Stars

Stars: Physical Properties

• Apparent brightness
  data on the 125 (apparently) brightest stars
• Colors
  
  • Orion
  • Southern Ccross optical image, objective prism
  • filters: commonly used wavelength bands; a filter wheel
    
  • multiwavelength comparison: Plieades star cluster
• Luminosity
• Distance: parallax
  RECONS project data on the 100 nearest stars
  nearest stars mapped
  searchable database of nearby stars
  

The Hertzsprung-Russell Diagram

• real data: Hipparcos unlabelled, labelled
• observer's version (i.e., axes in observational units)
• theoretical version (i.e., axes in underlying physical units)

Stars: More Physical Properties

• Mass: from binary systems

  visual binaries: Mizar orbit

  spectroscopic binaries

• Mass-luminosity relation plotted for main sequence stars
• implications for HR diagram
  HR diagram comparison: nearest vs brightest (highest flux) stars