F1V Garrison94 does not list an F1V anchor standard, and MK73 does list an F1V dagger standard. 37 UMa appears to be the best F1V standard available. Houk/Michigan classifications: Only 3 stars were classified F1V in Houk's Michigan Spectral Catalogues (HD 29875, 40136, 110379). Two were classified F2V by Gray et al. (2006), which relied on MK standards from MK78 and the Gray/Garrison surveys from the late 1980s. Houk/Michigan F1V stars appear to map to subtype F2V on the modern MK system. Cowley69 standard: 37 UMa - F1V Morgan71 standard: Rho Gem - F1V (but Morgan65 calls it a fundamental F0V standard!) Cowley74 standard: 37 UMa - F1V Strassmeier90 stan: alf01 CVn (HR 4914) - F1V Gray01/03/06 lists 14 F1V stars. Median HIP colors: (F1V) = 0.313 (+-0.005 sem, +-0.014 stdev; N=14) (F1V) = 0.368 (+-0.008 sem, +-0.026 stdev; N=14) For F1V Hipparcos stars within 75pc, with parallax S/N > 8, and within 1 mag of the MS (N=6): (F1V) = 0.377 (+-0.019 sem, +-0.049 stdev; N=6) (F1V) = 0.443 (+-0.025 sem, +-0.064 stdev; N=6) (F1V) = 0.715 (+-0.035 sem, +-0.102 stdev; N=6) (F1V) = 0.849 (+-0.047 sem, +-0.127 stdev; N=6) (F1V) = 0.891 (+-0.047 sem, +-0.128 stdev; N=6) (F1V) = 0.135 (+-0.019 sem, +-0.039 stdev; N=6) (F1V) = 0.046 (+-0.012 sem, +-0.024 stdev; N=6) (F1V) = 0.378 (+-0.025 sem, +-0.051 stdev; N=6) (F1V) =-0.050 (+-0.005 sem, +-0.013 stdev; N=6) (F1V) = 1.270 (+-0.068 sem, +-0.182 stdev; N=6) (F1V) = 0.377 ; 6 HIP d<75pc F1V (+-0.019 sem, +-0.049 stdev) (B-V)(F1V) = 0.34 ; Fitzgerald70 (B-V)(F1V) = 0.34 ; Strassmeier90 (B-V)(F1V) = 0.335 +-0.005; prim. stan. 37 UMa (B-V)(F1V) = 0.331 ; BakisEker22 (B-V)(F1V) = 0.33 ; halfway between well-determined F0V (0.29) and F2V (0.37) (B-V)(F1V) = 0.329 ; smoothed trend SpT vs (B-V)o B9.5V-F4V 11/2021 (B-V)(F1V) = 0.325 ; Schmidt-Kaler82(halfway F0V-F2V) (B-V)(F1V) = 0.32 ; Morgan71 (F1V) = 0.313 ; 14 Gray01/03/06 F1V (+-0.005 sem, +-0.014 stdev; N=14) => adopt (B-V)(F1V) = 0.33 *** [last updated 2/22/2019] => adopt (U-B)(F1V) = 0.024 => adopt (V-I)(F1V) = 0.381 => adopt (V-R)(F1V) = 0.187 => adopt (R-I)(F1V) = 0.193 => adopt (V-J)(F1V) = 0.655 => adopt (V-H)(F1V) = 0.772 => adopt (V-Ks)(F1V) = 0.819 => adopt (H-Ks)(F1V) = 0.047 => adopt (J-H)(F1V) = 0.117 (G-V)(F1V) = -0.10254 ; HD_58946_ F1V_ (G-V)(F1V) = -0.08868 ; HD_21844_ F1V (G-V)(F1V) = -0.08406 ; HD_109799_ F1V_ (G-V)(F1V) = -0.082 ; SIMBAD d<60pc F dwarf fit as f(B-V=0.33) (G-V)(F1V) = -0.075 ; Gray01/03/06 F dwarf fit for B-V=0.33 (see F0V.txt) (G-V)(F1V) = -0.07486 ; HD_11257_ F1V (G-V)(F1V) = -0.07016 ; HD_141891_ F1V_ (G-V)(F1V) = -0.06361 ; HD_225003_ F1V_ (G-V)(F1V) = -0.06316 ; HD_40292_ F1V_ (G-V)(F1V) = -0.05769 ; HD_105452_ F1V_ (G-V)(F1V) = -0.05665 ; HD_86629_ F1V_ (G-V)(F1V) = -0.05505 ; HD_206043_ F1V(n)_ (G-V)(F1V) = -0.04946 ; HD_219080_ F1V_ => adopt (G-V)(F1V) = -0.07 [updated 10/30/2020] (Bp-Rp)(F1V) = 0.4324 ; HD_27290 (Bp-Rp)(F1V) = 0.434 ; color trend for B-V=0.33 (Bp-Rp)(F1V) = 0.4350 ; HD_167858 (Bp-Rp)(F1V) = 0.474 ; Evans18 trend for V-I=0.381 (Bp-Rp)(F1V) = 0.4766 ; 37_UMa => adopt (Bp-Rp)(F1V) = 0.435 [updated 11/18/2020] (Bp-G)(F1V) = 0.160 ; color trend for B-V=0.33 (Bp-G)(F1V) = 0.1844 ; HD_167858 (Bp-G)(F1V) = 0.2196 ; 37_UMa (Bp-G)(F1V) = 0.2536 ; HD_27290 => adopt (Bp-G)(F1V) = 0.16 [updated 11/18/2020] (G-Rp)(F1V) = 0.1788 ; HD_27290 (G-Rp)(F1V) = 0.2506 ; HD_167858 (G-Rp)(F1V) = 0.2571 ; 37_UMa (G-Rp)(F1V) = 0.275 ; color trend for B-V=0.275 => adopt (G-Rp)(F1V) = 0.275 [updated 11/18/2020] (Ks-W1)(F1V) = 0.050 ; EEM trend for d<30pc for B-V=0.330 => adopt (Ks-W1)(F1V) = 0.050 [updated 12/29/2019] (U-B)(F1V) = 0.00 ; Fitzgerald70 (U-B)(F1V) = -0.008 ; HIP d<75pc S/N>8 F1V N=12 (Mermilliod91 photometry) (g-r)(F1V) = 0.193 ; Jordi06 (V-R)=>(g-r) for V-R=0.187 (g-r)(F1V) = 0.145 ; Covey07 intepr F0V-F2V (g-r)(F1V) = 0.119 ; Bilir05 (B-V)=>(g-r) for B-V=0.33 => adopt (g-r)(F1V) = 0.14 [updated 10/10/2020] Teff(F1V) = 6798 K ; Boyajian12 Teff(F1V) = 6869 K ; B-V=0.334 => Teff(Saxner85) Teff(F1V) = 6913 K ; deprecated stan. rho Gem Teff(F1V) = 6933 K ; non-stan. HD 213135 (median Teff, see below) Teff(F1V) = 6938 K ; B-V=0.334 => Teff(Casagrande10) Teff(F1V) = 6950 K ; V-K=0.828 => Teff(Mozurkewich03) Teff(F1V) = 6951 K ; B-V=0.334 => Teff(Napiwotzski93) Teff(F1V) = 6960 K ; mean photometric Teff Teff(F1V) = 6990 K ; pri. stan. 37 UMa median Teff Teff(F1V) = 7027 K ; V-H=0.781 => Teff(Casagrande10) Teff(F1V) = 7033 K ; V-K=0.828 => Teff(vanBelle09) Teff(F1V) = 7040 K ; B-V=0.334 => Teff(Ramirez05) Teff(F1V) = 7045 K ; Schmidt-Kaler82 (halfway F0V-F2V) Teff(F1V) = 7050 K ; Teff from smoothed SpT(Teff) trend Teff(F1V) = 7050 K ; median Teff for 6 F1V from Gray17 Teff(F1V) = 7066 K ; median Teff for 70 F1V published Teffs Teff(F1V) = 7088 K ; non-stan. HD 167858 (median Teff) Teff(F1V) = 7089 K ; V-K=0.828 => Teff(Casagrande10) Teff(F1V) = 7106 K ; Gray03/06 F1Vs median from TIC9/Stassun19 (N=9) Teff(F1V) = 7120 K ; GrayCorbally09 Teff(F1V) = 7135 K ; V-J=0.662 => Teff(Casagrande10) Teff(F1V) = 7172 K ; non-stan. HD 27290 median Teff Teff(F1V) = 7212 K ; B-V=0.334 => Teff(Bessell98,dwarf) => adopt Teff(F1V) = 7020 K (logT = 3.846) [updated 9/20/2019 ***] logg(F1V) = 4.2 ; median logg for 6 F1V from Gray17 V-K(F1V) = 0.832 +- 0.042 ; N=2 Gray06 F1V w/ grade A Ks mag & HIP V BCv(F1V) = 0.073 mag ; Balona94(Teff=7020K, set so BCv(5772K)=-0.085) BCv(F1V) = 0.064 mag ; Bertone04(ATLAS,Teff=7020K, set so BCv(5772K)=-0.085) BCv(F1V) = 0.027 mag ; Flower96(Teff=7020K, set so BCv(5772K)=-0.085) BCv(F1V) = 0.030 mag ; Schmidt-Kaler82(halfway F0-F2 + 0.13 mag offset) BCv(F1V) = 0.004 mag ; Masana06(Teff=7020K, set so BCv(5772K)=-0.085) BCv(F1V) = 0.000 mag ; Code76(Teff=7020K, set so BCv(5772K)=-0.085) BCv(F1V) =-0.008 mag ; Bessell98(ATLAS9,logg=4.5,Teff=7020K, set so BCv(5772K)=-0.085) BCv(F1V) =-0.010 mag ; Casagrande18(Teff=7030K,logg=4.5, set so BCv(5772K)=-0.085 => adopt BCv(F1V) = 0.005 [last updated 