FF7V Garrison94 does not list an F7V anchor standard, and MK73 does not list an MK73 dagger standard. None of the standards is particularly great, at least in terms of representing a near solar-metallicity F7V that is close to the color-mag main sequence. tet Per is worthy of some follow-up to see if it is truly halfway between F6V and F8V -- but its [Fe/H], Mv, and B-V are suggestive that it might be very representative of ~solar metallicity F7V stars (i.e. might be the best candidate standard of the bunch). iot Psc (= HD 222368) probably has the best pedigree of the F7V standards, however it appears to be slightly metal poor. JM53 standards: iot Psc - F7V tet Boo - F7V tet Per - F7V chi Dra - F7V Houk75 standard: iot Psc - F7V (primary standard) Cowley76 stardards: tet Boo - F7V HR 3794 - F7IV-V Houk/Michigan classifications: Houk's Michigan Spectral Survey catalogued 2370 stars as "F7V". Of these, 42 were later classified by Gray and collaborators (2001, 2003, 2006) with the median subtype being F8V (clipped mean F7.6 +-0.2 s.e.m., +-1.2 st.dev.). About a third of the Houk F8V stars were classified as stars of later hydrogen type with metal poor flags by Gray et al. (e.g. F8 through G0 with Fe and CH flags; the latest being "G0V Fe-0.8 CH-0.5"). I recommend grouping Houk's F7V stars with F7.5Vs classified since the 1970s (e.g. Gray's). Note that the median Teff of stars classified by Houk as F7V in the PASTEL compilation of Teffs (530 values) is 6208 K (+-168 K 1sigma scatter). For F7V Hipparcos stars within 75pc, with parallax S/N > 8, and within 1 mag of the MS (N=184): (F7V) = 0.989 (+-0.005 sem, +-0.053 stdev; N=184) (F7V) = 1.217 (+-0.006 sem, +-0.076 stdev; N=184) (F7V) = 1.290 (+-0.005 sem, +-0.083 stdev; N=184) (F7V) = 0.226 (+-0.003 sem, +-0.036 stdev; N=184) (F7V) = 0.072 (+-0.002 sem, +-0.026 stdev; N=184) (F7V) = 0.556 (+-0.003 sem, +-0.032 stdev; N=184) (F7V) =-0.060 (+-0.001 sem, +-0.010 stdev; N=184) (F7V) = 1.819 (+-0.010 sem, +-0.102 stdev; N=192) (B-V)(F7V) = 0.535 ; median CATSUP d<30pc (N=4; wide dispersion; 0.49-0.55) (F7V) = 0.527 (+-0.002 sem, +-0.025 stdev); HIP d<75pc S/N>8 (N=184) (B-V)(F7V) = 0.516 ; exemplar HD 142 = HR 6 ([Fe/H] ~ +0.113) (F7V) = 0.511 (+-0.003 sem, +-0.012 stdev); Gray01/03/06 (N=20) (B-V)(F7V) = 0.51 ; sec. stan. iot Psc (but [Fe/H] ~ -0.17) (B-V)(F7V) = 0.506 ; xHIP trend for F7V interp to [Fe/H] = 0.0 (B-V)(F7V) = 0.503 ; exemplar HD 8224 = HIP 6271 ([Fe/H] ~ -0.06) (B-V)(F7V) = 0.502 ; trend for standards & exemplars interpolated to [Fe/H] = 0.0) (B-V)(F7V) = 0.500 ; exemplar HD 14082 = HIP 10680 ([Fe/H] ~ +0.055) (B-V)(F7V) = 0.50 ; Fitzgerald70 (B-V)(F7V) = 0.50 ; Morgan71 (B-V)(F7V) = 0.50 ; KenyonHartmann95 (B-V)(F7V) = 0.50 ; JohnsonMorgan53 interp F6V(B-V=0.47),F8V(0.53) (B-V)(F7V) = 0.498 ; exemplar HD 27991 = 70 Tau ([Fe/H] ~ +0.1) (B-V)(F7V) = 0.495 ; exemplar HD 99453 = HIP 55779 ([Fe/H] ~ +0.07) (B-V)(F7V) = 0.492 ; exemplar HD 7345 = zet Psc B (B-V)(F7V) = 0.491 ; median SIMBAD F7V d<25pc (N=12) (B-V)(F7V) = 0.49 ; pri. stan. tet Boo ([Fe/H] ~ -0.006) (F7V) = 0.48 ; MorganAbt73/TableIII => adopt (B-V)(F7V) = 0.500 *** [updated 10/26/2020] => adopt (U-B)(F7V) = -0.016 => adopt (Bt-Vt)(F7V)= 0.522 => adopt (V-I)(F7V) = 0.569 => adopt (V-R)(F7V) = 0.284 => adopt (R-I)(F7V) = 0.284 => adopt (V-J)(F7V) = 0.955 => adopt (V-H)(F7V) = 1.162 => adopt (V-Ks)(F7V) = 1.221 => adopt (H-Ks)(F7V) = 0.059 => adopt (J-H)(F7V) = 0.208 (G-V)(F7V) = -0.18576 ; HD_202275_ F7V_ (G-V)(F7V) = -0.17527 ; HD_142_ F7V_ (G-V)(F7V) = -0.15322 ; HD_4813_ F7V_ (G-V)(F7V) = -0.143 ; trend for screened late F dwarfs for B-V=0.50 (see 10/24/2020 notes in F5V.txt) (G-V)(F7V) = -0.14213 ; HD_143333_ F7V_ (G-V)(F7V) = -0.14022 ; HD_23308_ F7V_ (G-V)(F7V) = -0.1384 ; HD_126660_ F7V (G-V)(F7V) = -0.138 ; HD_17207_ F7V_ (G-V)(F7V) = -0.133 ; initial coarse estimate (G-V)(F7V) = -0.12933 ; HD_16895_ F7V (G-V)(F7V) = -0.129 ; Gray01/03/06 F dwarf sequence for B-V=0.500 (G-V)(F7V) = -0.126 ; HD_169830_ F7V_ (G-V)(F7V) = -0.1219 ; HD_194012_ F7V_ (G-V)(F7V) = -0.12086 ; HD_27991_ F7V (G-V)(F7V) = -0.11854 ; HD_25457_ F7V_ (G-V)(F7V) = -0.11623 ; HD_21899_ F7V_ (G-V)(F7V) = -0.115 ; HD_99453_ F7V_ (G-V)(F7V) = -0.10769 ; HD_222368_ F7V (G-V)(F7V) = -0.05158 ; HD_139460_ F7V_ => adopt (G-V)(F7V) = -0.14 [updated 10/30/2020] (Bp-Rp)(F7V) = 0.6377 ; HD_99453 (Bp-Rp)(F7V) = 0.6408 ; HD_142 (Bp-Rp)(F7V) = 0.6523 ; zet_Psc_B (Bp-Rp)(F7V) = 0.6532 ; 70_Tau (Bp-Rp)(F7V) = 0.659 ; color trend for B-V=0.500 (Bp-Rp)(F7V) = 0.6657 ; HD_8224 (Bp-Rp)(F7V) = 0.6810 ; HD_14082 (Bp-Rp)(F7V) = 0.6884 ; tet_Per (Bp-Rp)(F7V) = 0.6938 ; iot_Psc (Bp-Rp)(F7V) = 0.701 ; Evans18 trend for V-I= 0.569 => adopt (Bp-Rp)(F7V) = 0.67 [updated 11/22/2020] (Bp-G)(F7V) = 0.2691 ; zet_Psc_B (Bp-G)(F7V) = 0.2728 ; 70_Tau (Bp-G)(F7V) = 0.2787 ; HD_8224 (Bp-G)(F7V) = 0.2912 ; HD_142 (Bp-G)(F7V) = 0.2914 ; HD_14082 (Bp-G)(F7V) = 0.295 ; color trend for B-V=0.500 (Bp-G)(F7V) = 0.2998 ; HD_99453 (Bp-G)(F7V) = 0.30 ; Bp-Rp=0.68, G-Rp=0.38 (Bp-G)(F7V) = 0.3581 ; iot_Psc (Bp-G)(F7V) = 0.3811 ; tet_Per => adopt (Bp-G)(F7V) = 0.30 [updated 11/22/2020] (G-Rp)(F7V) = 0.3072 ; tet_Per (G-Rp)(F7V) = 0.3356 ; iot_Psc (G-Rp)(F7V) = 0.3379 ; HD_99453 (G-Rp)(F7V) = 0.3497 ; HD_142 (G-Rp)(F7V) = 0.366 ; color trend for B-V=0.500 (G-Rp)(F7V) = 0.38 ; Bp-Rp=0.68, Bp-G=0.30 (G-Rp)(F7V) = 0.3805 ; 70_Tau (G-Rp)(F7V) = 0.3832 ; zet_Psc_B (G-Rp)(F7V) = 0.3869 ; HD_8224 (G-Rp)(F7V) = 0.3896 ; HD_14082 => adopt (G-Rp)(F7V) = 0.37 [updated 11/22/2020] (Ks-W1)(F7V) = 0.055 ; EEM trend for d<30pc for B-V=0.51 => adopt (Ks-W1)(F7V) = 0.055 [updated 12/29/2019] (U-B)(F7V) = 0.00 ; Fitzgerald70 (U-B)(F7V) = 0.000 ; HIP d<75pc S/N>8 F7V N=99 (Mermilliod91 photometry) (F7V) = 0.579 (+-0.004 sem, +-0.022 stdev); Gray01/03/06 (N=20) (F7V) = 0.600 (+-0.001 sem, +-0.024 stdev); HIP d<75pc S/N>8 (N=192) (g-r)(F7V) = 0.348 ; Jordi06 (V-R)=>(g-r) for V-R=0.284 (g-r)(F7V) = 0.32 ; Covey07 interp F6V-F8V (g-r)(F7V) = 0.310 ; Bilir05 (B-V)=>(g-r) for B-V=0.50 => adopt (g-r)(F7V) = 0.32 [updated 10/10/2020] Teff(F7V) = 6090 K ; exemplar HD 8224 = HIP 6271 (note: 3" binary) Teff(F7V) = 6185 K ; sec. stan. iot Psc (median Teff, slightly metal poor) Teff(F7V) = 6207 K ; mean photometric Teff Teff(F7V) = 6208 K ; median Teff for Houk F7V stars with PASTEL Teffs (but Houk F7V~Gray F7.5V) Teff(F7V) = 6211 K ; exemplar HD 14082 = HIP 10680 Teff(F7V) = 6250 K ; GrayCorbally09 Teff(F7V) = 6253 K ; Boyajian12 Teff(F7V) = 6270 K ; Gray03/06 F7Vs median from TIC9/Stassun19 (N=13) Teff(F7V) = 6276 K ; median of 945 published Teffs for F7V stars Teff(F7V) = 6276 K ; exemplar HD 142 = HR 6 Teff(F7V) = 6283 K ; Teff from smoothed SpT(Teff) trend Teff(F7V) = 6297 K ; pri. stan. tet Per (median Teff) Teff(F7V) = 6343 K ; exemplar HD 7345 = zet Psc B Teff(F7V) = 6360 K ; GrayCorbally94 Teff(F7V) = 6365 K ; exemplar HD 99453 = HIP 55779 Teff(F7V) = 6394 +- 104 K ; vanBelle09 Teff(F7V) = 6417 K ; candidate stan. 70 Tau (median Teff, slightly metal rich) => adopt Teff(F7V) = 6280 K (logT = 3.798) [updated 9/19/2020] BCv(F7V) = 0.018 mag ; Balona94(Teff=6280K) BCv(F7V) = 0.016 mag ; Bertone04(Teff=6280K) BCv(F7V) = -0.016 mag ; Flower96(Teff=6280K) BCv(F7V) = -0.030 mag ; Masana06(Teff=6280K) BCv(F7V) = -0.035 mag ; Casagrande18(Teff=6280K,logg=4.5) BCv(F7V) = -0.036 mag ; Bessell98(ATLAS9,logg=4.5,Teff=6280K) BCv(F7V) = -0.045 mag ; EEM fit to Casagrande06/08/10(Teff=6280K) BCv(F7V) = -0.043 mag ; Code76(Teff=6280K) => adopt BCv(F7V) = -0.035 [updated 9/19/2020; adjusted so that BCv(5772K)=-0.085] Mv(F7V) = 2.98 mag ; exemplar HD 99453 = HIP 55779 Mv(F7V) = 3.09 mag ; exemplar 70 Tau (Hyad) Mv(F7V) = 3.22 mag ; deprecated stan. HD 126660 = tet Boo Mv(F7V) = 3.22 mag ; exemplar HD 7345 = zet Psc B Mv(F7V) = 3.30 mag ; Wegner07 Mv(F7V) = 3.43 mag ; sec. stan. iot Psc Mv(F7V) = 3.61 mag ; median SIMBAD F7V d<25pc Mv(F7V) = 3.62 mag ; exemplar HD 142 = HR 6 Mv(F7V) = 3.72 mag ; F dwarf trend standards/exemplars Mv(F7V) = 3.73 mag ; exemplar HD 8224 = HIP 6271 Mv(F7V) = 3.8 mag ; GrayCorbally09 Mv(F7V) = 3.80 mag ; linear fit to Gray01/03/06 dwarf sequence (d<50pc) for B-V=0.50 Mv(F7V) = 3.81 mag ; Gray01/03/06 dwarfs, xHIP B-V/Mv, Gaspar16 |[Fe/H]|<0.05 "solar": fit for B-V=0.50 Mv(F7V) = 3.81 mag ; B-V=0.50 => Mv(Wright05) Mv(F7V) = 3.84 mag ; d<60pc SIMBAD F7V (N=138) Mv(F7V) = 3.87 mag ; pri. stan. tet Per ([Fe/H]> ~ -0.006) Mv(F7V) = 3.88 mag ; xHIP |[Fe/H]|<0.2 dex d<25pc dwarf only for B-V=0.50 Mv(F7V) = 3.89 mag ; B-V=0.50 => EEM fit to SIMBAD dwarfs d<25pc Mv(F7V) = 3.99 mag ; exemplar HD 14082 = HIP 10680 Mv(F7V) = 4.02 mag ; deprecated stan. HD 170153 = chi Dra (metal poor) => adopt Mv(F7V) = 3.80 mag [updated 10/30/2020] => adopt M_G(F7V) = 3.66 mag [updated 12/10/2020] (Mv=3.80, G-V=-0.14) => adopt M_Ks(F7V) = 2.579 mag [updated 12/30/2020] (Mv=3.80, V-Ks=1.221) logL(F7V) = 0.390 dex ; Mv=3.80, BCv=-0.035 => Mbol = 3.765 => adopt logL(F7V) = 0.390 dex [updated 10/30/2020] => adopt Mbol(F7V) = 3.765 mag [updated 10/30/2020] Rad(F7V) = 1.458 Rsun ; Gray03/06 F7Vs median from TIC9/Stassun19 (N=13) Rad(F7V) = 1.331 Rsun ; Stassun/TICv8 Rads for smoothed trend for Gray03/06 FVs (Teff=6250K) Rad(F7V) = 1.3235 Rsun ; loogL=0.390, Teff=6280K => adopt Rad(F7V) = 1.324 Rsun [updated 10/30/2020] Mass(F7V) = 1.281 Msun ; EEM Teff vs. Mass fit for binaries (Teff=6250K) Mass(F7V) = 1.268 Msun ; sec. stan. iot Psc (Boyajian12) Mass(F7V) = 1.256 Msun ; HenryMcCarthy93 calibration for Mv=3.85 Mass(F7V) = 1.214 Msun ; EEM logL vs. Mass fit for binaries (logL=0.370) Mass(F7V) = 1.211 Msun ; Ekers18 ML calibration for logL=0.370 Mass(F7V) = 1.188 Msun ; EEM Mv vs. Mass fit for binaries (Mv=3.85) Mass(F7V) = 1.15 Msun ; sec. stan. iot Psc (Ghezzi10) Mass(F7V) = 1.138 Msun ; pri. stan. tet Per (Boyajian12) Mass(F7V) = 1.029 Msun ; chi Dra A (but metal poor [Fe/H] ~ -0.6) => adopt Mass(F7V) = 1.21 Msun [updated 12/29/2019] # No standard Morgan65, MK73, MorganAbt73, Cowley74, MK78, Keenan85, Corbally86, Gray89, and GrayNstars do not list a F7V standard. MorganAbt73 lists F6V standard (B-V=0.46) and F8V standard (B-V=0.52), but no F7V standard. Skiff08 did not flag any stars as F7V MK standards. # Primary Standard HD 16895 = tet Per = 13 Per = HIP 12777 = HR 799 = GJ 107A F5: Ljunggren61 F6V: Roman50 *F7V: JM53,Cowley76,Gray01 F7.5V: Morgan38 F8V: Barry70(F8Vb),Abt81,Bidelman85(F8) The only decent F7V standard that is near the color-mag main sequence (tet Boo and iot Psc are >0.4 mag off). No Houk type. M1.5 companion at sep=20.5" with delta(V)=5.84 (mag1=4.16,mag2=10.00). Vmag=4.10(HIP), V=4.11(TYC), V=4.113(Hauck97), V=4.13(Johnson66) => adopt Hauck97. Surprisingly wide scatter in B-V values given quoted uncertainties: B-V=0.48(JohnsonMorgan53), B-V=0.485+-0.006(Mermilliod91), B-V=0.487(Neckel980), B-V=0.489+-0.014(Tycho-2=>Mamajek06), B-V=0.49(Johnson66,BSC/Hoffleit91), B-V=0.498+-0.002(Tycho-1=>Mamajek06), B-V=0.503+-0.002(TYC), B-V=0.507+-0.015(Tycho-2=>EEM unpublished locus), B-V=0.514+-0.002(HIP), B-V=0.516+-0.002(Tycho-1=>EEM unpub. locus). Adopt B-V=0.49. Mermilliod87 lists 9 published values all between 0.48 <= B-V <= 