B1III The best southernly accessible B1III standard is sig Sco MK43 standard: sig Sco - B1III bet CMa (=HR 2294) - B1II-III alf Vir - B1III-IV Underhill49 standard: 15 CMa - B1III Morgan50 standard: omi Per (=HR 1131) - B1III JM53 standards: omi Per (=HR 1131) - B1III sig Sco - B1III Garrison67 standard: omi Per (=HR 1131) - B1III Abt68 standard: sig Sco - B1III Lesh68 standards: omi Per (=HR 1131) - B1III sig Sco - B1III Hiltner69 standard: omi Per (=HR 1131) - B1III Walborn71 standard: sig Sco - B1III Houk standard: sig Sco - B1III [from JM53] MK73 dagger standard: omi Per (=HR 1131) - B1III Garrison77 standard: omi Per (=HR 1131) - B1III MK78 standard: bet CMa (=HD 44743) - B1II-III Walborn90 standard: sig Sco - B1III bet Cen - B1II-III GrayAtlas standard: bet CMa - B1II-III # Primary standard sig Sco A = HR 6084 = HD 147165 *B1III: MK43,JM53,Bertiau58,Morris61,Garrison67,Abt68(stan),Meisel68,Slettebak68,Hiltner69,Houk(stan),Walborn90 O9.5(V)+B7(V): Beavers80 B2IV: Lutz77 20" binary. WiegertGarrison98 stan listed it as "B1" and intermediate between "III" and "Ib", so perhaps B1II? # Secondary standard omi Per = HR 1131 *B1III: JM53,Garrison67(stan),Hiltner69(stan),MK73(dagger),Garrison77(stan) # Weak standard 15 CMa = HR 2571 = HD 50707 (J0653-2013) *B1III: Underhill49(stan. from Morgan, priv.comm.),Hiltner69 B1/2III: Lynds56,Walker56 B1IV: Morgan55 # Variant bet CMa = HR 2294 = HD 44743 (J0622-1757; V=2.0) *B1II-III: MK43,Lesh68,MK78 B1III: Williams36,Miczaika51,Zorec09 B1: Cannon B1s: Neubauer43 B1.5IV: Levenhagan06 B0.7II-III: Underhill47 B2III: Chalonge52