F9V Garrison94 does not list an F9V anchor type, but MK73 lists two dagger standards: bet Vir & HD 27383 (however neither of these seem to be used much in recent studies). Unfortunately the late-F/early-G standards have shifted a bit over time. There are decent primary F8V and G0V standards (HD 27808 & bet CVn, respectively), so one may not want to even use a F9V standard (see notes below on individual "standards"). Inexplicably there is little agreement between Morgan's and Keenan's work as to the choice of F9V standard. This is all the more irritating as the two co-authored the MK73 review in the 1970's, but when Keenan decided to include late F standards in his 1980's standard star tables, there was very little continuity with Morgan's choice of standards. JohnsonMorgan53 and Morgan53 had B-V=0.53 as the mean color for F8V and B-V=0.60 for G0V, with the one listed F9V star (chi Her = HD 142373) with B-V=0.56 (however this star is now known to be fairly metal poor [Fe/H]~-0.4). The Morgan F9V standards have B-V ~ 0.51-0.52. The Keenan F9V standards have B-V ~ 0.53-0.59. PecautMamajek16 estimate that F8/G0V stars in the Houk/MSS catalogs correspond most closely to F9V on the modern grid (Gray MK types). Keenan80 only lists one F standard, the F9.5V HR 7162 (HD 176051). Keenan89 does not list an F9V standard, but a F9IV-V one: HD 22484. Keenan89 lists eta Cas A as a non-standard F9V star. Keenan99 lists 3 F9V stars, but none are flagged as primary standards. Garrison72 standard: bet Vir - F9V MK73 dagger standards: bet Vir - F9V (dagger; Table 1) 55 Tau (=HD 27383) - F9V (dagger; Table 1) MorganAbt73 standards: bet Vir - F9V 55 Tau (=HD 27383) - F9V HD 27691 - F9V (and lists all three with B-V=0.56). Houk75 standard: bet Vir - F9V (but considered F8V until MK73) Cowley76 standards: bet Vir - F9V chi Her - F9V Keenan83 standard: 10 Tau (=HD 22484) - F9IV-V Keenan85 standard: HR 7162 (="BS 7162") - F9V eta Cas A - F9V HD 10647 - F9V 10 Tau (=HD 22484) - F9IV-V Corbally86 standard: bet Vir - F9V Keenan88 standards: HD 10647 - F9V eta Cas A - F9V Keenan89 standards: HD 10647 - F9V 10 Tau (=HD 22484) - F9IV-V Gray89 standard: 55 Tau (=HD 27383) - F9V Strassmeier90 standard: bet Vir - F9V Keenan99 standards: eta Cas A, HD 10647, HD 84117 (all secondary stan.) - F9V GrayNstars standards: eta Cas A, HD 10647 (=HR 506) - F9V 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) Skiff20 flags three stars as F9V MK standards: HD 27691 (Morgan73), HD 102870 (MK73), HD 27383 (MK73). For F9V Hipparcos stars within 75pc, with parallax S/N > 8, and within 1 mag of the MS (N=26): (F9V) = 1.099 (+-0.016 sem, +-0.066 stdev) (F9V) = 1.353 (+-0.017 sem, +-0.082 stdev) (F9V) = 1.425 (+-0.008 sem, +-0.082 stdev) (F9V) = 0.256 (+-0.005 sem, +-0.025 stdev) (F9V) = 0.073 (+-0.005 sem, +-0.021 stdev) (F9V) = 0.607 (+-0.005 sem, +-0.026 stdev) (F9V) =-0.064 (+-0.003 sem, +-0.010 stdev) (F9V) = 1.981 (+-0.023 sem, +-0.093 stdev) (B-V)(F9V) = 0.575 ; variant standard HD 22484 (F9IV-V) (B-V)(F9V) = 