3.9.2.4 Stellar spectral classes Flashcards by Tom FORSTER

Q

Mnemonic

A

Oh be a fine girl, kiss me!

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Q

O

A

blue
25,000 - 50,000
He+, He, H

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Q

B

A

blue
11,000 - 25,000
He, H

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Q

A

A

blue-white
7,500 - 11,000
H (strongest), ionised metals

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Q

F

A

white
6,000 - 7500
ionised metals

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Q

G

A

yellow-white
5,000 - 6,000
ionised & neutral metals

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Q

K

A

orange
3,500 - 5,000
neutral metals

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Q

M

A

red
<3,500
neutral atoms, TiO

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Q

Which spectral class has the most prominent hydrogen absorption lines?

A

A

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