GG1V Garrison94 does not list a G1V anchor standard, but MK73 lists HD 27836 as the G1V dagger standard. Keenan84 does not list G1 as a "full subtype" like G0 and G2, and that "The other possible subdivisions are utilized only for interpolation whenever we think we can classifier accurately enough to justify their use." JM53 standard: HD 115043 - G1V Wilson62 standard: HD 115043 - G1V (from JM53) MK73 dagger standard: HD 27836 - G1V MorganAbt73 standard: HD 27836 (= vB 50) & Bet CVn - G1V Houk75 standard: HD 27836 - G1V (primary standard) Keenan80 standard: HD 115043 - G1Va HD 89010 (=35 Leo) - G1IV-V Keenan83 standard: HD 115043 - G1Va [Ursa Major member] HD 89010 (=35 Leo) - G1IV-V 47 UMa (=HD 95128) - G1-V Fe-0.5 Keenan85 standard: zet^2 Ret (=HD 20807) - G1V Keenan88 standard: 39 Ser (=HD 142267) - G1V Fe-1 Gray89 standard: HD 27836 (= vB 50) - G1V Keenan89 standard: HD 10307 - G1V zet^2 Ret (=HD 20807) - G1V HD 115043 - G1Va 39 Ser (=HD 142267) - G1V Fe-1 47 UMa (=HD 95128) - G1-V Fe-0.5 HD 96700 (=HR 4328) - G1V Fe-0.5 Skiff08 lists five G1V (and variants) MK standards: HD 27836 (G1V; MK73), HD 10307 (G1V; Keenan89), HD 20807 (G1V; Keenan89), HD 115043 (G1Va;Keenan89), HD 142267 (Keenan89; G1V Fe-1). (B-V)(G1V) = 0.526 ; BakisEker22 (G1V) = 0.598 ; 144 HIP d<75pc (+-0.003 sem, +-0.029 stdev; N=144) but mostly Houk types (B-V)(G1V) = 0.60 ; KenyonHartmann95 (B-V)(G1V) = 0.600 ; ter. stan. zet2 Ret (B-V)(G1V) = 0.601 (+-0.010 sem, +-0.030 stdev) N=20 ARICNS G1V stars (B-V)(G1V) = 0.602 ; sec. stan. HD 115043 (B-V)(G1V) = 0.604 ; pri. stan. HD 27836 (metal-rich, active) (B-V)(G1V) = 0.604 ; median B-V for 5 Morgan65 G1V Hyads (metal-rich) (B-V)(G1V) = 0.605 ; Schmidt-Kaler82(halfway G0V-G2V) (G1V) = 0.61 ; Morgan71 (B-V)(G1V) = 0.61 ; MorganAbt73 (B-V)(G1V) = 0.614 ; median SIMBAD G1V d<25pc (N=17) (B-V)(G1V) = 0.617 ; exemplar HD 146362 (B-V)(G1V) = 0.62 ; median CATSUP d<30pc (N=20) (G1V) = 0.62 ; Fitzgerald70 (B-V)(G1V) = 0.622 ; Gray G1Vs in Gaspar13 [Fe/H] catalog, trend for [Fe/H]=0.00 (B-V)(G1V) = 0.625 ; halfway between G0V(0.600) & G2V(0.650) (G1V) = 0.627 ; 66 Gray01/03/06 (+-0.003 sem, +-0.019 stdev; N=66) => adopt (B-V)(G1V) = 0.622 *** [last updated 10/10/2020] => adopt (U-B)(G1V) = 0.092 => adopt (V-I)(G1V) = 0.690 => adopt (V-R)(G1V) = 0.350 => adopt (R-I)(G1V) = 0.340 => adopt (V-J)(G1V) = 1.152 => adopt (V-H)(G1V) = 1.430 => adopt (H-Ks)(G1V) = 0.069 => adopt (J-H)(G1V) = 0.277 (V-Ks)(G1V) = 1.485 (+-0.043) ; B-V