G7V Garrison94 does not list a G7V anchor standard, and MK73 does not list a G7V dagger standard. Keenan84 does not list G7 as a full subtype like G5 and G8, and "other possible subdivisions are utilized only for interpolation whenever we think that we can classify accurately enough to justify their use. Thus when we call a star G3 we mean only that it is closer to G2 than to G5." HD 111395 might be the best candidate standard. The proposed candidate standard HD 111395 has B-V = 0.703, hence perfectly consistent with the median B-V color of the G7Vs in the Gray et al. papers. Houk does not treat G7 as a full type. (B-V)(G7V) = 0.742 ; median SIMBAD G7V d<25pc (N=4) (B-V)(G7V) = 0.737 (+-0.023 sem,+-0.040 stdev); 3 ARICNS G7V stars (G7V) = 0.73 ; Fitzgerald70 (G7V) = 0.728 ; 6 HIP d<75pc (+-0.015 sem, +-0.032 stdev) (B-V)(G7V) = 0.72 ; exemplar HD 131156 = Xi Boo A (B-V)(G7V) = 0.714 ; exemplar alf Men = HD 43834 ([Fe/H] ~ +0.1) (B-V)(G7V) = 0.713 ; interp G5V(B-V=0.68),G8V(B-V=0.73) (B-V)(G7V) = 0.71 ; KenyonHartmann95 (G7V) = 0.709 ; 33 Gray01/03/06 G7V (+-0.005 sem, +-0.030 stdev) (B-V)(G7V) = 0.705 ; median CATSUP d<30pc (N=8) (B-V)(G7V) = 0.703 ; exemplar HD 111395 (B-V)(G7V) = 0.684 ; exemplar HD 24206 => adopt (B-V)(G7V) = 0.710*** [last updated 8/29/2019] => adopt (U-B)(G7V) = 0.237 => adopt (V-I)(G7V) = 0.764 => adopt (V-R)(G7V) = 0.391 => adopt (R-I)(G7V) = 0.372 => adopt (V-J)(G7V) = 1.299 => adopt (V-H)(G7V) = 1.626 => adopt (H-Ks)(G7V) = 0.079 => adopt (J-H)(G7V) = 0.327 (V-Ks)(G7V) = 1.683 +- 0.043 ; B-V vs. V-Ks for XHIP d<50pc G dwarfs (-0.1<[Fe/H]<0.1) for B-V=0.710 (V-Ks)(G7V) = 1.705 ; MS trend for B-V=0.710 => adopt (V-Ks)(G7V) = 1.705 [updated 6/5/2021] Gray01/03/06 list 33 nearby G7V stars. Median HIP colors: (G7V) = 0.709 (+-0.005 sem, +-0.030 stdev; N=33) (G7V) = 0.758 (+-0.007 sem, +-0.026 stdev; N=33) For G7V Hipparcos stars within 75pc, with parallax S/N > 8, and within 1 mag of the MS (N=6): (G7V) = 0.728 (+-0.015 sem, +-0.032 stdev; N=6) (G7V) = 0.785 (+-0.009 sem, +-0.019 stdev; N=6) (G7V) = 1.354 (+-0.021 sem, +-0.044 stdev; N=6) (G7V) = 1.703 (+-0.022 sem, +-0.058 stdev; N=6) (G7V) = 1.808 (+-0.033 sem, +-0.069 stdev; N=6) (G7V) = 0.358 (+-0.008 sem, +-0.018 stdev; N=6) (G7V) = 0.087 (+-0.005 sem, +-0.013 stdev; N=6) (G7V) = 0.823 (+-0.018 sem, +-0.037 stdev; N=6) (G7V) =-0.088 (+-0.003 sem, +-0.009 stdev; N=6) (G7V) = 2.530 (+-0.046 sem, +-0.095 stdev; N=6) (U-B)(G7V) = 0.224 ; HIP d<75pc S/N>8 G7V N=8 (Mermilliod91 photometry) (Ks-W1)(G7V) = 0.064 ; EEM trend for d<30pc for B-V=0.710 => adopt (Ks-W1)(G7V) = 0.064 [updated 12/29/2019] (Bp-Rp)(G7V) = 0.8691 ; HD_24206 (Bp-Rp)(G7V) = 0.87 ; Bp-G=0.38, G-Rp=0.49 (Bp-Rp)(G7V) = 0.8719 ; HD_111395 (Bp-Rp)(G7V) = 0.884 ; color trend for B-V=0.71 (Bp-Rp)(G7V) = 0.8880 ; exemplar alf Men = HD 43834 ([Fe/H] ~ +0.1) [Gaia EDR3] (Bp-Rp)(G7V) = 0.9128 ; HD_131156 (Bp-Rp)(G7V) = 0.929 ; Evans18 trend for V-I= 0.764 => adopt (Bp-Rp)(G7V) = 0.87 [updated 11/22/2020] (Bp-G)(G7V) = 0.3559 ; exemplar alf Men = HD 43834 ([Fe/H] ~ +0.1) (Bp-G)(G7V) = 0.370 ; color trend for B-V=0.71 (Bp-G)(G7V) = 0.3739 ; HD_24206 (Bp-G)(G7V) = 0.38 ; Bp-Rp=0.87, G-Rp=0.49 (Bp-G)(G7V) = 0.3806 ; HD_111395 (Bp-G)(G7V) = 0.4547 ; HD_131156 => adopt (Bp-G)(G7V) = 0.38 [updated 11/22/2020] (G-Rp)(G7V) = 0.4581 ; HD_131156 (G-Rp)(G7V) = 0.49 ; Bp-Rp=0.87, Bp-G=0.38 (G-Rp)(G7V) = 0.4913 ; HD_111395 (G-Rp)(G7V) = 0.4953 ; HD_24206 (G-Rp)(G7V) = 0.515 ; color trend for B-V=0.71 (G-Rp)(G7V) = 0.5320 ; exemplar alf Men = HD 43834 ([Fe/H] ~ +0.1) => adopt (G-Rp)(G7V) = 0.49 [updated 11/22/2020] (G-V)(G7V) = -0.260 ; HD 105631 PM* G7V (G-V)(G7V) = -0.223 ; HD 122676 PM* G7V (G-V)(G7V) = -0.195 ; HD 61033 PM* G7V(e) (G-V)(G7V) = -0.194 ; HD 24206 PM* G7V (G-V)(G7V) = -0.194 ; G dwarf trend for G7V (G-V)(G7V) = -0.193 ; * alf Men G7V (G-V)(G7V) = -0.187 ; * ksi Boo G7Ve (G-V)(G7V) = -0.180 ; exemplar alf Men = HD 43834 ([Fe/H] ~ +0.1) [GaiaEDR3] (G-V)(G7V) = -0.180 ; HD 32778 PM* G7VFe-1.4CH-1.2 (G-V)(G7V) = -0.177 ; HD 128674 PM* G7V (G-V)(G7V) = -0.172 ; HD 24496 PM* G7V (G-V)(G7V) = -0.079 ; HD 28255B PM* G7V => adopt (G-V)(G7V) = -0.194 [updated 11/1/2020] (g-r)(G7V) = 0.519 ; Jordi06 (V-R)=>(g-r) for V-R=0.391 (g-r)(G7V) = 0.543 ; Covey07 interp G5V-G8V (g-r)(G7V) = 0.546 ; Bilir05 (B-V)=>(g-r) for B-V=0.710 => adopt (g-r)(G7V) = 0.54 [updated 10/10/2020] Teff(G7V) = 5432 K ; Boyajian12 Teff(G7V) = 5480 K ; GrayCorbally09 Teff(G7V) = 5509 K ; Napiwotzki93 Teff calibration for B-V=0.713 Teff(G7V) = 5523 K ; GrayCorbally94 interp. (G5V-G8V) Teff(G7V) = 5533 K ; median Teff for 86 published Teffs for G7V stars (EEM) Teff(G7V) = 5542 K ; Teff from smoothed SpT(Teff) trend Teff(G7V) = 5545 K ; Teff for d<30pc [Fe/H]=+-0.1 dex dwarfs from Hinkel17 for B-V=0.72 Teff(G7V) = 5548 K ; Teff(B-V=0.71) interp G5V-G8V Teff(G7V) = 5561 K ; Casagrande10 Teff calibration for B-V=0.713 Teff(G7V) = 5587 K ; exemplar HD 43834 = HR 2261 = alf Men ([Fe/H] ~ +0.1) Teff(G7V) = 5589 K ; Biazzo07 Teff calibration for B-V=0.713 Teff(G7V) = 5636 K ; exemplar HD 111395 (see below) Teff(G7V) = 5663 K ; exemplar HD 24206 (see below) => adopt Teff(G7V) = 5550 K (logT = 3.744) [updated 8/29/2019] BCv(G7V) = -0.132 mag ; EEM fit to Casagrande06/08/10 (Teff=5550K) BCv(G7V) = -0.132 mag ; Bertone04(Teff=5550K,ATLAS) BCv(G7V) = -0.130 mag ; Flower96(Teff=5550K) BCv(G7V) = -0.126 mag ; Masana06(Teff=5550K) BCv(G7V) = -0.121 mag ; Casagrande18(Teff=5550K,logg=4.5) BCv(G7V) = -0.120 mag ; Bessell98(ATLAS9,logg=4.5,Teff=5550K) => adopt BCv(G7V) = -0.125 mag [last updated 8/29/2019, on scale where BCv(5772K)=-0.085] Mv(G7V) = 5.58 mag ; exemplar HD 131156 = Xi Boo A Mv(G7V) = 5.5 mag ; GrayCorbally09 Mv(G7V) = 5.30 mag ; median SIMBAD G7V d<25pc (N=4) Mv(G7V) = 