The Celestial Sphere

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stellar spectra
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stellar spectra
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• The Hertzsprung-Russel diagram
• a.k.a. HR diagram
• Vertical axis L
• Horiz. axis Ts

color of the star
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• The Hertzsprung-Russel diagram
• a.k.a. HR diagram
• Vertical axis L
• Horiz. axis Ts

color of the star
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• The Hertzsprung-Russel diagram
• a.k.a. HR diagram
• Vertical axis L
• Horiz. axis Ts

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• Red giants top right
• L very big
• He burns hot and fast
• Ts is low
• surface far from core

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planetary nebula with white dwarf
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Hubble image of Crab nebula
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Chandra X-ray image of Crab nebula