F5IV.txt

MorganAbt72 lists 48 Gem (HR 2706) as the F5IV standard

The MK78 atlas includes the F5III-IV standard HD 2706 and the
F5IV-V standard alf CMi (Procyon), but no "pure" class IV standard. 

JM53, MK73, Cowley74, and Houk88 do not list F5IV standards. 

JM53 lists a non-standard alf CMi (Procyon) as F5IV-V. 

GrayNstars lists HR2706 as their F5IV-III CTIO, DSO, and Steward
Obs. standard, and Procyon as their F5V-IV CTIO and DSO standard.


# Standards
48 Gem (J0712+2408)
  F5IV: Morgan72(stan)
  F4III: Wilson50
  F5III: Harlan69
  F4II-III: Bouw81
  F5: Cannon
  F5III-IV: Gray01

# Variant 
HD 61421 = HR 2943 = Procyon = Alf CMi (J0739+0514)
  F5IV: MK43 
  F5IV-V: JM53,MK78,Gray01,Gray03
  F5V: Cowley76
  F4V: Paunzen01
  F5: Cannon
  Nice thing about Procyon as a F5IV-V standard is most agree on F5 subtype.