9/20/2019, set so BCv(5772K)=-0.085] Mv(F1V) = 3.15 mag ; Schmidt-Kaler82(halfway F0V-F2V) Mv(F1V) = 2.83 mag ; d<60pc median F1V (N=18) Mv(F1V) = 2.8 mag ; GrayCorbally09 Mv(F1V) = 2.78 mag ; d<60pc Mv(B-V=0.33) Mv(F1V) = 2.76 mag ; linear B-V vs. Mv fit to d<50pc Gray01/03/06 dwarfs for B-V=0.33 Mv(F1V) = 2.74 mag ; B-V=0.334 => Mv(Wright05) Mv(F1V) = 2.73 mag ; interp BAF dwarf seq for B-V=0.33 Mv(F1V) = 2.73 mag ; median for SIMBAD F1V d<25pc (N=5) Mv(F1V) = 2.69 mag ; A/F dwarf sequence for B-V=0.33 Mv(F1V) = 2.64 mag ; F dwarf trend standards/exemplars Mv(F1V) = 2.63 mag ; B-V=0.334 => EEM fit to SIMBAD dwarfs d<25pc Mv(F1V) = 2.38 mag ; Wegner07 => adopt Mv(F1V) = 2.76 mag [updated 9/26/2020] => adopt M_G(F1V) = 2.69 mag [updated 12/10/2020] (Mv=2.76, G-V=-0.07) => adopt M_Ks(F1V) = 1.941 mag [updated 12/30/2020] (Mv=2.76, V-Ks=0.819) logL(F1V) = 0.818 dex ; Mv=2.69 & BCv=0.005 => Mbol = 2.695 logL(F1V) = 0.790 dex ; Mv=2.76 & BCv=0.005 => Mbol = 2.765 => adopt logL(F1V) = 0.790 dex [updated 9/26/2020] => adopt Mbol(F1V) = 2.765 mag [updated 9/26/2019] Mass(F1V) = 1.53 Msun ; HenryMcCarthy93 for Mv=2.8 Mass(F1V) = 1.52 Msun ; EEM Teff vs. Mass fit for binaries (Teff=7020K) Mass(F1V) = 1.50 Msun ; EEM logL vs. Mass fit for binaries (logL=0.774) Mass(F1V) = 1.50 Msun ; Ekers18 ML calibration for logL=0.774 Mass(F1V) = 1.5 Msun ; mass for primary standard 37 UMa Mass(F1V) = 1.48 Msun ; EEM Mv vs. Mass fit for binaries (Mv=2.8) => adopt Mass(F1V) = 1.50 Msun [updated 12/29/2019] Rad(F1V) = 1.734 Rsun ; logL=0.818, Teff=7020K Rad(F1V) = 1.681 Rsun ; smoothed SpT vs Rad trend A/F dwarfs Rad(F1V) = 1.6787 Rsun ; logL=0.790, Teff=7020K Rad(F1V) = 1.670 Rsun ; Gray03/06 F1Vs median from TIC9/Stassun19 (N=9) Rad(F1V) = 1.666 Rsun ; Stassun/TICv8 Rads for smoothed trend for Gray03/06 FVs (Teff=7020K) Rad(F1V) = 1.655 Rsun ; rho Gem F1V (Boyajian12) => adopt Rad(F1V) = 1.679 Rsun [updated 9/26/2020] # No Standard Houk75 does not provide an F1V standard, and does not treat F1 as a full type (she does list five "F1" HD stars, but they all have comments) JM53, Morgan65, MK73, Houk75, Cowley76, MK78, Keenan85, GrayGarrison89, Gray89, Keenan85, GrayNstars also do not list a F1V standard. Skiff08 does not flag any stars as F1V MK standards. GrayGarrison89 and Gray89 do not define a F1V standard, but does list 14 stars that they classify as F1V (including 37 UMa). # Primary Standard HD 91480 = 37 UMa = HR 4141 (V=5.2) A9Vs: Adams35 F0: Cannon *F1V: Roman49,Morgan53,Jaschek64(all),Cowley69(stan),Cowley74(stan),GrayGarrison89 F2V: Levato78,Gray03 GrayGarrison89 did not list a F1V standard, but they do classify 37 UMa as F1V, in agreement with Cowley (although Gray03 later calls it F2V?). Morgan53 lists only one F1V star (37 UMa), but it was not technically a standard. At least decent agreement among Roman, Morgan, Cowley, Gray, Garrison on "F1V". V=5.16(HIP), B-V=0.349+-0.019(HIP), B-V=0.335+-0.005 (Mermilliod91), V-I=0.39+-0.03, 