3.9.2.4 Stellar spectral classes Flashcards

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1
Q

Mnemonic

A

Oh be a fine girl, kiss me!

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2
Q

O

A
  • blue
  • 25,000 - 50,000
  • He+, He, H
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3
Q

B

A
  • blue
  • 11,000 - 25,000
  • He, H
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4
Q

A

A
  • blue-white
  • 7,500 - 11,000
  • H (strongest), ionised metals
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5
Q

F

A
  • white
  • 6,000 - 7500
  • ionised metals
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6
Q

G

A
  • yellow-white
  • 5,000 - 6,000
  • ionised & neutral metals
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7
Q

K

A
  • orange
  • 3,500 - 5,000
  • neutral metals
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8
Q

M

A
  • red
  • <3,500
  • neutral atoms, TiO
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9
Q

Which spectral class has the most prominent hydrogen absorption lines?

A

A

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