5.20 mag ; CATSUP -0.1<[Fe/H]<0.1 d<30pc for B-V=0.710 Mv(G7V) = 5.19 mag ; exemplar HD 24206 Mv(G7V) = 5.17 mag ; B-V=0.720 => EEM fit to SIMBAD dwarfs d<25pc Mv(G7V) = 5.16 mag ; B-V=0.720 => Mv(Wright05) Mv(G7V) = 5.15 mag ; Gray01/03/06 dwarfs, xHIP B-V/Mv, Gaspar16 |[Fe/H]|<0.05 "solar": fit for B-V=0.71 Mv(G7V) = 5.12 mag ; median XHIP G7V d<20pc Mv(G7V) = 5.15 mag ; exemplar HD 111395 Mv(G7V) = 5.03 mag ; exemplar HD 43834 = HR 2261 = alf Men Mv(G7V) = 4.83 mag ; Wegner07 => adopt Mv(G7V) = 5.20 mag [updated 9/26/2019] => adopt M_G(G7V) = 5.006 mag [updated 12/10/2020] (Mv=5.2, G-V=-0.194) => adopt M_Ks(G7V) = 3.495 mag [updated 12/30/2020] (Mv=5.2, V-Ks=1.705) logL(G7V) = -0.134 dex ; Mv=5.2, BCv=-0.125 => Mbol = 5.075 => adopt logL(G7V) = -0.134 dex [last updated 9/26/2019] => adopt Mbol(G7V) = 5.075 mag [last updated 9/26/2019] Rad(G7V) = 0.927 Rsun ; logL=-0.134, Teff=5550K => adopt Rad(G7V) = 0.927 Rsun [updated 9/26/2019] Mass(G7V) = 0.955 Msun ; EEM Mv vs. Mass fit for binaries (Mv=5.2) Mass(G7V) = 0.950 Msun ; Eker15 ML calibration for logL=-0.134 Mass(G7V) = 0.950 Msun ; Eker18 ML calibration for logL=-0.134 Mass(G7V) = 0.946 Msun ; EEM logL vs. Mass fit for binaries (logL=-0.134) => adopt Mass(G7V) = 0.95 Msun [updated 10/23/2019] # No Standards JM53, Wilson62, Morgan65, MK73, Houk75, KeenanMcNeil76, Keenan85, Corbally86, Keenan99, GrayNstars do not list a G7V standard. Skiff08 does not flag any stars as G7V MK standards. # Exemplar HD 111395 = HIP 62523 (J1248+2450): G5V: Cannon(G5),Harlan70,Schild73 G6V: Adams35 *G7V: Morgan53,Stebbins56,Jaschek64(all),Jaschek78(Morgan53),Kennedy83(all),Gray03 K1IV: Keenan40 Not considered a standard star in the literature, however it is at least pleasing that Morgan and Gray agree on the classification (even if the star was not listed amongst Keenan's compilations of standards). Morgan53 lists only one G7V star: HD 111395. V=6.29(HIP), Vmag=6.31(Johnson66), B-V=0.70(Johnson66), B-V=0.703+-0.002(HIP), U-B=0.25(Johnson66). PASTEL mean parameters: Teff=5636+-11K, [Fe/H]=0.104+-0.007, logg=4.54+-0.03. HD 24206 = HIP 18097 G5V: Adams35 *G7V: Gray03 G8V: 1927MeUpp..28....1L Picked this star as it is nearby (d<30pc) G7V (modern type by Gray) of solarish metallicity (closest to solar among CATSUP d<30pc stars). WDS lists it as a 0.1" binary of equal magnitude (OCC 838), but I see no evidence from published RV or astrometric data that this is a tight stellar binary, and absolute magnitude places it right on the main sequence? V=7.57(HIP), B-V=0.684+-0.002(HIP), V-I=0.74+-0.00(HIP), J = 6.320+-0.026(2MASS), H = 5.971+-0.018(2MASS), Ks=5.918+-0.021(2MASS), V-Ks = 1.652(HIP,2MASS), PASTEL: = 5663K(N=4), logg=4.50+-0.20(N=1;Mishenina04), [Fe/H]=-0.08+-0.10(N=1; Mishenina04). CATSUP lists [Fe/H] = -0.04+-0.04. plx = 33.4459+-0.0432(GaiaDR2) => Mv = 5.19+-0.01. HD 131156 = Xi Boo A = HR 5544 = GJ 566 (J1451+1906) G5: Adams35(G5V),Bidelman85 G6+V: Keenan41 *G7V: Levato78(G7Ve),Gray03 G8V: MK43(stan),JM53,Wilson62(stan,JM53),Houk,Abt81 K0V: Morgan38 B-V=0.733+-0.005 (CCDM Tycho=>Johnson photometry, EEM). As Gray's more recent classifications are more reliant on Keenan's 1980s-era standards, it appears that Gray03 considers Xi Boo A to be ~1 subtype earlier than 61 UMa. As 61 UMa is an anchor standard that has survived from MK1943 through Keenan's 1980s works, we keep 61 UMa as the primary G8V standard, and now consider Xi Boo A to be deprecated. PASTEL medians: =5500K(N=20), [Fe/H]=-0.15(N=18), =4.54(N=17). Ramirez13 provides accurate values with small uncertainties: Teff=5458+-73K, logg=4.54+-0.03, [Fe/H]=-0.15+-0.05. Binary with K5V companion B (sep~5"): Mermilliod91 lists V(A)=4.720+-0.000, B-V(A)=0.720+-0.000, V(B)=6.947+-0.029, B-V(B)=1.104+-0.083. GaiaDR2 lists parallaxes for A (148.5195+-0.2436mas) and B(148.2131+-0.0464mas). Mv(A)=5.58. HD 43834 = HR 2261 = alf Men = GJ 231 G5V: Evans57(Gliese91) G6V: Moore32(G6),Houk75,Hoffleit91 *G7V: Gray06 G9V: 1943HarCi.449....1H Well studied nearby asteroseismology target (Chontos20: https://arxiv.org/abs/2012.10797), and binary with M dwarf companion 3" away (mag1=5.09, mag2=10.1). Chontos20: M(A) = 0.964+-0.045 Msun, R(A)=0.960+-0.016Rsun, Teff=5569+-62K, age = 6.2+-1.4(stat)+-0.6(syst) Gyr, Activity cycle period 13.1+-1.1 yr. PASTEL: = 5587K(N=17), =4.47(N=15), <[Fe/H]> = +0.105(N=15). V=5.08(HIP), V=5.08+-0.01(Mermilliod91), B-V=0.714+-0.015(HIP), B-V=0.720+-0.000(Mermilliod91), V-I=0.75+-0.02(HIP), U-B=0.324+-0.008(Mermilliod91). Gaia EDR3: plx=97.9158+-0.0573mas. G(cor)=4.900(Vizier). Mv=5.034+-0.01(Mermilliod91,GaiaEDR3), M_G=4.854(GaiaEDR3,corr). G - V = 4.900 - 5.08 = -0.18. # Other Stars Morgan65 did not classify any Hyads as G7V. Skiff08 has HD stars with multiple G7V classifications: HD 107760, 111395, HD 131156A, 190067, 223498. HD 107760 = BD+74 493 G7V: Keenan53,Roman55 G3e+G9/K0e: Greenstein57 Spectroscopic binary G3e+G9/K0e (Greenstein57) with joint type G7V HD 131156 = Xi Boo A = HR 5544 = GJ 566 *G8V: MK43,Roman49,JM53,Wilson57,Jaschek64(all),Houk,Abt81 G7V: Gray03 G5: Cannon,Struve55(G5e) G8V standard HD 190067: G8V: Wilson62,Kennedy83(Harlan81) G7V: Adams35,Cowley67 K0V Fe-0.9: Gray03 HD 223498 G7V: Adams35,Roman55 G5V: Nassau47,Houk99 HD 201247B G7V: Gray06(G7V(k)), Torres06(G7V) F: Houk75 4" binary, primary is G5V. Teff: 5570+-80K(Casagrande11) - only one in PASTEL. HD 13531 = V451 And *G7V: Gray03 G0V: Montes01 G0: HD type Active star, Period = 7.52 day, logR'HK=-4.497 (Gray03). VSX reports amplitude of 0.03 mag. Montes01 considers part of Castor (group is likely unphysical). V=7.35(HIP), B-V=0.700+-0.015(HIP), V-I=0.75+-0.01(HIP), J=6.067+-0.019, H=5.749+-0.018(2MASS), Ks=5.665+-0.018(2MASS), V-Ks = 7.35 - 5.665 = 1.685. Teff = 5621+-44K(Marsden14)