Typical Characteristics of Spectral Types
TypeMV(B-V)0TeffBol. Corr.
Main Sequence
O5V-5.7-0.3342,000-4.40
O9V-4.5-0.3134,000-3.33
B0V-4.0-0.3030,000-3.16
B2V-2.45-0.2420,900-2.35
B5V-1.2-0.1715,200-1.46
B8V-0.25-0.1111,400-0.80
A0V+0.65-0.029,790-0.30
A2V+1.3+0.059,000-0.20
A5V+1.95+0.158,180-0.15
F0V+2.7+0.307,300-0.09
F2V+3.6+0.357,000-0.11
F5V+3.5+0.446,650-0.14
F8V+4.0+0.526,250-0.16
G0V+4.4+0.585,940-0.18
G2V+4.7+0.635,790-0.20
G5V+5.1+0.685,560-0.21
G8V+5.5+0.745,310-0.40
K0V+5.9+0.815,150-0.31
K2V+6.4+0.914,830-0.42
K5V+7.35+1.154,410-0.72
M0V+8.8+1.403,840-1.38
M2V+9.9+1.493,520-1.89
M5V+12.3+1.643,170-2.73
Giants*
G5III+0.9+0.865,050-0.34
G8III+0.8+0.944,800-0.42
K0III+0.7+1.004,660-0.50
K2III+0.5+1.164,390-0.61
K5III-0.2+1.504,050-1.02
M0III-0.4+1.563,690-1.25
M2III-0.6+1.603,540-1.62
M5III-0.3+1.633,380-2.48
Supergiants
O9I-6.5-0.2732,000-3.18
B2I-6.4-0.1717,600-1.58
B5I-6.2-0.1013,600-0.95
B8I-6.2-0.0311,100-0.66
A0I-6.3-0.019,980-0.41
A2I-6.5+0.039,380-0.28
A5I-6.6+0.098,610-0.13
F0I-6.6+0.177,460-0.01
F2I-6.6+0.237,030-0.00
F5I-6.6+0.326,370-0.03
F8I-6.5+0.565,750-0.09
G0I-6.4+0.765,370-0.15
G2I-6.3+0.875,190-0.21
G5I-6.2+1.024,930-0.33
G8I-6.1+1.144,700-0.42
K0I-6.0+1.254,550-0.50
K2I-5.9+1.364,310-0.61
K5I-5.8+1.603,990-1.01
M0I-5.6+1.673,620-1.29
M2I-5.6+1.713,370-1.62
M5I-5.6+1.802,880-3.47
*For stars hotter than G5III, use the Bolometric Corrections for the corresponding spectral type Main Sequence star.