Awesome Example: Stellar Classification

• dwarf spectral sequence here and here
• O star, DA white dwarf
• interpretation--ionization diversity and the dominance of hydrogren: Cecilia Payne-Gaposhkin PhD Thesis 1925
• spectrum of the Sun
• compare mystery stars here, here, here, and here (spoiler)
• HR diagrams here, here, and here
• line shapes: how to tell a dwarf from a giant from the spectrum

Absorption Lines and Curve of Growth

• more observed absorption line spectra
  • interstellar medium lines of potassium and lithium towards zeta Ophiuchi (Kawanomoto+ 2009), and in the SMC (Howk+ 2012)
• online catalog of transitions
• contributions to linewidths
• profile functions
• curve of growth
• hydrogen lines and the Lyman limit