F0III zet Leo is the Garrison94 anchor standard for F0IIIa (the earliest temperature type with a III anchor), and so probably the best standard available. zet Leo is the best southernly accessible standard F0III MK43 standard: zet Leo - F0III gam Her - F0III JM53 standard: zet Leo - F0III Morgan65 standard: zet Leo - F0III Abt68 standard: zet Leo - F0III Cowley69 standard: zet Leo - F0III Morgan71 standard: zet Leo - F0III MorganAbt72 standard: zet Leo (=HR 4031) - F0III 130 Tau (=HR 1990) - F0III MK73 dagger standard: zet Leo (=HR 4031) - F0III MK78 standard: zet Leo - F0III Houk standard: zet Leo - F0III GrayGarrison89 standards: eta CMi - F0IIIb(low vsini) HD 73575 - F0IIIbn(high vsini) zet Leo - F0IIIa(low vsini) Garrison94 anchor: zet Leo - F0IIIa GrayAtlas standard: zet Leo - F0IIIa GrayNstars standard: zet Leo - F0III GrayCorbally10 standards: eta CMi - F0IIIb(low vsini) zet Leo - F0IIIa(low vsini) B-V(F0III) = 0.316 (+-0.007 sem, +-0.024 rms) ; N=13 HIP F0III *s w/i 75pc => adopt (B-V)(F0III) = 0.316 [updated 10/30/2020] (J-H)(F0III) = 0.078 (+-0.016 sem, +-0.039 stdev) ; N=9 F0III from Skiff compendium w/i 15deg of NGP, 2MASS photometry AAA flags (J-H)(F0III) = 0.094 ; smoothed relation from giants in Skiff compnedium w/i 15 deg of NGP, 2MASS photometry AAA flags => adopt (J-H)(F0III) = 0.094 [updated 10/30/2020] (H-Ks)(F0III) = 0.059 (+-0.008 sem, +-0.022 stdev) ; N=9 F0III from Skiff compendium w/i 15deg of NGP, 2MASS photometry AAA flags (H-Ks)(F0III) = 0.051 ; smoothed relation from giants in Skiff compnedium w/i 15 deg of NGP, 2MASS photometry AAA flags => adopt (H-Ks)(F0III) = 0.051 [updated 10/30/2020] (B-V)(F0III) = 0.327 ; HIP 19587 F0III 2006AJ....132..161G => adopt (B-V)(F0III) = 0.33 [updated 10/30/2020] Mv(F0III) = 1.18 ; HIP 19587 F0III 2006AJ....132..161G [EEM 10/30/2020: note Mv(F0V) = 2.57] # No standard GrayGarrison89 lists F0IIIb, F0IIIbn, F0IIIa standards, but no F0IIIan standard. GrayCorbally10 list F0IIIa and F0IIIb low vsini standards, but no F0III or variant high vsini standards. # Primary standard zet Leo = HD 89025 = HR 4031 (J1016+2325; V=3.4) *F0IIIa: GrayGarrison89,Gray01 F0III: Adams35,MK43,JM53,Abt68(stan),MorganAbt72(stan),MK73(dagger),MK78,Bouw81,Garrison94,GrayNstars F0II-III: Roman49 Adopt "F0IIIa" from GrayGarrison89. All studies have as "F0" giant or variant. # Secondary standards eta CMi F0IIIb:GrayGarrison89(low vsini) HD 73575 F0IIIbn:GrayGarrison89(high vsini) Adopt "F0IIIbn" from GrayGarrison89. GrayGarrison89 list type as "F0IIIb", but it is the high vsini standard, so I've added "n". Member of Praesepe cluster. 130 Tau = HR 1990 F0III: MorganAbt72(stan) # Variant gam Cap F0IIIpSr: MK43