A0III

alf Sex is the best southernly available A0III standard. 

MK43 standard:            del Cyg - A0III
JM53 standard:		  alf Dra - A0III
Garrison67 standard:      alf Dra - A0III
Abt68 standard:		  alf Dra - A0III
Cowley69 standard:	  alf Dra - A0III
Houk standards:		  HR 4218 (=HD 93526) - A0III [sec. stand. from Cowley69]
			  HR 3981 (=HD 87887) - A0III [sec. stand. from Cowley69]
MK78 standards:		  alf Dra (=HD 123299) - A0III
			  20 Cap (=HD 199728) - A0III (Si II)
GrayGarrison87 standards: alf Sex (=HD 87887) - A0III [low vsini]
			  alf Dra (=HD 123299) - A0III [low vsini]
			  HR 2969 (=HD 61931) - A0IIIn [high vsini]
WiegertGarrison98 stan:   HD 142805 - A0III 
GrayAtlas standard:       alf Dra - A0III
			  phi Dra - A0III Si
GrayNstars standard:      alf Dra - A0III

(J-H)  = 0.017 (+-0.033 sem, +-0.094 stdev) ; N=11 A0III from Skiff compendium w/i 15deg of NGP, 2MASS photometry AAA flags
(J-H)  = 0.024 ; smoothed relation from giants in Skiff compnedium w/i 15 deg of NGP, 2MASS photometry AAA flags
=> adopt (J-H)(A0III) = 0.024

(H-Ks) = 0.018 (+-0.014 sem, +-0.044 stdev) ; N=11 A0III from Skiff compendium w/i 15deg of NGP, 2MASS photometry AAA flags
(H-Ks) = 0.015 ; smoothed relation from giants in Skiff compnedium w/i 15 deg of NGP, 2MASS photometry AAA flags
=> adopt (H-Ks)(A0III) = 0.015

(B-V)(A0III) = -0.031 ; HIP 90185 A0III 2009A&A...501..297Z
(B-V)(A0III) = -0.005 ; HIP 72220 A0IIInn 1995ApJS...99..135A
=> adopt (B-V)(A0III) = -0.02 [updated 10/30/2020]

Mv(A0III) = -1.42 ; HIP 90185 A0III 2009A&A...501..297Z
Mv(A0III) =  0.65 ; HIP 72220 A0IIInn 1995ApJS...99..135A
[EEM 10/30/2020: note Mv(A0V) = 0.99]

# No standard

Morgan65 doesG not list a A0III standard. Houk does not list a primary
A0III standard, but two secondary standards.

# Primary standards

alf Dra = HD 123299 = Thuban (J1404+6422; V=3.7)
   *A0III: JM53,Garrison67(stan),Palmer68,Abt68(stan),MK78,GrayGarrison87(low vsini stan.),GrayNstars
    A0IV: Zorec09
    A7V: Bouw81

alf Sex = HD 87887 (J1002+0007; V=4.5)
   *A0III: Slettebak54,deVaucouleurs57,Cowley69,GrayGarrison87(low vsini stan.),Houk99(Garrison type)
    A0: Cannon
    B9.5III: Abt95
    A2III: Bouw81

    Houk lists vsini = 5 km/s. SMARTS 1.5-m spectra in hand (26Ia
    blue, 47Ib red).


HR 2969 = HD 61931
    A0IIIn: GrayGarrison87(high vsini stan.)

# Variant

HR 8033 = HD 199728 (J2059-1902; V=6.3)
   A0III Si: MK78
   F0:VpSi: Abt95 (metals,Ca,Mg very weak)
   ApSi: Bidelman73
   B9pSi: Cowley69
   A0p: Cannon
   ApSi: Houk88