H-R Diagrams

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H-R Diagrams
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Four Star Types
main sequence
supergiant
giant
white dwarf
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How are most stars classified?

• 90 of stars are main sequence stars

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Which star is brighter?

• a star with magnitude -10 is brighter.
• negatively numbered magnitudes are brighter than
  positive ones

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How are temperature and absolute magnitude
related for most stars?

• as one increases, the other increases

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What colors are associated with each spectral
class?

• O blue
• B bluish-white
• A white
• F yellowish-white
• G yellow
• K orange
• M red

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Which spectral class is our sun?What color is it?

• our sun is a yellow, G class star

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Which is hotterour sun or a supergiant? Which is
brighter?

• the sun is hotter than a supergiant
• supergiants are brighter