A2IV

JM53 and MK73 do not list A2IV standards.

GarrisonGray94 list bet Crt (HD 97277) as their low-vsin A2IV standard,
and HD 141003 (Bet Ser) as their high-vsini A2IV standard.

Houk88 adopts bet Ser A (HR 5867, HD 141003) from JM53 as their A2IV
standard.

GrayNstars lists Bet Crt as their A2IV CTIO and Steward Obs. standard. 
 
# Primary Standard
HD 141003 = HR 5867 = Bet Ser A (J1546+1525, V=3.7)
  A2IV: MK43,Osawa59,Jaschek64(all),GrayGarrison87,DeVaucoleurs57(A2:IV)
  A2: Cannon
  A2V: Levato78,Palmer68
  A3V: Jaschek78(Cowley69)
  A1V: Abt95
  V=10 K3V companion 30" away (Bet Ser B) 
  Using HIP2008 data, star is ~ 1.2 mag above MS (Mv=0.26)