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

The Life of a 1M_sun Star

• birth in molecular clouds
• 1M_sun animated HR diagram
• birth and youth: protostar
• adulthood: the main sequence