0.50. V-Rc=0.296(Just08), Rc-Ic=0.286(Just08), V-Ic=0.582(Just08), J=3.07(Johnson68), K=2.98(Johnson68), L=2.96(Johnson68), 2MASS photometry poor (quality DCD). V-K(Johnson) = 4.113 - 2.98 = 1.133 (note that Engelbracht07 estimated Ks(2MASS)-K(Johnson) = 0.004+-0.005, treats as zero). plx= 89.87+-0.22mas(HIP2). Schiavon07 lists [Fe/H]=-0.02 dex, Teff=6118K, logg=4.35 dex. Takeda07 lists T=6350K, logg=4.32 dex, [Fe/H] = 0.06. The PASTEL catalog lists several Teff, logg, [Fe/H] estimates: = 6297K (+-36K sem, +-145K rms), = 4.35 (+-0.04 sem, +-0.19 rms), <[Fe/H]> = -0.006 (+-0.017 sem, +-0.071 rms). So the gravity is very dwarf-like and its metallicity is apparently very solar-ish. It's color is very representative of the median B-V for F7V stars. This might be the F7V standard with the best pedigree (given the problems with the other ones). Mv=3.87(HIP,HIP2). Mass=1.138+-0.010Msun(Boyajian12), age=4.0+-0.4Gyr(Boyajian12). # Secondary Standards HD 222368 = iot Psc = 17 PSc = HIP 116771 *F7V: JM53,Jaschek64(majority),Jaschek78,Houk,Gray89,Gray01 F8V: Barry70(F8Va uv metals weak),Roman50,Kennedy83,Bidelman85(F8) Gray agreed twice with original JM53 classification. V=4.126+-0.007(Mermilliod91), V=4.13(Johnson66), V=4.13(HIP), V=4.14(TYC), B-V=0.506+-0.006(Mermilliod91), B-V=0.507+-0.006(HIP), B-V=0.51(Johnson66), B-V=0.511+-0.003(TYC) => adopt B-V=0.51. U-B=0.006+-0.014(Mermilliod91), U-B=0.01(Johnson66). Mv=3.43, dMv=-0.42, par=72.5+-1.1 mas. PASTEL compilation has many estimates of Teff, logg, metallicity: = 6185 K (+-23 K sem, +-97 K rms), = = 4.13 (+-0.04 sem, +-0.20 rms), <[Fe/H]> = -0.17 (+-0.02 sem, +-0.11 rms). So star is slightly metal poor and slightly lower surface gravity than typical dwarfs. Mass = 1.15+-0.1 Msun (Ghezzi10), Mass=1.268+-0.009Msun(Boyajian12), Age=3.4+-0.2Gyr(Boyajian12). # Exemplars HD 27991 = 70 Tau (Hyades member) *F7V: Morgan65,Cowley76,Gray01 F8V: Treanor60 G0V: Harlan74 Hyades member, so slightly metal rich. Has benefit that Morgan classified amongst other F-type stars (many of which are now considered standards). But, it is a 0.1" separation visual binary (HIP) with delta(Hp) ~ 0.74+-0.31, with 13.15 year orbit, apparently nearly equal mass (K1=12.37 km/s, K2=13.63 km/s; Pourbaix00). B-V=0.49(Johnson66), B-V=0.490+-0.000(Mermilliod91), B-V=0.498+-0.006(TYC), B-V=0.509+-0.005(HIP) => adopt B-V=0.498. U-B=0.012+-0.018(Mermilliod91), V=6.462(Mermilliod91), V=6.44(HIP). plx = 21.20+-0.92 mas (vanLeeuwen07). PASTEL catalog: = 6417 K (+-19 K sem, +-37 K rms), = 4.49 (+-0.01 sem, +- 0.01 rms), <[Fe/H]> = +0.07 (+-0.04 sem, +-0.05 rms). Metallicity estimates roughly consistent with Hyades metallicity [Fe/H] ~ +0.1. Mv = 3.09. HD 142 = HR 6 = HIP 522 *F7V: Houk78,Gray89,Gray06 F8: 1953AnHar.119....1H,Bidelman85 G1IV: Evans61 K5V companion 4" away. WDS notes: "HDO 180: A is a