3.9.2.4 Stellar spectral classes Flashcards
1
Q
Mnemonic
A
Oh be a fine girl, kiss me!
2
Q
O
A
- blue
- 25,000 - 50,000
- He+, He, H
3
Q
B
A
- blue
- 11,000 - 25,000
- He, H
4
Q
A
A
- blue-white
- 7,500 - 11,000
- H (strongest), ionised metals
5
Q
F
A
- white
- 6,000 - 7500
- ionised metals
6
Q
G
A
- yellow-white
- 5,000 - 6,000
- ionised & neutral metals
7
Q
K
A
- orange
- 3,500 - 5,000
- neutral metals
8
Q
M
A
- red
- <3,500
- neutral atoms, TiO
9
Q
Which spectral class has the most prominent hydrogen absorption lines?
A
A
