F9V

There is no F9V dagger type

Houk does not treat F9 as a full type, and has only *one* F9V in her
catalogs (HD 102870 = Beta Vir; which was reclassified from F8V from
JM53 to MK73)

Keenan99 lists three F9V standards

Skiff08 flags three stars as F9V MK standards: HD 27691 (Morgan73), HD
102870 (MK73), HD 27383 (MK73).

MorganAbt73 lists three F9V MK standards: HD 27383, HR 4540 (Bet Vir), HD 27691,
and says that all have B-V=0.59. 

Morgan65 classified one F9V Hyad: HD 28635.

Garrison72 and Corbally86 used Bet Vir as their primary F9V standard.

Cowley76 lists bet Vir and chi Her as F9V standards. 

<B-V>(F9V) = 0.578 (HIP)

Among the 45 "F9Vs" in Gray06, a search of the Skiff07 MK database
could find *no* instances of a star where the majority of authors
decided on an F9V spectral type.

Gray01/03/06 list 57 nearby F9V stars. Median HIP colors:
<B-V>(F9V) = 0.552 (+-0.005 sem, +-0.036 stdev; N=57)
<V-I>(F9V) = 0.623 (+-0.005 sem, +-0.032 stdev; N=57)

# No standard
Morgan65 does not list an F9V standard.

# Standards
HD 10647 = HR 506 = HIP 7978 (J0142-5344)
  F9V: Keenan88,Keenan99,Gray89,GrayNstars,Gray03
  F8V: Houk75
  B-V(HIP)=0.551, Vmag=5.52, Mv=4.32, dMv=+0.18, par=57.6+-0.5 mas
  At least Keenan and Gray agree, but a bit blue for mean F9V

HD 27691 = Cl* Melotte 25 RG 10 
  F9V: MorganAbt73,Abt85(AB),Gray01(F9V+) 
  F8IV: Harlan69
  F8V: Adams35 
  F7: Schwassmann51
  G0V: Morgan65
  HD 27691 is a 1.5" separation pair (V=7.3+8.6)
  Close binary, may not be the best standard -- however Morgan/Abt/Gray agree on F9V. 

# Weak standard
HD 27383 = 55 Tau = HIP 20215 = Cl Melotte 25 29 (Hyad)
  F9V: MK73,MorganAbt73,Jaschek74,Jaschek78,Abt85,Garcia89,Gray89
  F8V: Corbally86(stan),Gray01
  This star was "the" F9V standard in Gray89, but he calls it "F8V" in 2001.
  It appears to be much bluer than other F9Vs in Houk
  B-V(HIP)=0.509, Vmag=6.85, Mv=3.68, dMv=-0.18, par=23.3+-2.3 mas

HD 4614A = eta Cas A = HR 219A = HIP 3821
  F9V: Keenan88,Keenan89,Hoffleit91,Keenan99,Gray01,GrayNstars,Abt08
  G0V: MK43,JM53,MorganAbt73,MK78,Abt81,Barry70(G0Vb),Moore50
  B-V(HIP)=0.587, Vmag=3.46, Mv=4.59, dMv=+0.20, par=168.0+-0.4 mas
  Spectroscopic binary; not in Houk
  Probably inappropriate as standard as G0V ~1940s-80s, but F9V to Keenan & Gray

HD 102870 = bet Vir = HR 4540 = HIP 57757
  F9V: Garrison72(stan),MK73,MorganAbt73,Cowley76(stan),HoukStandard,Garcia89,Kennedy83,Houk99
  F8V: Morgan53,MK43
  F8IV-V: Gray01
  It appears to be much bluer than other F9Vs in Houk
  Basically F9V from MK73 onward (until Gray01)
  B-V(HIP)=0.518, Vmag=3.59, Mv=3.40, dMv=-0.53, par=91.7+-0.9 mas

HD 176051 = HR 7162
  F9V: Keenan89,Gray01
  G0V: Adams35,Roman52(weak lines),Harlan74,Abt81,Cannon(G0)
  F9.5V: Keenan80
  Its a 1" binary, and the SpT floats in the literature. Not a great standard

HD 142373 = chi Her
  F9V: Roman55,Jaschek64(most),Cowley76(stan),Jaschek78(JM53)
  F8V Fe-2 Hdel-1: Keenan89
  G0V Fe-0.8 CH-0.5: Gray03
  hF9gG0mF6: Jaschek89
  fF9VgG0mF7: Abt86
  G0: Cannon
  F9V star in JM53, but later a composite type/metal poor. 

HD 84117 = HR 3862 = HIP 47592 = GJ 364
  F9V: Keenan89,Keenan99
  F9IV: Jaschek78(Maloroda75),Kennedy83
  F8V: Gray06 
  G0V: Evans57,Jaschek64,Houk88,Cannon(G0)
  F7V: Adams35
  B-V(HIP)=0.534, Vmag=4.93, Mv=4.07, dMv=+0.03, par=67.2+-0.7 mas
  hmmm, there appears to be some disagreement

# Variant 
HD 22484 = HR 1101 = HIP 16852 = 10 Tau (J0336+0024, V=4.3)
  F9IV-V: Keenan89,Gray01
  F9V: Jaschek78(Malaroda75)
  F8V: Jaschek64(most),Houk99
  G5: Cannon
  Houk99 note "HR 1101; 10 TAU; vSINi=10; LHS 1569; µ=0.532"
  B-V=0.575, Mv=3.57, dMv=-0.74. Adequate "F9IV-V" standard.