0.571 ; exemplar HD 7570 = HR 370 = nu Phe F9V Fe+0.4 ([Fe/H] ~ +0.17) (B-V)(F9V) = 0.568 ; exemplar HD 108954 = HR 4767 ([Fe/H] ~ -0.12) (F9V) = 0.564 (+-0.004 sem, +-0.021 stdev); HIP d<75pc S/N>8 (N=57) (B-V)(F9V) = 0.563 ; Gray03/06 F9Vs trend [M/H] xHIP for [M/H]=0 (B-V)(F9V) = 0.563 ; interp F8V-G0V by Teff (B-V)(F9V) = 0.561 ; exemplar HD 17051 = HR 810 = iot Hor F9V Fe+0.3 ([Fe/H] ~ +0.15) (F9V) = 0.56 ; Morgan71 (B-V)(F9V) = 0.56 ; MorganAbt73(based on bet Vir, 55 Tau, HD 27691) (B-V)(F9V) = 0.56 ; Fitzgerald70 (B-V)(F9V) = 0.56 ; Morgan53 B-V color for only F9V (chi Her) (B-V)(F9V) = 0.56 ; median CATSUP d<30pc sample (N=15) (F9V) = 0.552 (+-0.005 sem, +-0.036 stdev); Gray01/03/06 (N=57) (B-V)(F9V) = 0.550 ; d<60pc SIMBAD F9V (N=56) (B-V)(F9V) = 0.55 ; KenyonHartmann95 (B-V)(F9V) = 0.55 ; Strassmeier90 (B-V)(F9V) = 0.55 ; Schmidt-Kaler82(halfway F8V-G0V) (B-V)(F9V) = 0.548 ; median SIMBAD F9V d<25pc (N=25) (B-V)(F9V) = 0.546 ; trend for xHIP d<25pc for [Fe/H]=0.0 (B-V)(F9V) = 0.54 ; pri. stan. HD 10647 (~solar metallicity) (B-V)(F9V) = 0.539 ; exemplar HD 28635 (Hyad) (B-V)(F9V) = 0.535 ; ter. stan. HD 84117 ([Fe/H] ~ -0.05) => adopt (B-V)(F9V) = 0.56 *** [last updated 10/26/2020] [EEM 9/24/2020: note among field stars classified F9V by Gray01/03, metal poor outnumber metal rich by ~4:1, so need to look at [Fe/H] vs. B-V trend for F9Vs. Trend show that original color estimate by ] => adopt (U-B)(F9V) = 0.013 *** NEED TO UPDATE THESE FOR SHIFT IN B-V 9/2020 => adopt (V-I)(F9V) = 0.618 => adopt (V-R)(F9V) = 0.311 => adopt (R-I)(F9V) = 0.307 => adopt (V-J)(F9V) = 1.036 => adopt (V-H)(F9V) = 1.272 => adopt (V-Ks)(F9V) = 1.335 => adopt (H-Ks)(F9V) = 0.063 => adopt (J-H)(F9V) = 0.236 (G-V)(F9V) = -0.1784 ; HD_63077_ F9V_ (G-V)(F9V) = -0.168 ; HD_223084_ F9V_ (G-V)(F9V) = -0.16778 ; HD_45067_ F9V_ (G-V)(F9V) = -0.16243 ; HD_193307_ F9V_ (G-V)(F9V) = -0.16 ; HD_144766_ F9V_ (G-V)(F9V) = -0.155 ; HD_101959_ F9V_ (G-V)(F9V) = -0.154 ; HD_36108_ F9V_ (G-V)(F9V) = -0.15292 ; HD_112164_ F9Vp_ (G-V)(F9V) = -0.15274 ; HD_147584_ F9V_ (G-V)(F9V) = -0.1507 ; HD_189340_ F9V_ (G-V)(F9V) = -0.146 ; HD_180409_ F9V_ (G-V)(F9V) = -0.1454 ; exemplar HD 28635 = Cl Melotte 25 88 (Hyad) (G-V)(F9V) = -0.145 ; initial coarse estimate (G-V)(F9V) = -0.145 ; HD_133295_ F9V_CH-0.4 (G-V)(F9V) = -0.144 ; HD_62848_ F9V_ (G-V)(F9V) = -0.143 ; HD_9782_ F9V_ (G-V)(F9V) = -0.143 ; ter. stan. HD 84117 = HR 3862 (G-V)(F9V) = -0.141 ; Gray01/03/06 F dwarf sequence for B-V=0.550 (G-V)(F9V) = -0.13951 ; HD_4614_ F9V (G-V)(F9V) = -0.138 ; pri. stan. HD 10647 = HR 506 F9V (G-V)(F9V) = -0.137 ; HD_27691_ F9V+ (G-V)(F9V) = -0.13637 ; HD_190422_ F9V_CH-0.4 (G-V)(F9V) = -0.136 ; HD_6735_ F9V_ (G-V)(F9V) = -0.13555 ; HD_157060_ F9V:_ (G-V)(F9V) = -0.132 ; HD_27406_ F9V+ (G-V)(F9V) = -0.12945 ; HD_103026_ F9V_ (G-V)(F9V) = -0.12413 ; HD_176051_ F9V (G-V)(F9V) = -0.123 ; HD_167954_ F9V_ => adopt (G-V)(F9V) = -0.145 [updated 10/30/2020] (Ks-W1)(F9V) = 0.057 ; EEM trend for d<30pc for B-V=0.550 => adopt (Ks-W1)(F9V) = 0.057 [updated 12/29/2019] (Bp-Rp)(F9V) = 0.6872 ; HD_84117 (Bp-Rp)(F9V) = 0.7044 ; HD_28635 (Bp-Rp)(F9V) = 0.71 ; Bp-G=0.32, G-Rp=0.39 (Bp-Rp)(F9V) = 0.7109 ; HD_10647 (Bp-Rp)(F9V) = 0.7215 ; HD_17051 (Bp-Rp)(F9V) = 0.7255 ; HD_7570 (Bp-Rp)(F9V) = 0.728 ; trend for B-V=0.56 (Bp-Rp)(F9V) = 0.7308 ; HD_108954 (Bp-Rp)(F9V) = 0.759 ; Evans18 trend for V-I= 0.618 => adopt (Bp-Rp)(F9V) = 0.71 [updated 11/22/2020] (Bp-G)(F9V) = 0.2958 ; HD_28635 (Bp-G)(F9V) = 0.3088 ; HD_108954 (Bp-G)(F9V) = 0.32 ; Bp-Rp=0.71, G-Rp=0.39 (Bp-G)(F9V) = 0.3220 ; HD_10647 (Bp-G)(F9V) = 0.325 ; trend for B-V=0.56 (Bp-G)(F9V) = 0.3375 ; HD_17051 (Bp-G)(F9V) = 0.3459 ; HD_84117 (Bp-G)(F9V) = 0.3591 ; HD_7570 => adopt (Bp-G)(F9V) = 0.32 [updated 11/22/2020] (G-Rp)(F9V) = 0.3413 ; HD_84117 (G-Rp)(F9V) = 0.3664 ; HD_7570 (G-Rp)(F9V) = 0.3840 ; HD_17051 (G-Rp)(F9V) = 0.3889 ; HD_10647 (G-Rp)(F9V) = 0.39 ; Bp-G=0.32, Bp-Rp=0.71 (G-Rp)(F9V) = 0.404 ; trend for B-V=0.56 (G-Rp)(F9V) = 0.4087 ; HD_28635 (G-Rp)(F9V) = 0.4220 ; HD_108954 => adopt (G-Rp)(F9V) = 0.39 [updated 11/22/2020] (U-B)(F9V) = 0.04 ; Fitzgerald70 (U-B)(F9V) = 0.037 ; HIP d<75pc S/N>8 F9V N=42 (Mermilliod91 photometry) (F9V) = 0.623 (+-0.005 sem, +-0.032 stdev); Gray01/03/06 (N=57) (F9V) = 0.638 (+-0.007 sem, +-0.023 stdev); HIP d<75pc S/N>8 (N=26) (g-r)(F9V) = 0.391 ; Jordi06 (V-R)=>(g-r) for V-R=0.311 (g-r)(F9V) = 0.378 ; Bilir05 (B-V)=>(g-r) for B-V=0.56 (g-r)(F9V) = 0.37 ; Covey07 interp F8V-G0V => adopt (g-r)(F9V) = 0.38 [updated 10/10/2020] Teff(F9V) = 6010 K ; GrayCorbally09 Teff(F9V) = 6010 K ; GrayCorbally94 Teff(F9V) = 6018 K ; Gray03/06 F9Vs trend [M/H]=0 for Brewer16 [Teff = 6018K + 197K*[M/H]; rms=97K] Teff(F9V) = 6025 +- 105 K ; vanBelle09 Teff(F9V) = 6033 K ; Gray03/06 F9Vs median from TIC9/Stassun19 (N=25) Teff(F9V) = 6040 K ; Teff from smoothed SpT(Teff) trend Teff(F9V) = 6042 K ; median of 319 published Teffs for F9V stars Teff(F9V) = 6044 K ; mean photometric Teff Teff(F9V) = 6057 K ; PASTEL N=378 Teffs trend for [Fe/H]=0.0 (rms=100K) Teff(F9V) = 6067 K ; Boyajian12 Teff(F9V) = 6089 K ; Teff for d<30pc [Fe/H]=+-0.1 dex dwarfs from Hinkel17 for B-V=0.552 Teff(F9V) = 6114 K ; pri. stan. HD 10647 (~solar metallicity) Teff(F9V) = 6115 K ; Schmidt-Kaler82(halfway F8V-G0V) Teff(F9V) = 6124 K ; exemplar HD 28635 = Cl Melotte 25 88 (Hyad) Teff(F9V) = 6147 K ; exemplar HD 17051 = HR 810 = iot Hor ([Fe/H] ~ +0.15) Teff(F9V) = 6160 K ; ter. stan. HD 84117 => adopt Teff(F9V) = 6050 K (logT = 3.782) [updated 10/30/2020] BCv(F9V) = -0.019 mag ; Balona94(Teff=6060K) BCv(F9V) = -0.021 mag ; Bertone04(Teff=6060K,ATLAS) BCv(F9V) = -0.040 mag ; Schmidt-Kaler82(BCv=-0.17 + 0.13 offset) BCv(F9V) = -0.041 mag ; Flower96(Teff=6060K) BCv(F9V) = -0.049 mag ; Masana06(Teff=6060K) BCv(F9V) = -0.052 mag ; Casagrande18(Teff=6060K,logg=4.5) BCv(F9V) = -0.052 mag ; EEM fit to Casagrande06/08/10(Teff=6060K) BCv(F9V) = -0.053 mag ; Bessell98(ATLAS9,logg=4.5,Teff=6060K) BCv(F9V) = -0.056 mag ; Code76(Teff=6060K) => adopt BCv(F9V) = -0.05 