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The Sun Through Time.

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  • 1Department of Astrophysics, University of Vienna, Türkenschanzstr. 17, 1180 Vienna, Austria.

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This summary is machine-generated.

Stellar magnetic activity evolves due to magnetized stellar winds removing angular momentum. Early stellar rotation, wind mass loss, and high-energy output vary, impacting their long-term evolution.

Keywords:
Stellar activity evolutionStellar mass-loss evolutionStellar rotationStellar spin-downStellar wind evolution

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Area of Science:

  • * Astrophysics
  • * Stellar physics
  • * Solar physics

Background:

  • * Stellar magnetic activity is driven by internal dynamos, influenced by convection and differential rotation.
  • * Magnetic fields are generated and evolve over time due to magnetized stellar winds removing angular momentum.
  • * This spin-down process leads to predictable magnetic field strengths for solar-mass stars around 700 million years (Myr).

Purpose of the Study:

  • * To summarize evolutionary trends in stellar rotation, mass loss via stellar winds, and high-energy output.
  • * To highlight the non-unique rotational evolution of stars before 700 Myr.
  • * To explain how initial conditions affect stellar wind and high-energy output evolution.

Main Methods:

  • * Analysis of observational data on stellar properties.
  • * Application of theoretical models of stellar evolution and magnetic dynamos.
  • * Synthesis of trends in stellar rotation, wind mass loss, and high-energy emissions.

Main Results:

  • * Stellar spin-down, driven by magnetized winds, causes magnetic activity to evolve.
  • * Before 700 Myr, stellar rotation periods are not uniquely determined by mass and age.
  • * Non-unique early rotation leads to variable evolution of stellar winds and high-energy output.

Conclusions:

  • * Stellar rotation and magnetic activity evolution are complex, especially in early stages.
  • * Initial rotation periods significantly influence the subsequent evolution of stellar winds and high-energy output.
  • * Understanding these early evolutionary phases is crucial for predicting stellar behavior over time.