Today Phil’s 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.
Check out the Crash Course Astronomy solar system poster here: [ Ссылка ]
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Chapters:
Introduction: Stars 00:00
Stellar Spectra 1:07
Star Classifications 3:03
Why Are There No Green Stars? 4:00
Luminosity Depends on Size and Temperature 5:27
The HR Diagram 6:33
Main Sequence Stars 7:27
Other Stars on the HR Diagram 8:17
Review 9:50
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PHOTOS/VIDEOS
Stars [ Ссылка ] [credit: ESA/Hubble & NASA]
Spitzer Spectrum [ Ссылка ] [credit: NASA/JPL-Caltech/Leiden/SRON]
Sun spectrum [ Ссылка ] [credit: N.A.Sharp, NOAO/NSO/Kitt Peak FTS/AURA/NSF]
Annie Jump Cannon [ Ссылка ] [credit: New York World-Telegram and the Sun Newspaper]
Cecilia Payne-Gaposchkin [ Ссылка ]_(1900-1979)_(3).jpg [credit: Smithsonian Institution]
OBAFGKM [ Ссылка ] [credit: NOAO/AURA/NSF]
Betelgeuse [ Ссылка ] [credit: ESO/Digitized Sky Survey 2. Acknowledgment: Davide De Martin]
Sirius [ Ссылка ] [credit: NASA, ESA, H. Bond (STScI) and M. Barstow (University of Leicester)]
Solar AM0 spectrum with visible spectrum background [ Ссылка ].png [credit: Danmichaelo, Wikimedia Commons]
Blue sky [ Ссылка ] [credit: Skitter Photo]
Hawaii sunset photo [credit: Phil Plait]
Hertzsprung-Russell Diagram [ Ссылка ].jpg [credit: ESO]
