F4III

36 Per could be considered a secondary standard (from JM53), but there
are no well-used modern standards for F4III.

JM53 standard:		36 Per - F4III
Abt68 standard:		36 Per - F4III
MorganAbt72 standard:   55 Eri (ft) (=HR 1505) - F4IIIp
Cowley74 standard:	36 Per - F4III

(J-H)(F4III)  = 0.172 ; smoothed relation from giants in Skiff compendium w/i 15 deg of NGP, 2MASS photometry AAA flags
=> adopt (J-H)(F4III)  = 0.172 [updated 10/30/2020]

(H-Ks)(F4III) = 0.069 ; smoothed relation from giants in Skiff compendium w/i 15 deg of NGP, 2MASS photometry AAA flags
=> adopt (H-Ks)(F4III) = 0.069 [updated 10/30/2020]


# No standards

MK43, Houk, MK78, GrayNstars, and GrayCorbally10 do not list a F4III standard

# Secondary standards

36 Per = HD 21770 (J0332+4603; V=5.3) 
  *F4III: Roman52,JM53(stan),Jaschek64(all),Abt68(stan),Cowley74(stan)
   F6III: Bouw81
   A9Vs: Adams35
   F0: Cannon

   Adopt "F4III" from JM53.

# Variant (and weak standard)

55 Eri (ft.) = HR 1505B = HD 30020
   F4III p Sr: MorganAbt72(stan, peculiar: Ca II H,K, greatly weakened, Sr II 4077 strong) 
   F2Vp Sr Si: Abt08
   F5III gF3 p Sr: Corbally84
   F5III: Slettebak72
   F2IIIm: Bidelman58
   F3IV-V: Adams35
   Fm:: Cowley76

   The "standard" is the slightly fainter and northwestern of a 9"
   pair of stars of similar magnitude (V ~ 6.8). The companion is a
   late G-giant.  Other than MorgantAbt72's use of this star as a
   standard (with notably peculiar spectrum), no one else has used
   this star as a standard.