ASTR 1102 Lecture 13 Notes

  • SLIDE 3

    • star - glowing ball of gas


  • SLIDE 5

    • distance determination - biggest question


  • SLIDE 6

    • brightness is determined by distance, luminosity, surface area, and interstellar dust


  • SLIDE 7

    • distance determination is the hardest problem (best solution: Parallax)


  • SLIDE 8

    • parallax - stars aren’t going to look the same at different times (perspective)


  • SLIDE 22

    • flux: power emerging from 1m² of the surface of a star (Stefan-Boltzmann’s Law)

    • luminosity: total power emerging from a star’s surface

    • brightness: light measured from crossing Earth


  • SLIDE