mag [last updated 8/31/2019; adjusted so that BCv(5772K)=-0.085] Mv(F9V) = 4.32 mag ; pri. stan. HD 10647 ([Fe/H] ~ -0.03) Mv(F9V) = 4.28 mag ; B-V=0.56 => EEM fit to SIMBAD dwarfs d<25pc Mv(F9V) = 4.26 mag ; xHIP |[Fe/H]|<0.2 dex d<25pc dwarf only for B-V=0.56 Mv(F9V) = 4.24 mag ; median SIMBAD F9V d<25pc (N=25) Mv(F9V) = 4.21 mag ; B-V=0.56 => Mv(Wright05) Mv(F9V) = 4.2 mag ; Schmidt-Kaler82 Mv(F9V) = 4.2 mag ; GrayCorbally09 Mv(F9V) = 4.19 mag ; HD 28635 (Hyad) Mv(F9V) = 4.19 mag ; d<60pc SIMBAD F9V N=56 Mv(F9V) = 4.18 mag ; F dwarf trend standards/exemplars Mv(F9V) = 4.15 mag ; Gray01/03/06 dwarfs, xHIP B-V/Mv, Gaspar16 |[Fe/H]|<0.05 "solar": fit for B-V=0.55 Mv(F9V) = 4.14 mag ; linear fit to Gray01/03/06 dwarf sequence (d<50pc) for B-V=0.55 Mv(F9V) = 4.05 mag ; ter. stan. HD 84117 Mv(F9V) = 3.61 mag ; Wegner07 Mv(F9V) = 3.57 mag ; variant stan. HD 22484 (F9V-IV) => adopt Mv(F9V) = 4.25 mag [updated 10/30/2020] => adopt M_G(F9V) = 4.105 mag [updated 12/10/2020] (Mv=4.25, G-V=-0.145) => adopt M_Ks(F9V) = 2.915 mag [updated 12/30/2020] (Mv=4.25, V-Ks=1.335) logL(F9V) = 0.216 dex ; Mv=4.25, BCv=-0.05 => Mbol = 4.200 => adopt logL(F9V) = 0.216 dex [updated 10/30/2020] => adopt Mbol(F9V) = 4.200 mag [updated 10/30/2020] Rad(F9V) = 1.226 Rsun ; Stassun/TICv8 Rads for smoothed trend for Gray03/06 FVs (Teff=6060K) Rad(F9V) = 1.226 Rsun ; Gray03/06 F9Vs median from TIC9/Stassun19 (N=25) Rad(F9V) = 1.167 Rsun ; Teff=6050K, logL=0.216 => adopt Rad(F9V) = 1.167 Rsun [updated 10/30/2020] Mass(F9V) = 1.222 Msun ; EEM Teff vs. Mass fit for binaries (Teff=6060K) Mass(F9V) = 1.180 Msun ; HenryMcCarthy93 calibration for Mv=4.2 Mass(F9V) = 1.134 Msun ; EEM logL vs. Mass fit for binaries (logL=0.236) Mass(F9V) = 1.128 Msun ; Ekers18 ML calibration for logL=0.236 Mass(F9V) = 1.116 Msun ; EEM Mv vs. Mass fit for binaries (Mv=4.2) Mass(F9V) = 1.10 Msun ; pri. stan. HD 10647 (Ghezzi10) Mass(F9V) = 1.081 Msun ; Bertelli09 solar tracks Teff=6060K,logL=0.236 => adopt Mass(F9V) = 1.13 Msun [updated 12/29/2019] # No standard JM53, Morgan65, MK78, Keenan89 does not list an F9V standard. Although Keenan89 lists an F9IV-V standard (HD 22484) # Primary Standard HD 10647 = HR 506 = HIP 7978 = q01 Eri (J0142-5344) F8V: 1953AnHar.119....1H,Houk75 *F9V: Keenan85,Keenan88,Keenan99,Gray89,GrayNstars,Gray03 Well-characterized Keenan F9V standard of near solar metallicity. Note that Pecaut16 finds that F8Vs in Houk's catalogs correspond to ~F8.5V when compared to Gray's types. V=5.52(HIP), V=5.52(TYC), V=5.540+-0.019(Mermilliod91), B-V=0.551+-0.003(HIP), B-V=0.541+-0.003(TYC), B-V=0.540(Corben71), B-V=0.534(Oja71), B-V=0.532(Just08), B-V=0.530+-0.026(Mermilliod91), V-I=0.62+-0.00(HIP) => adopt (B-V)=0.54. plx = 57.6556+-0.0737(GaiaDR2), plx = 57.36+-0.25(HIP2), Mv=4.32(HIP2), dMv=+0.18. At least Keenan and Gray agree. One of three F9V secondary standards listed in Keenan's final list, and has solar-ish metallicity. Mass = 1.10+-0.1 Msun (Ghezzi10). PASTEL median values: =6155K(N=17), <[Fe/H]>=-0.03(N=15), =4.412(N=15), however some have large uncertainties. Best recent value seems to be Ramirez14: Teff=6114+-11K, logg=4.412+-0.036, [Fe/H]=-0.023+-0.014 (which I adopt). GaiaDR2: G=5.3549+-0.0013 => corrected Evans18 => Gcor=5.382, E(BR/RP)=1.155, Bp-Rp=0.7109, Bp-G=0.3220, G-Rp=0.3889. G-V = 5.382 - 5.52 = -0.138. # Tertiary Standard HD 84117 = HR 3862 = HIP 47592 = GJ 364 F7V: Adams35 F8V: Bidelman85(F8),Gray06 *F9V: Keenan89,Keenan99 F9IV: Jaschek78(Maloroda75),Kennedy83 G0V: Evans57,Jaschek64,Houk88,Cannon(G0) Disagreement among expert classifiers ranging from F8V (Gray06) to G0V (Houk88), but Keenan retained as F9V standard in later publications. Published B-V values range from 0.52-0.55: B-V=0.52(Mermilliod86), B-V=0.53(Johnson66,Nicolet78), B-V=0.534+-0.004(HIP), B-V=0.535+-0.012(Mermilliod91), B-V=0.535+-0.005(TYC), B-V=0.55(Feinstein66) => adopt B-V=0.535. V=4.93(HIP), V=4.92(TYC), V=4.919+-0.011(Mermilliod91), V=4.914+-0.012(Hauck97), V-I=0.58+-0.02(HIP). Mv=4.05, dMv=+0.01, par=67.2+-0.7 mas. PASTEL: = 6160K(N=12), <[Fe/H]>=-0.05(N=10). GaiaDR2: plx=67.4693+-0.1921mas, G=4.7239+-0.0030 => corrected Evans18 => Gcor=4.776, (Bp-Rp)=0.6872, (Bp-G)=0.3459 => (Bp-G)(corr)=0.294, G-Rp=0.3413 => (G-Rp)(corr)= 0.394. G-V = 4.776 - 4.919 = -0.143. # Variant Standard HD 22484 = 10 Tau = HR 1101 = HIP 16852 (J0336+0024, V=4.3) F8V: Roman50,1966ArA.....3..501L(F8),Houk99 *F9IV-V: Keenan85,Keenan89,Keenan99,Gray01 F9V: Adams35,Malaroda75 G0: Bidelman85 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. V=4.285+-0.005(Cousins71), V=4.29(HIP), V=4.293+-0.020(Mermilliod91), V=4.30(TYC), B-V=0.571+-0.003(TYC), B-V=0.572+-0.009(Mermilliod91), B-V=0.575+-0.008(HIP), B-V=0.575(Cousins71), U-B=0.058+-0.018(Mermilliod91). # Exemplars HD 28635 = Cl Melotte 25 88 = HIP 21112 (J0431+1354; V=7.78) F8: Wilson48 *F9V: Morgan65 G0: 1920AN....211..289K This is the only Hyad that Morgan65 classified as a F9V in the Hyades. V=7.78(HIP), V=7.775+-0.005(Mermilliod91), B-V=0.540+-0.019(HIP), V=0.539+-0.000(Mermilliod91), U-B=0.059+-0.000(Mermilliod91). GaiaDR2: plx=20.3839+-0.0838mas(GaiaDR2), G=7.6296+-0.0003, E(BR/RP)=1.179, Bp-Rp=0.7044, Bp-G=0.2958, G-Rp=0.4087, G-V = 7.6296 - 7.775 = -0.1454. Mv=4.321+-0.010(Mermilliod91,GaiaDR2). PASTEL: = 6124K(N=9), =4.35(N=3), <[Fe/H]>=+0.10(N=3). HD 17051 = HR 810 = iot Hor = HIP 12653 F8V: Torres06 F9V: 1953AnHar.119....1H,Bidelman85(F9),Gray89 *F9V_Fe+0.3: Gray06 G0V: Moore32(G0),Houk78 G3IV: Evans61 Exoplanet host iot Hor, with metallicity similar to Hyades. V=5.40(HIP), V=5.403+-0.011(Mermilliod91), B-V=0.561+-0.007(HIP), B-V=0.556+-0.008(Mermilliod91), V-I=0.62+-0.02(HIP), U-B=0.075+-0.005(Mermilliod91). 