O

O4If　HD15570　HD190429A
O4V((f))　9 Sgr
O4.5If　HD14947
O4.5III(f)　HD15558
O4.5V((f))　HD15629
O6.5I(n)fp　λ Cep
O6.5V((f))z　HD199579
O7Iafpvar　UW CMa
O7Vzvar?　HD54662
O7.5Iabf　QZ Sge
O7.5IIIn((f))　ξ Per　V1809 Cyg
O8Iape　HD152408
O8fpe　HD191612
O8Vn　HD46056
O8II((f))　HD162978
O8.5II　HD207198
O9Ia　α Cam
O9II　LY Aur
O9IIIvar　ι Ori
O9V　NU Ori
O9.2IV　HD57682
O9.2IVnn　ζ Oph
O9.5I　V473 Per
O9.5Ia/ab　V453 Sco
O9.5III　X Per
O9.5IIInn　HD93521
O9.5IVp　θ2 Ori A
O9.5V　σ Ori　AE Aur
O9.5Vep　GSC3973:812
O9.7Iabpvar　V1357 Cyg
O9.7Ib　V689 Mon
O9.7II　HD10125
O9.7IIn　V986 Oph
O9.7V　υ Ori