spectroscopic binary. Primary is planet host star, P=339d. B comp is LHS 1021. Pair bound. Photometry suggests companion K8.5-M1.5 with mass 0.59 ± 0.02 Msun." WDS delta(mag)=5.8 (mag2=11.5). V=5.70(HIP), V=5.71(TYC), B-V=0.515+-0.002(TYC), B-V=0.516+-0.007(Mermilliod91), B-V=0.519+-0.011(HIP) => adopt unresolved B-V=0.516. V(B)=10.63(TYC). PASTEL: = 6276K(N=18), =4.25(N=13), <[Fe/H]>=+0.113(N=14). plx = 38.1605+-0.0648mas(GaiaDR2). Mv=3.62(TYC,GaiaDR2). HD 7345 = zet Psc B = HR 362 = HIP 5743 = Revati B = WDS J01137+0735 F5/6V: 1962AnAp...25....1B *F7V: Slettebak63,Levato75,Cowley76,Abt95 F7/8V: 1958JO.....41..105B F8V: Harlan74 WDS: part of at least quadruple system. HD 7345 is B component. WDS reports companion C 2.0" (mag1=6.26, mag2=12.20). A (Aa+Ab) component is 23" away V=5.2 A7V star (HR 361, HD 7344, HIP 5737) which is SB (Aa+Ab). V=6.23(TYC), V=6.44(HIP), V=6.293+-0.025(Mermilliod91), B-V=0.491+-0.010(Mermilliod91), B-V=0.493+-0.008(TYC), B-V=0.492+-0.007(HIP), Teffs: 5663K(Boesgaard87), 6238K(Stassun19), 6330K(Marsakov95), 6343K(GaiaDR2), 6493K(Anders19), 6584K(Stevens17), 6848+-626K(Casagrande11) => = 6343K. plx = 24.2497+-0.0541mas(GaiaDR2). Mv=3.22(Mermilliod91,GaiaDR2). HD 8224 = HIP 6271 (A) = CCDM J01205-5720 A *F7V: Evans57,Houk75,Cowley80 All 3 references in Skiff compendium classify it as F7V. 3" binary (mag1=7.18, mag2=9.48; WDS), HIP lists delta(Hp)=2.304. V=7.14(Tycho), B-V=0.503+-0.006(Tycho) Teff: 5749+-548K(Casagrande11,Netopil17), 6017K(Stassun18), 6081K(Stevens17), 6100+-180K(Bai19), 6107K(Schofield19) => = 6090K (discounting the Casagrande11 value with large errors). plx = 20.8189 0.0266mas(GaiaDR2) => Mv=3.73. [Fe/H]=-0.06+-0.10(Casagrande11,Gaspar13). HD 14082 = HIP 10680 F5V: Harlan69 F6V: Joy49 *F7V: 1948IzKry...2..103A(F7),Abt85,Abt88,Pecaut13 G1V: 1957ArA.....2...55O 14" binary with AG+28_256 = HIP 10679 (G3V, V=7.75). V=6.99(HIP), V=7.020(Mermilliod91), V=7.028+-0.001(Hauck97), B-V=0.518+-0.021(HIP), B-V=0.500(Mermilliod91), V-I=0.59+-0.02(HIP). plx = 25.1344+-0.0389mas(GaiaDR2) => Mv = 3.99+-0.01. PASTEL: = 6211K(N=3), <[Fe/H]>=0.055(N=2), =4.375(N=2). HD 99453 = HIP 55779 F3V: Moore32 *F7V: Malaroda75,Houk75,Gray06 F8V: 1953AnHar.119....1H V=5.18(HIP), B-V=0.495+-0.007(HIP), V-I=0.55+-0.00(HIP). plx = 36.74+-0.20(HIP2), plx = 36.3405+-0.1296 (GaiaDR2) => Mv=2.982+-0.013. Teffs: 6324K(Ammler-vonEiff12), 6361K(Gray03), 6368+-80K(Casagrande11), 6368K(Netopil17) => = 6365K. [Fe/H]=+0.07+-0.06(Gaspar16). # Deprecated Standards HD 126660 = tet Boo = HIP 70497 = HR 5404 = GJ 549A *F7V: JM53,Barry70(uv metals vweak),Cowley76(stan),Gray01 F7II-III: Bouw81 (unlikely given its Mv) F6IV: MK43 F6V: Bouigue59 F5: Bidelman85 No Houk type. B-V(HIP)=0.497, Vmag=4.04, Mv=3.22, dMv=-0.57, par=68.6+-0.6 mas Probably OK standard if