2MASS photometry is grade DCE (poor). PASTEL: =6142K(N=18), <[Fe/H]>=4.41(N=16), =0.153(N=15). Most precise recent analysis (adopted): Ramirez14: Teff=6147+-11K, [Fe/H] = 0.156+-0.01, logg=4.419+-0.029. HD 7570 = HR 370 = nu Phe = LHS 1220 F8V: 1955MmMtS..12....1W F9V: Gray89 *F9V Fe+0.4: Gray06 G0V: 1937AnHar.105...45H,Houk78,Bidelman85(G0) V=4.957+-0.009(Mermilliod91), V=4.96(Johnson66), V=4.96(Cousins71), V=4.97(HIP), B-V=0.565(Just08), B-V=0.571+-0.007(HIP), B-V=0.571+-0.004(TYC), B-V=0.571+-0.006(Mermilliiod91), B-V=0.575+-0.008(Cousins71), B-V=0.58(Johnson66) => B-V=0.571. PASTEL: =6114K(N=20), =4.34(N=19), <[Fe/H]>=+0.17(N=19) HD 108954 = HR 4767 F7V: Adams35 F8V: Cowley70,Jensen81 *F9V: Gray03 G0V: Cowley76 One of only two stars within 30 pc classified by Gray as F9V that is near solar. Cowley's two classifications average to F9V. V=6.20(HIP), B-V=0.568+-0.004(HIP), V-I=0.64+-0.00(HIP), H=4.891+-0.024(2MASS), Ks=4.820+-0.016(2MASS). 2MASS J is poor. V-Ks = 1.38. PASTEL: = 6037K(N=13), [Fe/H] = -0.12(N=7), logg=4.37(N=7). # Deprecated Standards HD 102870 = bet Vir = HR 4540 = HIP 57757 F7V: 1959AnTou..27...47B F8V: 1919AnHar..94.....C(stan.;F8),Adams35,Morgan53,MK43,Bidelman85(F8) *F8.5IV-V: Gray01 F9V: Garrison72(stan),MK73(dagger),MorganAbt73,Cowley76(stan),HoukStandard,Garcia89,Kennedy83,Houk99 I would feel better about its status as a standard if Gray01's value agreed with others, and Morgan hadn't shifted it (F8V in MK43 & Morgan53 vs. F9V in MK73). It appears to be much bluer than other F9Vs in Houk (although late Fs & Gs may be off 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 Teff = 6059+-49 K (North09). Yet another standard near F/G boundary with irritating poor pedigree in classification among expert classifiers over the decades. HD 27691 = Cl* Melotte 25 RG 10 F7: Schwassmann51 F8IV: Harlan69 F8V: Adams35 *F9V: MorganAbt73,Abt85(AB),Gray01(F9V+) G0V: Morgan65 HD 27691 is a 1.5" separation pair (V=7.3+8.6) Hyad. Close binary, may not be the best standard -- however Morgan/Abt/Gray agree on F9V... however Morgan changed mind between Morgan65 (G0V) and MorganKeenan73 (F9V). Arg. Colors for unresolved pair: B-V=0.518 (HIP), and for A component: B-V = 0.539+-0.023 (CCDM). HD 27383 = 55 Tau = HIP 20215 = Cl Melotte 25 29 (Hyad) F6V: Adam35, *F8V: Treanor60,Morgan65,Corbally86(stan),Gray01 F9V: 1940ApJ....91..256T,Christy69,MK73(dagger),MorganAbt73,Jaschek74,Jaschek78,Abt85,Garcia89,Gray89(stan) Close pair. This star was "the" F9V standard in Gray89 and a MorganKeenan73 dagger standard F9V, BUT it was called "F8V" by Morgan65 and recently by Gray01. The F8V classification might not be a surprise as it is bluer than other F9Vs. B-V(HIP)=0.509, Vmag=6.85, Mv=3.68, dMv=-0.18, par=23.3+-2.3 mas. Close pair. HD 4614A = eta Cas A = HR 219A = HIP 3821 = GJ 34A F8V: 1927MeUpp..28....1L(F8),Morgan37 F9V: Adams35,Keenan41,1953UppAn...3h....W,Keenan85,Keenan88,Keenan89,Hoffleit91,Keenan99,Gray01,GrayNstars,Abt08 *F9.5V: Morgan38 G0V: MK43,Moore50,JM53,Ljunggren61,Barry70(G0Vb),MorganAbt73,Cowley76(stan),KeenanMcNeil76(stan),MK78(stan),Keenan80,Abt81,Keenan83,Bidelman85(G0),Keenan85,GrayAtlas,Garrison96 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 only ~1940s-80s. Gray calls it G0V in his atlas, but F9V in his 2001 catalog. It appears G0V is where "MK" had an "M" version and