vs. V-Ks for XHIP d<50pc G dwarfs (-0.1<[Fe/H]<0.1) for B-V=0.622 (V-Ks)(G1V) = 1.500 ; trend for B-V=0.622 (V-Ks)(G1V) = 1.537 (+-0.015sem, +-0.048sem) ; Kervella19 d<25pc G1V sample(N=10) => adopt (V-Ks)(G1V) = 1.500 [updated 10/10/2020] (G-V)(G1V) = -0.195 ; HD 159222 PM* G1V (G-V)(G1V) = -0.190 ; HD 45391 PM* G1V (G-V)(G1V) = -0.181 ; * zet02 Ret G1V (G-V)(G1V) = -0.178 ; HD 199509 PM* G1V (G-V)(G1V) = -0.174 ; HD 26491 PM* G1V (G-V)(G1V) = -0.159 ; trend for 121 G1Vs SIMBAD d<60pc interp for B-V=0.622 (G-V)(G1V) = -0.158 ; G dwarf trend for G1V (G-V)(G1V) = -0.158 ; HD 168009 PM* G1V (G-V)(G1V) = -0.155 ; HD 45270 PM* G1V (G-V)(G1V) = -0.149 ; HD 165185 PM* G1V (G-V)(G1V) = -0.145 ; median for Kervella19 d<25pc G1V sample (G-V)(G1V) = -0.145 ; HD 176377 PM* G1V (G-V)(G1V) = -0.138 ; HD 71148 PM* G1V (G-V)(G1V) = -0.133 ; from trend for B-V=0.625 => adopt (G-V)(G1V) = -0.158 [updated 11/1/2020] Gray01/03/06 list 66 nearby G1V stars. Median HIP colors: (G1V) = 0.627 (+-0.003 sem, +-0.019 stdev; N=66) (G1V) = 0.692 (+-0.001 sem, +-0.015 stdev; N=66) For G1V Hipparcos stars within 75pc, with parallax S/N > 8, and within 1 mag of the MS (N=144): (mostly Houk types) (G1V) = 0.598 (+-0.003 sem, +-0.029 stdev; N=144) (G1V) = 0.667 (+-0.004 sem, +-0.027 stdev; N=144) (G1V) = 1.103 (+-0.005 sem, +-0.059 stdev; N=144) (G1V) = 1.367 (+-0.007 sem, +-0.083 stdev; N=144) (G1V) = 1.446 (+-0.008 sem, +-0.088 stdev; N=144) (G1V) = 0.268 (+-0.003 sem, +-0.035 stdev; N=144) (G1V) = 0.079 (+-0.003 sem, +-0.027 stdev; N=144) (G1V) = 0.652 (+-0.004 sem, +-0.041 stdev; N=142) (G1V) =-0.068 (+-0.002 sem, +-0.014 stdev; N=142) (G1V) = 2.045 (+-0.011 sem, +-0.103 stdev; N=219) (Ks-W1)(G1V) = 0.060 ; EEM trend for d<30pc for B-V=0.625 => adopt (Ks-W1)(G1V) = 0.060 [updated 12/29/2019] (Bp-Rp)(G1V) = 0.7889 ; sig_CrB_B (Bp-Rp)(G1V) = 0.7895 ; HD_115043 (Bp-Rp)(G1V) = 0.7940 ; HD_27836 (Bp-Rp)(G1V) = 0.7947 ; HD_20807 (Bp-Rp)(G1V) = 0.795 ; Bp-G=0.345, G-Rp=0.45 (Bp-Rp)(G1V) = 0.800 ; color trend for B-V=0.622 (Bp-Rp)(G1V) = 0.8043 ; HD_11131 (Bp-Rp)(G1V) = 0.843 ; Evans18 trend for V-I=0.690 => adopt (Bp-Rp)(G1V) = 0.795 [updated 11/22/2020] (Bp-G)(G1V) = 0.3200 ; HD_27836 (Bp-G)(G1V) = 0.3375 ; sig_CrB_B (Bp-G)(G1V) = 0.3407 ; HD_115043 (Bp-G)(G1V) = 0.345 ; Bp-Rp=0.795, G-Rp=0.45 (Bp-G)(G1V) = 0.3460 ; HD_11131 (Bp-G)(G1V) = 0.354 ; color trend for B-V=0.622 (Bp-G)(G1V) = 0.3858 ; HD_20807 => adopt (Bp-G)(G1V) = 0.345 [updated 11/22/2020] (G-Rp)(G1V) = 0.4089 ; HD_20807 (G-Rp)(G1V) = 0.447 ; color trend for B-V=0.622 (G-Rp)(G1V) = 0.4488 ; HD_115043 (G-Rp)(G1V) = 0.45 ; Bp-Rp=0.795, Bp-G=0.345 (G-Rp)(G1V) = 0.4515 ; sig_CrB_B (G-Rp)(G1V) = 0.4583 ; HD_11131 (G-Rp)(G1V) = 0.4739 ; HD_27836 => adopt (G-Rp)(G1V) = 0.45 [updated 11/22/2020] (U-B)(G1V) = 0.082 ; HIP d<75pc S/N>8 G1V N=64 (Mermilliod91 photometry) (g-r)(G1V) = 0.454 ; Jordi06 (V-R)=>(g-r) for V-R=0.350 (g-r)(G1V) = 0.447 ; Bilir05 (B-V)=>(g-r) for B-V=0.622 (g-r)(G1V) = 0.415 ; Covey07 interp G0V-G2V => adopt (g-r)(G1V) = 0.45 [updated 10/10/2020] Teff(G1V) = 5717 +- 118 K ; vanBelle09 Teff(G1V) = 5785 K ; GrayCorbally94(halfway between G0V and G2V) Teff(G1V) = 5800 K ; GrayCorbally09 Teff(G1V) = 5836 K ; exemplar HD 146362 Teff(G1V) = 5841 K ; Teff for d<30pc [Fe/H]=+-0.1 dex dwarfs from Hinkel17 for B-V=0.625 Teff(G1V) = 5845 K ; Teff from smoothed SpT(Teff) trend Teff(G1V) = 5850 K ; sec. stan. HD 115043 (PASTEL median, see below) Teff(G1V) = 5850 K ; pri. stan. HD 27836 (Hyad, see below) Teff(G1V) = 5858 K ; ter. stan. zet2 Ret Teff(G1V) = 5860 K ; interp G0V(B-V=0.600,5930K)-G2V(B-V=0.650,5770K) Teff(G1V) = 5862 K ; mean photometric Teff Teff(G1V) = 5878 K ; Boyajian12 Teff(G1V) = 5902 K ; median of 645 published Teffs for G1V stars Teff(G1V) = 5945 K ; Schmidt-Kaler82(halfway G0V-G2V) => adopt Teff(G1V) = 5860 K (logT = 3.768) [updated 10/10/2020] BCv(G1V) = -0.075 mag ; Bessell98(ATLAS9,logg=4.5,Teff=5860K) BCv(G1V) = -0.073 mag ; Masana06(Teff=5860K) BCv(G1V) = -0.073 mag ; Code76(Teff=5860K) BCv(G1V) = -0.073 mag ; Casagrande18(Teff=5860K,logg=4.5) BCv(G1V) = -0.072 mag ; EEM fit to Casagrande06/08/10(Teff=5860K) BCv(G1V) = -0.070 mag ; Flower96(Teff=5860K) BCv(G1V) = -0.066 mag ; Bertone04(ATLAS,Teff=5860K) BCv(G1V) = -0.063 mag ; Balona94(Teff=5860K) BCv(G1V) = -0.060 mag ; Schmidt-Kaler82(halfway G0V-G2V BCv=-0.19 + 0.13 offset) => adopt BCv(G1V) = -0.073 [update 10/10/2020, on scale where BCv(5772K)=-0.085] Mv(G1V) = 4.84 mag ; ter. stan. HD 20807 Mv(G1V) = 4.77 mag ; sec. stan. HD 115043 Mv(G1V) = 4.72 mag ; V-Ks=1.50 for EEM poly fit to SIMBAD d<25pc (1/2022) (M_Ks=3.22) Mv(G1V) = 4.70 mag ; CATSUP -0.1 < [Fe/H] < 0.1 d<30pc for B-V=0.625 Mv(G1V) = 4.69 mag ; median SIMBAD G1V d<25pc (N=17) Mv(G1V) = 4.68 mag ; B-V=0.625 => EEM fit to SIMBAD dwarfs d<25pc Mv(G1V) = 4.63 mag ; linear fit to Gray01/03/06 dwarf sequence (d<50pc) for B-V=0.622 Mv(G1V) = 4.62 mag ; Gray01/03/06 dwarfs, xHIP B-V/Mv, Gaspar16 |[Fe/H]|<0.05 "solar": fit for B-V=0.622 Mv(G1V) = 4.61 mag ; B-V=0.622 => Mv(Wright05) Mv(G1V) = 4.55 mag ; Schmidt-Kaler82(halfway G0V-G2V) Mv(G1V) = 4.5 mag ; GrayCorbally09 Mv(G1V) = 4.36 mag ; median XHIP G1V d<20pc Mv(G1V) = 4.32 mag ; pri. stan. HD 27836 (Hyad) Mv(G1V) = 3.91 mag ; Wegner07 => adopt Mv(G1V) = 4.62 mag [updated 10/10/2020] => adopt M_G(G1V) = 4.462 mag [updated 12/10/2020] (Mv=4.62, G-V=-0.158) => adopt M_Ks(G1V) = 3.120 mag [updated 12/30/2020] (Mv=4.62, V-Ks=1.500) logL(G1V) = 0.077 dex ; Mv=4.62, BCv=-0.073 => Mbol = 4.547 => adopt logL(G1V) = 0.077 dex [last updated 10/10/2020] => adopt Mbol(G1V) = 4.547 mag [last updated 10/10/2020] Rad(G1V) = 1.060 Rsun ; Teff=5860K, logL=0.077 => adopt Rad(G1V) = 1.060 Rsun [updated 10/10/2020] Mass(G1V) = 1.20 Msun ; pri. stan. HD 27836 (Goldman13) Mass(G1V) = 1.047 Msun ; EEM logL vs. Mass fit for binaries (logL=0.077) Mass(G1V) = 1.046 Msun ; EEM Mv vs. Mass fit for binaries (Mv=4.62) Mass(G1V) = 1.034 Msun ; Ekers18 ML calibration for logL=0.077 => adopt Mass(G1V) = 1.04 Msun [updated 10/10/2020] # No standard Morgan65, Cowley76, KeenanMcNeil76, Keenan85, and Corbally86 do not list G1V standards. # Primary standard HD 27836 = HIP 20553 = Cl Melotte 25 50 (Hyad) G0V CaII(e): Gray01 *G1V: HoukStandard,MK73,MorganAbt73,Gray89(stan) Not the greatest standard as it is a tight binary and active star (Prot=7.168d, Vmax~7.56, Vmin~7.63; VSX) - would have preferred to see Keenan use it in later works, but I consider its use in MK73 to be sufficient. It is also a tight binary: 0.3", delta(V) = 3 mag. B-V(Merm91) = 0.604+-0.009. B-V(HIP)=0.604, Vmag=7.58, Mv=4.32, dMv=-0.18, par=22.3+-1.5 mas. so B-V is representative of the G1V class. Ks = 6.007 +- 0.009 (2MASS) V = 7.645 (HIP; CCDM split of V=7.58, delHp=3.021mag) (V-Ks) = 1.638 mag. Mass = 1.20 Msun (Goldman13). Teffs: 5731+-67K(Stevens17#2), 5750K(GaiaDR2#1), 5769+-57K(Kunder17), 5792+-16K(Stevens17), 5793+-93K(Casagrande11), 5906K(GaiaDR2#2), 5925+-54K(Cummings17), 6000K(Suchkov03), 6050+-224K(Bai19), 6120K(Gray01) => = 5850K. # Secondary Standards HD 115043 = GJ 503.2 = HIP 64532 = GJ 9434 (Ursa Major stream?) *G1V: JM53,Wilson62(stan,JM53),Barry70(G1Vb),Jaschek78,Keenan85(G1Va),Keenan89(G1Va) G1IV-V: Levato78 G2V: Roman49(G2Ve),Wilson50 Adopting G1Va from Keenan89. Jaschek64 split between G1V and G2V (7 vs. 7). Ks = 5.334+-0.009 (2MASS). (V-Ks) = 1.486 mag. B-V(HIP) = 0.602, Vmag=6.82, Mv=4.77, dMv=+0.28, par=38.9+-0.6 mas conclusion: decent