Table :
Table 11-1: Approximate Main-Sequence Lifetimes
Mass (M
⊙
)
Surface Temperature (K)
Spectral class
Luminosity (L
⊙
)
Main-sequence lifetime (10
6
years)
25
35,000
O
80,000
4
15
30,000
B
10,000
15
3
11,000
A
60
800
1.5
7000
F
5
4500
1.0
6000
G
1
12,000
0.75
5000
K
0.5
25,000
0.50
4000
M
0.03
700,000