a "K" version?. KeenanMcNeil76 and MK78 agree on using eta Cas as a "G0V" standard. Keenan had it as G0V in MK43, KeenanMcNeil76, Keenan83, and Keenan85 *but* changed it to F9V in Keenan88, Keenan89, Keenan99. I would recommend this star is not used as a standard given its inconsistent use by expert classifiers. HD 176051 = HR 7162 *F9V: Keenan85,Keenan89(non-stan),Gray01 F9.5V: Keenan80 G0V: Adams35,Roman52(weak lines),Harlan74,Abt81,Bidelman85(G0),Cannon(G0) It's a 1" binary, and the SpT floats in the literature. Not a great standard. Keenan85 listed it as "the" F9V standard, but just a few years after classifying it as F9.5V. HD 142373 = chi Her F8V Fe-2 Hdel-1: Keenan89 F9V: JM53,Roman55,Jaschek64(most),Cowley76(stan),Jaschek78(JM53) hF9gG0mF6: Jaschek89 F9VgG0mF7: Abt86 *G0V Fe-0.8 CH-0.5: Gray03 G0: Cannon This is the only F9V star classified by JohnsonMorgan53 and also listed in Morgan53, but it appears to be a fairly metal poor star. I adopt Gray03's type as they've looked at it closely enough to notice its Fe/CH poorness compared to other standards. PASTEL: =5851K(N=28), <[Fe/H]> = -0.445(N=22), = 4.115(N=18). # Other Stars Among the 25 "F9V"s in Gray03 and Gray06, a search of the Skiff's MK database could find *no* instances of a star where the majority of authors decided on an F9V spectral type (most classifications bounce around between ~F8V and ~G1V). This seems to emphasize the lack of agreement on spectral types near the F/G boundary. HD 147584 = HR 6098 F6(V)+G1?(V)?: Beavers80 F9V: BSC,Malaroda75,Gray06 G0V: 1937AnHar.105...45H,1953AnHar.119....1H,Houk75 Not good example of the type. Unresolved binary: SB2 12 day period. HD 79028 = HR 3648 = 16 UMa F8: 1934StoAn..11l...1L F9V: Adams35,Cowley76,Cowley79 G0IV-V: Gray03 G0V: Young77,Abt09 HD 114762 = LHS 2693 = HIP 64426 F5: 1925sdsl.book.....L F7V: Adams35 F9V: Roman55,Hill76,1986ApJ...309..260A F9VgF8mF4: Abt86 *hF9gF7mF3: Jaschek89 Famous host star for substellar object (exoplanet or brown dwarf?) HD 11476 (Latham89). Very metal poor. V=7.30(HIP), B-V=0.525+-0.013(HIP). PASTEL has 45 entries(!). Most precise recent estimates from Sousa18: Teff=5961+-26K, logg=4.43+-0.03, [Fe/H]=-0.65+-0.02. HD 137107 A = eta CrB F9V: Adams35,Abt81,Gray01(F9V+) many more types Skiff: '1" pair in 194" cpm trio'. AG+45_1285 = HIP 80953 B = CCDM J16318+4536B *F9V: Adams35,Gray01,Murphy15 All three published types agree on F9V. CCDM: 16.3" cpm pair, primary is a A2 which is ~3 mag brighter. B-V=0.610(Mermilliod91), V=8.890(Mermilliod91). HD 2475 = HR 108 F9V: Malaroda75 F9V Fe+0.5: Gray06 G0V: Abt81 G1V: Gray89,Cowley69 G3V: Houk88 close pair? Wide dispersion in types. HD 3196 = HR 142 = 13 Cet = BU Cet = GJ 23 AB (V=5.2) F6V+G1V: Gliese91 F7V: Adams35 F8V: Roman52(weak lines),Cowley69,Abt81,Bidelman85(F8),Abt09,Houk F8V+G0V: vanAltena95 *F8.5V: Gray03 F9V: Malaroda75,Gray89 Close pair (V(A)=5.20, V(B)=6.30) with small delta(mag), so probably not a good example. vanAltena95 lists the binary as