F4V Garrison94 does not list a F4V anchor standard, nor does MK73 list a F4V dagger standard. Strassmeier90 standard: tet Cyg (HR 7469) - F4V Pecaut12 standard: HD 27561 - F4V HIP has 46 stars w/i 75 pc classified F4V, with (F4V) = 0.425 (HIP SpTs) Gray01/03/06 lists 17 nearby F4V stars. Median colors: (F4V) = 0.412 (+-0.003 sem +-0.015 stdev; N=17) Gray01/03/06 (F4V) = 0.481 (+-0.005 sem +-0.019 stdev; N=17) Gray01/03/06 For F4V Hipparcos stars within 75pc, with parallax S/N > 8, and within 1 mag of the MS (N=21): (F4V) = 0.433 (+-0.006 sem, +-0.032 stdev; N=21) (F4V) = 0.503 (+-0.008 sem, +-0.039 stdev; N=21) (F4V) = 0.885 (+-0.022 sem, +-0.073 stdev; N=21) (F4V) = 1.055 (+-0.016 sem, +-0.097 stdev; N=21) (F4V) = 1.101 (+-0.019 sem, +-0.085 stdev; N=21) (F4V) = 0.177 (+-0.010 sem, +-0.034 stdev; N=21) (F4V) = 0.049 (+-0.007 sem, +-0.028 stdev; N=21) (F4V) = 0.449 (+-0.006 sem, +-0.029 stdev; N=21) (F4V) =-0.046 (+-0.003 sem, +-0.012 stdev; N=21) (F4V) = 1.509 (+-0.025 sem, +-0.148 stdev; N=28) (F4V) = 0.433 ; 21 HIP d<75pc (+-0.006 sem, +-0.032 stdev) (B-V)(F4V) = 0.422 ; exemplar HD 152303 = HR 6267 ([Fe/H] ~ -0.17) (B-V)(F4V) = 0.42 ; Fitzgerald70 (B-V)(F4V) = 0.42 ; MorganAbt73 halfway between F3V (0.40) & F5V (0.44) (B-V)(F4V) = 0.416 ; trend xHIP F4V d<25pc for [Fe/H]=0.0 (B-V)(F4V) = 0.415 ; halfway between F3V (0.39) and F5V (0.44) (F4V) = 0.412 ; 17 Gray01/03/06 F4V (+-0.003 sem +-0.015 stdev) (B-V)(F4V) = 0.412 ; pri. stan. HD 27561 (Hyad, Morgan65, [Fe/H] ~ +0.18) (B-V)(F4V) = 0.411 ; exemplar HD 157373 = HR 6467 ([Fe/H] ~ -0.42) (B-V)(F4V) = 0.407 ; smoothed trend SpT vs (B-V)o B9.5V-F4V 11/2021 (B-V)(F4V) = 0.407 ; standard + exemplars interp to [Fe/H] = 0.0 (B-V)(F4V) = 0.407 ; exemplar HD 160032 = HR 6569 = lam Ara ([Fe/H] ~ -0.26) (B-V)(F4V) = 0.397 ; exemplar HD 106103 = Cl Melotte 111 19 ([Fe/H] ~ -0.04) (B-V)(F4V) = 0.390 ; median SIMBAD F4V d<25pc (N=5) (B-V)(F4V) = 0.39 ; Morgan71, KenyonHartmann95 (B-V)(F4V) = 0.38 ; Strassmeier90 (B-V)(F4V) = 0.378 ; Morgan65 F4Vn Hyad HD 27901 => adopt (B-V)(F4V) = 0.41 *** [updated 10/30/2020] => adopt (U-B)(F4V) = -0.026 => adopt (V-I)(F4V) = 0.474 => adopt (V-R)(F4V) = 0.235 => adopt (R-I)(F4V) = 0.239 => adopt (V-J)(F4V) = 0.802 => adopt (V-H)(F4V) = 0.960 => adopt (V-Ks)(F4V) = 1.012 => adopt (H-Ks)(F4V) = 0.052 => adopt (J-H)(F4V) = 0.158 (G-V)(F4V) = -0.13516 ; HD_115149_ F4V_ (G-V)(F4V) = -0.132 ; HD_106103_ F4V (G-V)(F4V) = -0.12363 ; HD_160032_ F4V_ (G-V)(F4V) = -0.11938 ; HD_130819_ F4V_ (G-V)(F4V) = -0.11 ; HD_188986_ F4V_ (G-V)(F4V) = -0.10695 ; HD_219693_ F4V_ (G-V)(F4V) = -0.103 ; Gray01/03/06 F dwarf fit for B-V=0.412 (G-V)(F4V) = -0.09625 ; HD_147365_ F4V_ (G-V)(F4V) = -0.0961 ; HD_64185_ F4V_ (G-V)(F4V) = -0.09388 ; HD_220729_ F4V_ (G-V)(F4V) = -0.09189 ; HD_116457_ F4V_ (G-V)(F4V) = -0.0839 ; HD_77370_ F4V_ (G-V)(F4V) = -0.08287 ; HD_18692_ F4V_ (G-V)(F4V) = -0.08124 ; HD_139664_ F4V_ (G-V)(F4V) = -0.07896 ; HD_219571_ F4V_ => adopt (G-V)(F4V) = -0.10 [updated 10/30/2020] (Bp-Rp)(F4V) = 0.549 ; color trend for B-V=0.41 (Bp-Rp)(F4V) = 0.5533 ; HD_27561 (Bp-Rp)(F4V) = 0.5574 ; HD_106103 (Bp-Rp)(F4V) = 0.5656 ; HD_160032 (Bp-Rp)(F4V) = 0.5723 ; HD_152303 (Bp-Rp)(F4V) = 0.587 ; Evans18 trend for V-I=0.474 => adopt (Bp-Rp)(F4V) = 0.55 [updated 11/18/2020] (Bp-G)(F4V) = 0.209 ; color trend for B-V=0.41 (Bp-G)(F4V) = 0.2286 ; HD_106103 (Bp-G)(F4V) = 0.2328 ; HD_27561 (Bp-G)(F4V) = 0.2417 ; HD_152303 (Bp-G)(F4V) = 0.2836 ; HD_160032 => adopt (Bp-G)(F4V) = 0.21 [updated 11/18/2020] (G-Rp)(F4V) = 0.2820 ; HD_160032 (G-Rp)(F4V) = 0.3206 ; HD_27561 (G-Rp)(F4V) = 0.3288 ; HD_106103 (G-Rp)(F4V) = 0.3306 ; HD_152303 (G-Rp)(F4V) = 0.341 ; color trend for B-V=0.41 => adopt (G-Rp)(F4V) = 0.34 [updated 11/18/2020] (Ks-W1)(F4V) = 0.052 ; EEM trend for d<30pc for B-V=0.412 => adopt (Ks-W1)(F4V) = 0.052 [updated 12/29/2019] (U-B)(F4V) = -0.01 ; Fitzgerald70 (U-B)(F4V) = -0.025 ; HIP d<75pc S/N>8 F4V N=33 (Mermilliod91 photometry) (g-r)(F4V) = 0.271 ; Jordi06 (V-R)=>(g-r) for V-R=0.236 (g-r)(F4V) = 0.237 ; Covey07 interp F2V-F5V (g-r)(F4V) = 0.211 ; Bilir05 (B-V)=>(g-r) for B-V=0.412 => adopt (g-r)(F4V) = 0.24 [updated 10/10/2020] Teff(F4V) = 6433 K ; exemplar HD 157373 = HR 6467 ([Fe/H] ~ -0.42) Teff(F4V) = 6520 K ; Boyajian12 Teff(F4V) = 6573 K ; exemplar HD 152303 = HR 6267 ([Fe/H] ~ -0.17) Teff(F4V) = 6628 K ; exemplar HD 160032 = HR 6569 = lam Ara ([Fe/H] ~ -0.26) Teff(F4V) = 6632 K ; mean photometric Teff Teff(F4V) = 6633 K ; Gray03/06 F4Vs median from TIC9/Stassun19 (N=14) Teff(F4V) = 6646 K ; median of 165 published Teffs for F4V stars (EEM) Teff(F4V) = 6650 K ; interp. (F3V-F5V) GrayCorbally09 Teff(F4V) = 6668 K ; Teff from smoothed SpT(Teff) trend Teff(F4V) = 6670 K ; trend standard+exemplars for [Fe/H]=0.0 Teff(F4V) = 6695 K ; pri. stan. HD 27561 ([Fe/H] ~ +0.18) Teff(F4V) = 6720 K ; exemplar HD 106103 = Cl Melotte 111 19 ([Fe/H] ~ -0.04) => adopt Teff(F4V) = 6670 K (logT = 3.824) [updated 10/30/2020] BCv(F4V) = +0.059 mag ; Balona94(Teff=6670K) BCv(F4V) = +0.041 mag ; Bertone04(ATLAS,Teff=6670K) BCv(F4V) = +0.013 mag ; Flower96(Teff=6670K) BCv(F4V) = -0.010 mag ; Masana06(Teff=6670K) BCv(F4V) = -0.018 mag ; Bessell98(ATLAS9,logg=4.5,Teff=6670K) BCv(F4V) = -0.018 mag ; Casagrande18(Teff=6670K,logg=4.5) BCv(F4V) = -0.020 mag ; Code76(Teff=6670K) BCv(F4V) = -0.053 mag ; EEM fit to Casagrande06/08/10(Teff=6670K) => adopt BCv(F4V) = -0.015 [updated 10/30/2020, adjusted so that BCv(5772K)=-0.085] Mv(F4V) = 3.44 mag ; exemplar HD 157373 = HR 646 ([Fe/H] ~ -0.42) Mv(F4V) = 3.43 mag ; exemplar HD 106103 = Cl Melotte 111 19 ([Fe/H] ~ -0.04) Mv(F4V) = 3.3 mag ; GrayCorbally09 Mv(F4V) = 3.27 mag ; B-V=0.41 => G0V-K0V d<25pc [Fe/H] wi 0.2dex of solar(xHIP) Mv(F4V) = 3.24 mag ; B-V=0.41 => EEM fit to SIMBAD dwarfs d<25pc Mv(F4V) = 3.21 mag ; B-V=0.41 => Mv(Wright05) Mv(F4V) = 3.20 mag ; median for SIMBAD F4V d<25pc (N=5) Mv(F4V) = 3.20 mag ; linear B-V vs. Mv fit to d<50pc Gray01/03/06 dwarfs for B-V=0.412 Mv(F4V) = 3.17 mag ; trend for F4V standard+exemplars for [Fe/H]=0.0 Mv(F4V) = 3.16 mag ; Gray01/03/06 dwarfs, xHIP B-V/Mv, Gaspar16 |[Fe/H]|<0.05 "solar": fit for B-V=0.412 Mv(F4V) = 3.11 mag ; exemplar HD 160032 = HR 6569 = lam Ara ([Fe/H] ~ -0.26) Mv(F4V) = 3.00 mag ; pri. stan. HD 27561 ([Fe/H] ~ +0.18) Mv(F4V) = 2.84 mag ; Wegner07 => adopt Mv(F4V) = 3.20 mag [updated 10/30/2020] => adopt M_G(F4V) = 3.10 mag [updated 12/10/2020] (Mv=3.20, G-V=-0.10) => adopt M_Ks(F4V) = 2.188 mag [updated 12/30/2020] (Mv=3.20, V-Ks=1.012) [EEM 9/26/2020: note that the MS Mv locus is well-defined around F4V, so I use F4V and A0V to anchor the B-V vs. Mv linear trend for the intermediate A1V-F3V types using Gray-classified d<60pc dwarf stars] logL(F4V) = 0.622 dex ; Mv=3.2, BCv=-0.015 => Mbol = 3.185 => adopt logL(F4V) = 0.622 dex [updated 10/30/2020] => adopt Mbol(F4V) = 3.185 mag [updated 10/30/2020] Rad(F4V) = 1.601 Rsun ; Gray03/06 F4Vs median from TIC9/Stassun19 (N=14) Rad(F4V) = 1.545 Rsun ; smoothed SpT vs Rad trend A/F dwarfs Rad(F4V) = 1.5325 Rsun ; Teff=6670K,logL=0.622 Rad(F4V) = 1.523 Rsun ; Stassun/TICv8 Rads for smoothed trend for Gray03/06 FVs (Teff=6650K) => adopt Rad(F4V) = 1.533 Rsun [updated 10/30/2020] Mass(F4V) = 1.45 Msun ; pri. stan. HD 27561 Mass(F4V) = 1.415 Msun ; HenryMcCarthy93 calibration for Mv=3.2 Mass(F4V) = 1.404 Msun ; EEM Teff vs. Mass fit for binaries (Teff=6650K) Mass(F4V) = 1.385 Msun ; Ekers18 ML calibration for logL=0.622 Mass(F4V) = 1.383 Msun ; EEM logL vs. Mass fit for binaries (logL=0.622) Mass(F4V) = 1.352 Msun ; EEM Mv vs. Mass fit for binaries (Mv=3.2) Mass(F4V) = 1.350 Msun ; Bertelli09 solar tracks for Teff=6650,logL=0.622 => adopt Mass(F4V) = 1.38 Msun [updated 12/29/2019] # No standard JM53, Morgan65, MK73, MorganAbt73, Cowley74, Houk75, Cowley76, MK78, Keenan85, Corbally86, Gray89, GrayNstars do not list a F4V standard (and none in Skiff compendium). MorganAbt73 lists F3V (B-V=0.40) and F5V (B-V=0.44) standards, but no F4V standards. Houk does not treat F4 as a full type, and does not list a standard. Houk lists one F4V star in her catalogs: HD 179512, however