Update! Closest star system found in the past century

• press release
• Luhman (2013) article

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
• implications for galaxies: spiral vs elliptical

Stellar Stability

• gasses and pressure
  java applets: kinetic theory, gas law, piston, ideal atmosphere
• hydrostatic equilibrium
• stability
  solar response to flare

Stars in a Nutshell

• stellar structure
• star birth: Eagle nebula
  starburst galaxy
• stellar spectra: a digitial classification atlas
• the main sequence: nuclear reaction chains
  Super-K and its image of the Sun, in neutrinos
• H-R diagram animation--watch 'em evolve!
  another animation
• post-main sequence evolution
  • low mass:
    M dwarfs, L dwarfs and T dwarfs; an L dwarf discovery in IR
  • intermediate mass:
    red giants
    planetary nebulae: Cat's eye nebula, spirograph nebula
    white dwarfs: cool!
    implications: near-IR Milky Way K giants
    elliptical galaxy NGC 2768
  • high mass:
    supergiants: Betelgeuse
    supernovae: 1987A, 1999em, 2005cs
    ejecta: N63A
    neutron stars and pulsars: Crab nebula
    black holes: Cyg X-1
• nucleosynthesis:
  the periodic table and
  the circle, the circle of life