V(A)=5.65, B-V(A)=0.57, V(B)=6.30, SpT(A)=F8V, SpT(B)=G0V. Note that the Houk F8V type maps to F8.5V (PecautMamajek16). Luyten79(NLTT) comments "ADS 490, orbit = 6.9y, a=0.24", A is sp.bin". V=5.20(Johnson66), V=5.200+-0.007(Mermilliod91), V=5.203+-0.005(Hauck98), B-V=0.56(Johnson66), B-V=0.564+-0.011(Mermilliod91), U-B=0.08(Johnson66), U-B=0.075+-0.005(Mermilliod91). HD 3823 = HR 176 F6/8V: Houk75 F9V: 1953AnHar.119....1H F9V m-1: Gray89 *G0V Fe-0.9 CH-0.4: Gray06 G1V: Evans61 HD 4813 = HR 235 = phi02 Cet F7IV-V: Malaroda75 F7V: Gray03 F8IV: Roman49 *F8V: Roman50,Cowley69,Levato78,Bidelman85(F8) hF8gF7mF7: Jaschek89 F9V: Adams35,Gray89 Ursa Major stream? King03 has in list of "possible activity-based members" of UMa. Oddly Gray89 has F9V but Gray03 has F7V. HD 43587 F9V: Adams35,Cowley79 *G0V: Harlan74,Gray03,Gray06 G0.5Vab: Barry70 HD 45067 = HR 2313 F8V: 1953AnHar.119....1H,Gray03 F9V: Harlan81,Gray06 G1: Bidelman85 HD 76932 G2V Fe-1.8 CH-1: Gray06 several other types HR 5322 = HD 124553 F8V: Adams35 F9V: Malaroda75,Cowley79 G0V: Cowley76 G0IV-V: Harlan74 *G0IV: Gray01 HD 125276 = HR 5356 F9V Fe-1.5 CH-0.7: Gray06 F9V m-2.25: Gray89 several others HD 126512 F8V: Joy47 F9V: Cowley67 *F9VgG0mF7: Abt86 G0: Bidelman85 HD 131473 F6III: Harlan70 F9IV/V: Adams35 *F9V: Cowley79,Abt81 Skiff: 1.5" cpm pair. HD 148816 G0V m-2.25: Gray89 hG0gF7mF5: Jaschek89 F7VgG0mF5: Abt86 several others HD 157060 = HR 6454 F7V: Malaroda75 F8V: Houk82 F9V: 1953AnHar.119....1H,Gray06(F9V:) HD 159329 F9V: Adams35,Roman55 HR 6598 = HD 160933 F9V: Cowley76 F9VgG1mF7: Abt86 *F9IV-V: Gray01 G0V: Wilson50,Cowley79 HD 167665 = HR 6836 = CPD-28_6498 F8V: 1939AnBos...5E...1W(F8),Houk82 F9V: 1953AnHar.119....1H F9V Fe-0.8 CH-0.4: Gray06 G0V: Evans57 HD 201889 F9V: Adams35,Abt81 G1V: Roman55 G wl: Bidelman85 Skiff: 1.5" cpm pair. HR 7291 *F8.5V: Gray06 F9V: 1953AnHar.119....1H, Malaroda75 HR 7766 = HD 193307 *F9V: 1953AnHar.119....1H,Gray06 G0V: Houk78 G2IV/V: Evans61 HR 7875 = HD 196378 F7V: Houk75 F8V: Evans59,Malaroda75 F9V: 1953AnHar.119....1H F9V m-1.5: Gray89 *G0V Fe-0.8 CH-0.5: Gray06 HD 214608 AB *F9V: Cowley69,Abt85 G0V: Adams35 pair. HD 221839 F7.5V: Gray06 F8V: Houk82 F9V: Cowley69,Abt85 G0IV: Evans57 Skiff: 0.7" pair with 3rd cpm companion at 162". HD 16739 = HR 788 = 12 Per = GJ 105.6 = GJ 9095 = HIP 12623 = WDS J02422+4012 F8V: Roman50,Ljunggren61(F8) *F8V+G2V: Barlow98 F9V: Adams35,Slettebak55,Abt09 F9IV-V: Gray03 WDS: 0.1" binary mag1=5.5, mag2=5.9, period=331days, K1=21.4 km/s, K2=24.8 km/s (so similar masses), discovered to be SB2 by Campbell(1900). Two in-depth studies of the system are presented by Barlow98 and Bagnuolo06 (2006AJ....131.2695B), they estimate del(V)=0.51. V=4.91(HIP), V=4.90(TYC), B-V=0.582+-0.003(HIP), V-Ic=0.62+-0.03(HIP). plx=53.18+-0.15mas(Bagnoulo06). Mass = 1.382+-0.019, 1.240+-0.017 Msun. Barlow98 suggests the system is slightly metal-rich ([Fe/H] ~ +0.1) for the combined colors. HD 70110 = HR 3271 F8V: Cowley79 *F9V: Malaroda75 G0V: Harlan74 HD 89389 = HR 4051 F9V: Cowley76,Cowley79