NGC 6231

MK spectral classification

NoRefMK
0113430B0 V
0157430B1 V
0226430B0 Vn
0234430B0.5 IV
0268430B0 Vn
0303430B2 IV
0346430B1 V
0353430B0 V
0364430B0 V
0374430B0.5 V
0403430B1 V
0434430B0 V
0461430B1 V
0486430B0 Vn
0497430B0.5III
0571430O8 III
0615430O9 III
0651430B0 V
0712430O9 V
0857430O9.5 Ib