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The Sun and the stars

The Sun's structure, its activity cycle and the nuclear fusion that powers it, then stellar spectra and classification, masses and sizes, and how distances to the stars are measured.

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  • Recto active region
    Verso an area on the Sun where magnetic fields are concentrated; sunspots, prominences, flares, and CMEs all tend to occur in active regions
  • Recto apparent brightness
    Verso a measure of the amount of light received by Earth from a star or other object—that is, how bright an object appears in the sky, as contrasted with its luminosity
  • Recto aurora
    Verso light radiated by atoms and ions in the ionosphere excited by charged particles from the Sun, mostly seen in the magnetic polar regions
  • Recto binary stars
    Verso two stars that revolve about each other
  • Recto brown dwarf
    Verso an object intermediate in size between a planet and a star; the approximate mass range is from about 1/100 of the mass of the Sun up to the lower mass limit for self-sustaining nuclear reactions, which is about 0.075 the mass of the Sun; brown dwarfs are capable of deuterium fusion, but not hydrogen fusion

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Creative Commons Attribution 4.0 International CC-BY-4.0
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Source : https://openstax.org/books/astronomy/pages/preface — Licence : Creative Commons Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/)
Source
OpenStax — Astronomy (first edition)
Récupéré le
Thème
Astronomie
Langue
English
Version
3
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