O3V There are no O3V anchor (Garrison94) or dagger (MK73) standards. HDE 303308 *used to be* the O3V primary standard, but it appears now that HD 64568 is. Walborn90 standard: HDE 303308 O3V((f)) Walborn02 standards: HD 64568 O3V((f*)), LH 10-3058 O3V((f*)) Skiff08 does not flag any stars as O3V standards. B-V(O3V) = -0.28 ; Martins06 => adopt B-V(O3V) = -0.308 [using EEM U-B/B-V fit, and U-B=-1.16] U-B(O3V) = -1.16 ; Martins06 U-B(O3V) = -1.22 ; Bessell98 U-B(O3V) = -1.22 ; Schmidt-Kaler82 => adopt (U-B)(O3V) = -1.16 Teff(O3V) = 52500 K ; Schmidt-Kaler82 Teff(O3V) = 50000 K ; Bessell98 Teff(O3V) = 50000 K ; Crowther97/Fig.3 Teff(O3V) = 46500 K ; Massey05(Milky Way) Teff(O3V) = 46500 K ; non-stan. HD 93128 (Repolust04) Teff(O3V) = 46000 K ; non-stan. HD 93250 (Repolust04) Teff(O3V) = 44852 K ; Martins05(Obs. scale), adopted by GrayCorbally09 Teff(O3V) = 44616 K ; Martins05(Theoretical scale) Teff(O3V) = 44520 K ; Holgado18(extrapolation past O4V) => adopt Teff(O3V) = 44700 K (logTeff = 4.650) [updated 9/29/2019] Mv(O3V) = -6.14 mag ; non-stan. HD 93250 (Repolust04) Mv(O3V) = -6.0 mag ; Schmidt-Kaler82 Mv(O3V) = -5.79 mag ; Martins05 Mv(O3V) = -5.7+-0.2 mag ; Walborn02 (n=7 O2-O3V((f*)) stars Mv(O3V) = -5.673 mag ; Teff-logL trend (Teff=44700K,logL=5.777,BCv=-4.03) Mv(O3V) = -5.65 mag ; Russeil03 Mv(O3V) = -5.6 mag ; GrayCorbally09 Mv(O3V) = -5.24 mag ; non-stan. HD 93128 (Repolust04) => adopt Mv(O3V) = -5.67 mag [updated 11/10/2019] BCv(O3V) = -4.62 mag ; Schmidt-Kaler82(BCv=-4.75 + 0.13 offset) BCv(O3V) = -4.276 mag ; Flower96(Teff=44700K,set so BCv(5772K)=-0.085) BCv(O3V) = -4.05 mag ; Martins05(Obs. scale) BCv(O3V) = -4.03 mag ; Martins05(Theoretical scale) BCv(O3V) = -3.999 mag ; LanzHubeny03(Teff=44700K,Z/Zsun=1) BCv(O3V) = -3.657 mag ; Balona94(Teff=44700K,set so BCv(5772K)=-0.085] => adopt BCv(O3V) = -4.03 [updated 11/10/2019] logL(O3V) = 5.66 dex ; non-stan. HD 93128 (Repolust04) logL(O3V) = 5.776 dex ; Mv=-5.67, BCv=-4.03, Mbol=-9.700 logL(O3V) = 6.01 dex ; non-stan. HD 93250 (Repolust04) => adopt logL(O3V) = 5.776 dex [updated 11/10/2019] => adopt Mbol(O3V) = -9.700 mag [updated 11/10/2019] logg(O3V) = 4.00 dex ; non-stan. HD 93128 (Repolust04) logg(O3V) = 3.95 dex ; non-stan. HD 93250 (Repolust04) => adopt logg(O3V) ~ 4.0 Rad(O3V) = 12.8836 ; Teff=44700, logL=5.776 => adopt Rad(O3V) = 12.884 Rsun [updated 11/10/2019] # No Standards MK78 and Keenan85 does not list an O3V standard (or earlier; only O4V and later). # Primary Standards HD 64568 O3V(f*): Walborn82 O3V((f*)): Walborn02 O4((f)): Garrison77 O5:: MacConnell76 O5: Crampton71,Loden65 O5/6: Houk88 Star was consistently called O3V (variant) by Walborn82 and Walborn02. # Secondary Standard LH 10-3058 O3V((f*)): Walborn02 # Weak Standard HDE 303308 = Cl* Trumpler 16 MJ 480 O3V: Walborn71, Garmany82(Humphreys78), O3V((f)): Walborn73,Walborn90,Massey93 O3: Conti77 O5: Vijapurkar93 O3V((f+)): Walborn04 Walborn02 redefined this star from an O3V to a primary O4V standard! # Others Walborn02 also lists Sk-71_51, P1163, P1311, & ST_5-52 as examples of O3V((f*)) Walborn71 defined O3 from 4 Carina Nebula stars. Walborn82 discusses the O3 class in detail. Walborn02 further bifurcates O3 into O2 and O3.5 also.