary calculations
• Exploring the Stellar Rotation of Early-type Stars in the LAMOST Medium-resolution Survey. III. Evolution

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