standard?, migrated to G1V post-JM53, color match great. PASTEL mean parameters: Teff = 5850+-53K, [Fe/H] = -0.08+-0.03. # Tertiary standard: HD 20807 = zet^2 Ret = HR 1010 G0V: Gray06 *G1V: Evans57,Kennedy83,Keenan85,Gray89,Keenan89,Keenan99 G2V: Houk75 Would prefer to see better agreement between Keenan and recent Gray. Not surprised Houk75 type is a bit later given systematic trend in Michigan types vs. Keenan/Gray types. V=5.24(HIP), B-V=0.600+-0.009(HIP). PASTEL median values: = 5858K(N=24), [Fe/H]=-0.24. # Deprecated Standards HD 109358 = bet CVn = HR 4785 = GJ 475 *G0V: MKK43,JM53,Morgan65,MK73,Jaschek78,Keenan85,Keenan88,Garrison94,Gray01,Gray03,GrayNstars G1V: MorganAbt73 B-V(HIP)=0.588+-0.009, whereas B-V(G0V,HIP)=0.585 so its B-V color is very representative for its color. MorganAbt73 use Bet CVn as a G1V standard, but all other MK refs call it G0V. HD 10307 = HR 483 *G1V: Keenan89,Keenan99,Gray03,Barry70(G1Va) G1.5V: Keenan85,Garcia89(!),Hoffleit91 G2V: JM53,Jaschek64(all! N=24!),Jaschek78,Garcia89,Roman52 F8: Cannon18 Classification hasG migrated from G1V to G2V, but settled post-Keenan89. B-V(HIP) = 0.618+-0.001, B-V(HIP,G1V) = 0.602, Vmag(Merm91) = 4.958+-0.011. # Exemplars HD 146362 = sig CrB B G0: 1923LicOB..10..169L *G1V: Adams35,Slettebak63,Abt81,Bidelman85(G1),Gray03 Secondary 7" away from primary sig CrB A (HR 6063 = HD 146361), which itself appears to be a SB2/CAB of F8V stars (TZ CrB). B-V=0.617+-0.007(HIP), V=6.52(HIP), K=5.057+-0.020(2MASS), 2MASS J and H are corrupted. V-Ks = 6.52 - 5.057 = 1.463. PASTEL: = 5836K(N=2), logg=4.41(N=2), [Fe/H]=-0.08(N=2). HD 11131 = HIP 8486 *G1V: Adams35,Gray03(G1V(k)),Abt04 G3V: Houk99 # Variants HD 95128 = 47 UMa = HR 4277 G0V: MK43,Keenan88 *G1-V Fe-0.5: Keenan85,Keenan99 Keenan changed type. HD 142267 = 39 Ser = HR 5911 G0V Fe-0.5: Keenan85 *G1V Fe-1: Keenan88 # Other Stars Morgan65 classify 5 Hyads as G1V: HD 27836 (B-V=0.604), 27859 (B-V=0.599), 28344 (B-V=0.609), 28992 (B-V=0.631), & 29310 (B-V=0.597). Their median color is = 0.604. Gray03 and Gray06 only classify 5 stars are "pure" G1V stars (with no composition/activity flags): HD 38277 (only SpT in Skiff MK compilation 7/2015 is Gray06), HD 47283 (called G2/3V: by Houk82), HD 146070 (also called G1V by Houk82), HD 218251 (called G5V by Houk88), HD 222834 (6" binary, Houk calls F/G and F/G, a 1924 study calls G0). HD 146070 (only star both Gray03/06 and Houk agree on as G1V) G1V: Houk82,Gray06 B-V = 0.614+-0.010, V=7.53