2MASS is saturated. Teffs: 6898+-80K(Casagrande11), 6960(Gerbaldi07#2), 6972(Gray03), 6990(Gerbaldi07#1), 7000(Suchkov03), 7003(Marsakov05), 7014K(Ammler-vonEiff12) => =6990 K. Only slightly subsolar - UMa member. Mass of ~1.5 Msun and logg=4.3. logg=4.21 (Casagrande11). vsini=36.9+-4.0 km/s (Ammler-vonEiff12). # Deprecated Standard HD 58946 = rho Gem F0V: JM53,Jaschek64,Morgan65,Jaschek78 F0V+: Gray89 (MgII 4481A sl wk) F0: Cannon *F1V: Morgan71,Gray03 F1mA9V: Garrison72(stan) F2-3VA S: Kennedy83 "A" is a spectroscopic binary (Worley96), so not an ideal standard. B-V = 0.316 (Mermilliod91). No Houk type, literature types disagree a bit, and it is a spectroscopic binary. Morgan65 uses rho Gem as the F0V "fundamental classification standard", but then Morgan71 calls its F1V. Too much use as F0V standard to take seriously as F1V standard. Median Teff = 6913K (N=8 PASTEL). # Exemplars HD 167858 = HR 6844 *F1V: GrayGarrison89(F1V+),Gray89(F1V+),Abt95 F2V: Cowley74 Never considered a standard by anyone. At least Gray, Garrison, & Abt agree on F1V. PASTEL: = 7088(N=6). HD 27290 = HR 1338 = gam Dor F0V: Houk75(Garrison) *F1V+: GrayGarrison89,Gray89,Gray06(F1V) F2IV: Evans64 F2V: 1937AnHar.105...45H,Cucchiaro78 F4III: Malaroda75 Teff = 7172K (N=2 PASTEL). HD 40136 = eta Lep = HR 2085 F0V: Slettebak55, F0IV: 1974PASP...86...70C,Cowley74 *F1V: Houk88(Garrison),GrayGarrison89 F1III: Malaroda75 F2V: Adams35,Barry70(uv metals v weak),Cucchiaro78(S2/68),Gray06 F2IV: Adt95 F5IV: Maury1897 # Other Stars Morgan65 did not classify any Hyads as F1V. HD 29875 = HR 1502 F1V: Moore51(F1),1937AnHar.105...45H,Houk78(Garrison),Gray89 F2V: Evans57,Malaroda75,1978A&AS...35...75C(F2m),Gray06 Probably averages to ~F1.5V. HD 168092 = HR 6849 F0V+F0V: Abt88 F0IV:s+F0IV:s: Abt69 *F1V: Adams35,Cowley74,Abt09 F2V: Abt81 SB2. 4 different classifications by Abt! HD 213135 = HR 8563 F0V: 1953AnHar.119....1H,DeVaucouleurs57,Evans57,Houk82 *F1V: Malaroda75,GrayGarrison89,Abt95 Everyone agrees dwarf. PASTEL: Median Teff = 6933K. HD 141891 = bet TrA = HR 5897 = HIP 77952 F0V: DeVaucouleurs57 F0IV: GrayGarrison89 F0III/IV: Houk75 *F1V: 1937AnHar.105...45H,Gray06 F2V: 1955MmMtS..12....1W F2III: Malaroda75 F2IV: Evans57 F2m: 1978A&AS...35...75C Very nearby ~F1V star (~12.4 pc). Types all bracket F0-F2 and V-III, with most recent Gray06 F1V. Included here as it has an interferometrically measured diameter (Rains20). V=2.83(HIP), V=2.845+-0.006(Mermilliod91), B-V=0.296+-0.005(Mermilliod91), U-B=0.041+-0.012(Mermilliod91). plx=81.24+-0.62mas(HIP2), plx=79.4292+-0.5786mas(GaiaDR2). Mv=2.345+-0.017. Rains20: tetLD=1.462+-0.013, Rad=1.976+-0.021Rsun, fbol=(188.2+-2.1)e-8 erg/s/cm2 (=> mbol = 2.816+-0.012 IAU2015), Teff=7171+-35K, L=9.30+-0.017 Lsun => logL= 0.968+-0.001. BCv = mbol - V = 2.816+-0.012 - 2.845+-0.006 = -0.029+-0.013). HD 25867 = HR 1269 = BD+28_619 ApCrEuSr: 1978A&AS...35...75C F0: 1954ArA.....1..425A *F1V: Adams35, Cowley74, Jaschek80(F1V delta Del?)