Explaining the stars and how they can be categorized using their spectra. Together with their distance, this provides a wealth of information about them including their luminosity, size, and temperature. The HR diagram plots stars’ luminosity versus temperature, and most stars fall along the main sequence, where they live most of their lives.
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Table of Contents
Stars Can Be Categorized Using Their Spectra 1:32
Spectra With Distance Can Identify Luminosity, Size, and Temperature 5:20
The HR Diagram Plots Luminosity vs Temperature 6:33
Most Stars Fall Along the Main Sequence 7:16
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PHOTOS/VIDEOS
Stars
http://www.nasa.gov/images/content/70... [credit: ESA/Hubble & NASA]
Spitzer Spectrum
http://www.jpl.nasa.gov/spaceimages/d... [credit: NASA/JPL-Caltech/Leiden/SRON]
Sun spectrum
https://www.noao.edu/image_gallery/ht... [credit: N.A.Sharp, NOAO/NSO/Kitt Peak FTS/AURA/NSF]
Annie Jump Cannon
https://en.wikipedia.org/wiki/Annie_J... [credit: New York World-Telegram and the Sun Newspaper]
Cecilia Payne-Gaposchkin
https://en.wikipedia.org/wiki/Cecilia... [credit: Smithsonian Institution]
OBAFGKM
https://www.noao.edu/image_gallery/ht... [credit: NOAO/AURA/NSF]
Betelgeuse
http://www.eso.org/public/usa/images/... [credit: ESO/Digitized Sky Survey 2. Acknowledgment: Davide De Martin]
Sirius
https://www.nasa.gov/multimedia/image... [credit: NASA, ESA, H. Bond (STScI) and M. Barstow (University of Leicester)]
Solar AM0 spectrum with visible spectrum background
https://commons.wikimedia.org/wiki/Fi... [credit: Danmichaelo, Wikimedia Commons]
Blue sky
http://www.pexels.com/photo/sky-sunny... [credit: Skitter Photo]
Hawaii sunset photo [credit: Phil Plait]
Hertzsprung-Russell Diagram
https://commons.wikimedia.org/wiki/Fi... [credit: ESO]
