Pismis 20

MK spectral classification

No	Ref	MK
0003	334	B0 I-III
0007	334	B0 I-III
0007	334	O8.5 I
0008	334	B2.5 Ia
0009	334	B0.2 III
0011	334	B0 I
0025	334	WN6