Spectral type characteristics
Main sequence stars (V)
(Note: table color approximates the color of the star's surface)
| Spectral Type |
Temperature (K) |
Average Absolute Magnitude (MV) |
Average Luminosity (in solar luminosities) |
| O5 |
54,000 |
-4.5 |
200,000 |
| O6 |
45,000 |
-4.0 |
140,000 |
| O7 |
43,300 |
-3.9 |
120,000 |
| O8 |
40,600 |
-3.8 |
80,000 |
| O9 |
37,800 |
-3.6 |
55,000 |
| B0 |
29,200 |
-3.3 |
24,000 |
| B1 |
23,000 |
-2.3 |
5550 |
| B2 |
21,000 |
-1.9 |
3190 |
| B3 |
17,600 |
-1.1 |
1060 |
| B5 |
15,200 |
-0.4 |
380 |
| B6 |
14,300 |
0 |
240 |
| B7 |
13,500 |
0.3 |
140 |
| B8 |
12,300 |
0.7 |
73 |
| B9 |
11,400 |
1.1 |
42 |
| A0 |
9600 |
1.5 |
24 |
| A1 |
9330 |
1.7 |
20 |
| A2 |
9040 |
1.8 |
17 |
| A3 |
8750 |
2.0 |
14 |
| A4 |
8480 |
2.1 |
12 |
| A5 |
8310 |
2.2 |
11 |
| A7 |
7920 |
2.4 |
8.8 |
| F0 |
7350 |
3.0 |
5.1 |
| F2 |
7050 |
3.3 |
3.8 |
| F3 |
6850 |
3.5 |
3.2 |
| F5 |
6700 |
3.7 |
2.7 |
| F6 |
6550 |
4.0 |
2.0 |
| F7 |
6400 |
4.3 |
1.5 |
| F8 |
6300 |
4.4 |
1.4 |
| G0 |
6050 |
4.7 |
1.2 |
| G1 |
5930 |
4.9 |
1.1 |
| G2 |
5800 |
5.0 |
1 |
| G5 |
5660 |
5.2 |
0.73 |
| G8 |
5440 |
2.6 |
0.51 |
| K0 |
5240 |
6.0 |
0.38 |
| K1 |
5110 |
6.2 |
0.32 |
| K2 |
4960 |
6.4 |
0.29 |
| K3 |
4800 |
6.7 |
0.24 |
| K4 |
4600 |
7.1 |
0.18 |
| K5 |
4400 |
7.4 |
0.15 |
| K7 |
4000 |
8.1 |
0.11 |
| M0 |
3750 |
8.7 |
0.080 |
| M1 |
3700 |
9.4 |
0.055 |
| M2 |
3600 |
10.1 |
0.035 |
| M3 |
3500 |
10.7 |
0.027 |
| M4 |
3400 |
11.2 |
0.022 |
| M5 |
3200 |
12.3 |
0.011 |
| M6 |
3100 |
13.4 |
0.0051 |
| M7 |
2900 |
13.9 |
0.0032 |
| M8 |
2700 |
14.4 |
0.0020 |
L0
|
2600
|
*
|
0.00029
|
L3
|
2200
|
*
|
0.00013
|
L8
|
1500
|
*
|
0.000032
|
T2
|
1400
|
*
|
0.000025
|
T6
|
1000
|
*
|
0.0000056
|
T8
|
800
|
*
|
0.0000036
|
*- not visible to the human eye (for the most part)
Giants (III)
| Spectral Type |
Temperature (K) |
Absolute Magnitude |
Luminosity (in solar luminosities) |
| G5 |
5010 |
0.7 |
127 |
| G8 |
4870 |
0.6 |
113 |
| K0 |
4720 |
0.5 |
96 |
| K1 |
4580 |
0.4 |
82 |
| K2 |
4460 |
0.2 |
70 |
| K3 |
4210 |
0.1 |
58 |
| K4 |
4010 |
0.0 |
45 |
| K5 |
3780 |
-0.2 |
32 |
| M0 |
3660 |
-0.4 |
15 |
| M1 |
3600 |
-0.5 |
13 |
| M2 |
3500 |
-0.6 |
11 |
| M3 |
3300 |
-0.7 |
9.5 |
| M4 |
3100 |
-0.75 |
7.4 |
| M5 |
2950 |
-0.8 |
5.1 |
| M6 |
2800 |
-0.9 |
3.3 |
Supergiants (I)
| Spectral Type |
Temperature (K) |
Absolute Magnitude |
Luminosity (in solar luminosities) |
| B0 |
21,000 |
-6.4 |
320,000 |
| B1 |
16,000 |
-6.4 |
280,000 |
| B2 |
14,000 |
-6.4 |
220,000 |
| B3 |
12,800 |
-6.3 |
180,000 |
| B5 |
11,500 |
-6.3 |
140,000 |
| B6 |
11,000 |
-6.3 |
98,000 |
| B7 |
10,500 |
-6.3 |
82,000 |
| B8 |
10,000 |
-6.2 |
73,000 |
| B9 |
9700 |
-6.2 |
61,000 |
| A0 |
9400 |
-6.2 |
50,600 |
| A1 |
9100 |
-6.2 |
44,000 |
| A2 |
8900 |
-6.2 |
40,000 |
| A5 |
8300 |
-6.1 |
36,000 |
| F0 |
7500 |
-6 |
20,000 |
| F2 |
7200 |
-6 |
18,000 |
| F5 |
6800 |
-5.9 |
16,000 |
| F8 |
6150 |
-5.9 |
12,000 |
| G0 |
5800 |
-5.9 |
9600 |
| G2 |
5500 |
-5.8 |
9500 |
| G5 |
5100 |
-5.8 |
9800 |
| G8 |
5050 |
-5.7 |
11,000 |
| K0 |
4900 |
-5.7 |
12,000 |
| K1 |
4700 |
-5.6 |
13,500 |
| K2 |
4500 |
-5.6 |
15,200 |
| K3 |
4300 |
-5.6 |
17,000 |
| K4 |
4100 |
-5.5 |
18,300 |
| K5 |
3750 |
-5.5 |
20,000 |
| M0 |
3660 |
-5.3 |
50,600 |
| M1 |
3600 |
-5.3 |
52,000 |
| M2 |
3500 |
-5.3 |
53,000 |
| M3 |
3300 |
-5.3 |
54,000 |
| M4 |
3100 |
-5.2 |
56,000 |
| M5 |
2950 |
-5.2 |
58,000 |
Source: http://www.uni.edu/morgans/astro/course/Notes/section2/spectraltemps.html