this star has no other published classifications in the Skiff MK catalog. It would appear that there are no generally agreed-upon F4V standard stars before Pecaut13 (who adopted HD 27561). # Primary standard HD 27561 = (Hyad; one of Morgan's 2 F4V Hyads) *F4V: Morgan65,Pecaut12(stan) F5V: Jaschek64,Jaschek78(Eggen50) F5IV-V: Treanor60,Gray01 F6V: Davis77 F6: Wilson48 F0: Cannon Unfortunately, only Morgan65 calls it F4V. Color intermediate between F3V and F5V Hyades. Based on its intermediate appearance between F3V and F5V spectra and its colors, Pecaut12 adopts this as a F4V standard. (B-V)=0.408+-0.002(Mermilliod91), V=6.610(Mermilliod91), U-B=0.000(Mermilliod91). Mass = 1.43 Msun(Casagrande11), 1.47 Msun(Roeser11) => median(mass) = 1.45 Msun. PASTEL: = 6695K(N=9), = 4.35(N=3), <[Fe/H]>=-0.11(N=3). Mv=3.00(HIP,HIP2), dMv=-0.22. # Exemplar HD 152303 = HR 6267 = HIP 81854 = LTT 14974 *F4V: Cowley76,Cowley79,Wilson50 F5IV: Abt85 F1V: Joy35 2.55" binary, delta(Hp)=4.084. V(AB)=5.99(HIP), V(AB)=5.98(Mermilliod91), V(A)=6.02, B-V(A)=0.412(CCDM), B-V=0.422+-0.007(TYC=>revised locus), B-V(AB)=0.430+-0.021(HIP), B-V(AB)=0.415(Mermilliod91), Splitting magnitude assuming del(Hp)=del(V) => V(AB)=5.98, V(A)=6.00, V(B)=10.09. [Fe/H]=-0.17+-0.08(Gaspar13). plx=27.742+-0.046mas(GaiaDR2), companion has 27.939+-0.078mas. Mv(A)=3.22. Teff: 6573+-80K(Casagrande10). HD 160032 = HR 6569 = lam Ara = GJ 686.2 = HIP 86486 F3IV: Malaroda75 *F4V: Gray89,Gray06 F5V: Lu83 V=4.76(HIP,TYC), V=4.762+-0.006(Mermilliod91), V=4.764(Hauck97), B-V=0.401+-0.002(Mermilliod91), B-V=0.407+-0.006(TYC), B-V=0.415+-0.020(HIP), U-B=-0.046+-0.009(Mermilliod91). PASTEL: = 6628K(N=6), = 4.11(N=4), <[Fe/H]> = -0.26(N=4). delta(Mv)=-0.14, so just barely above MS. plx=47.1011+-0.2908mas(GaiaDR2), plx=46.62+-0.33mas(HIP2). Mv = 3.105+-0.017. HD 106103 = Cl Melotte 111 19 = GM Com (Coma Ber member) F3V: Hill76 *F4V: Gray01,Mendoza63,Trumpler38 F5V: Abt77,Westerlund56,Weaver52 Negligibly reddened: E(B-V)=0.003(Kervella19,STILISM) => Av=0.010. V=8.07(HIP), V=8.100+-0.021(Mermilliod91), B-V=0.394+-0.017(TYC), B-V=0.397(Johnson55), B-V=0.397+-0.010(HIP), B-V=0.40(Mendoza63), B-V=0.40(Sanders66), B-V=0.405+-0.017(Mermilliiod91) => (B-V)o = 0.40 - 0.003 = 0.397. U-B=-0.045+-0.014(Mermilliod91), PASTEL: = 6720K(N=8), = 4.305(N=4), <[Fe/H]> = -0.0395(N=6). plx = 11.6745+-0.0474mas(GaiaDR2). Mv=3.426+-0.023. HD 157373 = HR 6467 = HIP 84855 F2V: Harlan74 F4V: Cowley76,Cowley79 *F4VmF2: Abt86 F6Va: Barry70(uv metals vw) Metal-poor example. V=6.359+-0.002(Hauck97), V=6.36(HIP), V=6.411+-0.045(Mermilliod91), B-V=0.407+-0.015(Mermilliod91), B-V=0.411+-0.008(TYC), B-V=0.427+-0.006(HIP), U-B=-0.096+-0.005(Mermilliod91), PASTEL: =6433K(N=6), =4.105(N=4), [Fe/H]=-0.42(N=4). plx=25.22+-0.65mas(HIP2), plx = 26.0519 0.0247mas(GaiaDR2). Mv=3.438+-0.003(Hauck97,GaiaDR2). # Notes on the search for a suitable standard Gray06 lists 14 F4V stars with Teff estimates. The stars with two median Teff estimates are HD 139664 (HIP 76829) and HD 77370 (HIP 44143). HD 77370 was listed as an F3V by both Houk75 and Gray89(!). HD 139664 has a range of published types (F2-F5). Morgan65 classifed two Hyads as F4V or variant: HD 27561 (F4V) and HD 27901 (F4Vn). Morgan65 classified a few Hyades dwarfs as "F4V". His grid of fundamental standards had F3 and F6, but no intermediate standards. His F4V stars were: HD 27561 (=BD+14_687) and HD 27901 (BD+18_633). Gray01 calls HD 27561 a "F5IV-V", and most other authors consider the star F5 or F6 as well. HD 27901 is discussed later, but has been variously considered A9,F2, or F3. Neither star seem worthy of calling a standard given their range in published types. There is a noticeable lack of stars classified as F4V by multiple authors. Only four of the "pure" F4V stars from Gray et al. (2001,2003,2006) have been previously classified as F4V. None of these would seem to be worthy of calling a standard. HD 160032 at least has two Gray references with the same type. Note that Hyades F3Vs have B-V ~ 0.39, and F5Vs have B-V ~ 0.43-0.44. HD 27901 = HR 1385 = HIP 20614 = vB 53 (Hyad; one of Morgan's 2 F4V Hyads) A9V: Adams35 F2IV-V: Treanor60 F2V: Abt95 F3: 1920AN....211..289K F4V: 1940ApJ....91..256T,Morgan65(F4Vn),Cowley74 Bluer of the two Morgan65 F4Vs in Hyades, and very fast-rotating: 150km/s(vanBelle12). WDS reports it as equal-brightness 0.1" separation binary OCC921 = WDS J04249+1903. V=5.97(HIP), B-V=0.378+-0.010(Mermilliod91), B-V=0.378+-0.014(HIP), B-V=0.388+-0.007(TYC), Teffs: 6680+-66K(Masana06), 6780+-80K(Casagrande10). HD 6397 = HR 308 = 72 Psc F0V: Wilson50 F2V: Adams35 F4V: Gray01(F4V((Sr))),Cowley76 *F4II-III: Harlan69,Hoffleit91 F5V: Abt08 About 1.3 mag above main sequence, and David15 estimates low logg(4.05+-0.14) - so probably not best choice of F4V. Teffs: 6625+-80K(Casagrande11), 6626+-225K(David15). [Fe/H] = -0.09+-0.06(Gaspar16). HD 220729 = HR 8907 = HIP 115713 *F4V: Gray06,Malaroda75 F3IV: deVaucoleurs57 others without Gray et al. classifications, but maybe standard-worthy? HD 15138 = HR 709 = 66 And F4V: Cowley76,Abt69(F4V+F4V),Appenzeller67 F1V: Adams35 HD 17948 = HR 860 F4V: Wilson50,Appenzeller67,Cowley76,Cowley79 F6Va: Barry70(mw) hF6gF2mF2: Jaschek89 F5V: Gray03 looks like a good F4V standard, *but* Gray03 HD 185395 = tet Cyg F2V: Adams35 F3+V: Gray03 F4V: Abt85,Slettebak55,somebody38(error in Skiff catalog) F5IV: Roman50