O4.5V

There are no known O4.5V standards. 

MK73,MK78,Walborn90,Garrison94 do not list a O4.5V standard

(B-V)(O4.5V) = -0.325 ; U-B=-1.155 trend Q-method
=> adopt (B-V)(O4.5V) = -0.325 [updated 2/7/2020]

(U-B)(O4.5V) = -1.155 ; interp
=> adopt (U-B)(O4.5V) = -1.155 [updated 2/7/2020]

Teff(O4.5V) = 41485 K ; Simon-Diaz14 linear fit for O4.5V
Teff(O4.5V) = 41861 K ; Martins05
Teff(O4.5V) = 42090 K ; Holgado18
Teff(O4.5V) = 42400 K ; EEM trend for O dwarfs 1/20/2020 **
Teff(O4.5V) = 42658 K ; Simon-Diaz17 median for O4V (N=1; HD15629)
=> adopt Teff(O4.5V) = 42200 K (logTeff=4.625) [updated 1/20/2020]

logg(O4.5V) = 3.78 dex ; Holgado18
=> adopt logg(O4.5V) = 3.78 dex [updated 1/31/2020]

BCv(O4.5V) =   -3.559 mag ; Balona94 for Teff=42200K for BCv(Sun)=-0.085
BCv(O4.5V) =  -3.78  mag ; Martins05(obs.scale)
BCv(O4.5V) =  -3.818 mag ; LanzHubeny03/07 for Teff=42200K for BCv(Sun)=-0.085
BCv(O4.5V) =  -3.825 mag ; Martins06/theor.scale
BCv(O4.5V) = -3.825 mag ; EEM interp O4V(-3.89),O5V(-3.76)
BCv(O4.5V) =  -3.848 mag ; Martins05
BCv(O4.5V) =   -4.090 mag ; Flower96 for Teff=42200K for BCv(Sun)=-0.085
=> adopt BCv(O4.5V) = -3.82 [updated 1/31/2020]

logL(O4.5V) = 5.604 dex ; Mv=5.45, BCv=-3.82 => Mbol=-9.270
logL(O4.5V) = 5.602 dex ; EEM trend for O dwarfs
logL(O4.5V) = 5.578 dex ; Martins05
=> adopt logL(O4.5V) =  5.604 dex [updated 2/8/2020]
=> adopt Mbol(O4.5V) = -9.270 mag [updated 2/8/2020]

Mv(O4.5V) = -5.457 mag ; EEM trend for O4.5V
Mv(O4.5V) = -5.420 mag ; Martins06/obs.scale(interp)
Mv(O4.5V) = -5.415 mag ; Martins06/theor.scale(interp)
Mv(O4.5V) = -5.357 mag ; Martins05 
=> adopt Mv(O4.5V) = -5.45 mag [updated 2/8/2020]

Rad(O4.5V) = 11.700 Rsun ; Martins05 (Teff=41861K,logL=5.578)
Rad(O4.5V) = 11.8584 Rsun ; logL=5.604, Teff=42200K
=> adopt Rad(O4.5V) = 11.858 Rsun [updated 2/8/2020]

Mass(O4.5V) = 46.0 Msun   ; MIST/Choi16 solar tracks for logT=4.625,logL=5.604
Mass(O4.5V) =  49+-6 Msun ; Weidner10
=> adopt Mass(O4.5V) = 46 Msun [updated 4/16/2022]