JM53, Gray, & Barry all agree its F7V. Surprisingly lack of Teff estimates, except Taylor05 => Teff=6238. HD 170153 = chi Dra = 44 Dra = HIP 89937 = HR 6927 = GJ 713 F7V: JM53,Cowley76,Cowley67 *F7V metal-weak: Gray01 F7V+K1V: WDS hF8gF6mF6: Jaschek89 F8Vb: Barry70 F6V: Roman50 ("lines strong"), MK43(!) This star appears to be inappropriate for use as a standard given the comments by Gray01, Jaschek89, and Roman50. Star is metal poor and a delta(V) ~ 2 spectroscopic binary. Original HIP data yielded: B-V(HIP)=0.489, Vmag=3.55, Mv=4.02, dMv=0.28(compared to Wright04 MS), par=124.1+-0.5 mas. plx=124.11+-0.87mas(HIP2). PASTEL medians: = 6123K(N=10), [Fe/H]=-0.64(N=9), logg=4.28. Ramirez12 lists the star as a thin disk star with age 7.71+1.06-0.57 Gyr, and Ramirez13 lists 6.93 (5.85-7.94;1sigma) Gyr. The star has relatively low velocity and Soubiran05 estimates P(thin)=93%, P(thick)=7%. A has mass 1.0290+-0.0260 Msun(Torres10). Binary: Tomkin87 estimates delta(V)=1.99, which when combined with the Mermilliod91 Vmag (3.571+-0.009) yields V(A)=3.732, V(B)=5.722. With HIP2 parallax => Mv(A)=4.20, Mv(B)=6.19. If on the MS, the Mv for B would suggest type ~K2V, and the mass of 0.75+-0.02 Msun suggests ~K3/K3.5V, although Torres10 lists K0V. Tomkin87 (1987AJ.....93.1236T) estimates K0V, and likely intermediate between G8V and K2V. B-V(AB)=0.489+-0.005(Mermilliod91), U-B(AB)=-0.058+-0.005(Mermilliod91). HD 82543 = HR 3794 F6IV-V: Cowley76(stan) F7IV-V: MorganAbt72(stan) F8II: Cowley73 F8IV: Harlan74,Cowley79(F8IV:) F5: Cannon K0III+A/F: Houk99 Houk99 notes "HR 3794; VISUAL DOUBLE p=153°d=0.1arcsec MAGS 7.0, 7.0; vSINi<15" Is the Houk99 type a typo? Cowley went from F8II (1973) -> F6IV-V (1976; standard!) -> F8IV: (1979). Not a useful standard at this time. # Other Stars Morgan65 classified 3 F7V Hyads: HD 27808, 27991, 28394. Might be worth looking at these a bit closer, as one or more might make for a better F7V standard than the stars previously mentioned. HD 27808: F7V according to Morgan65, but Morgan made it a F8V standard in MK78, and F8V according to Gray89 and Gray01. B-V=0.520+-0.007 (Mermilliod91). So no good as a potential F7V standard. HD 27991 = 70 Tau: F7V according to Morgan65, Cowley76, and Gray01, but G0V according to Harlan74. B-V=0.490+-0.000 (Mermilliod91). 0.1" separation visual binary with 13.15 year orbit, apparently nearly equal mass (K1=12.37 km/s, K2=13.63 km/s; Pourbaix00) HD 28394: F7V according to Morgan65, but F8V according to Gray01, and F6V according to Abt04. B-V=0.501+-0.001 (Mermilliod91). Too much variation in published types to be worthy of being considered a standard. Of the three F7V Hyads from Morgan65, HD 27991 would seem to have the best agreement among classifiers as an F7V, but it is a tight binary. HD 27808 can't be a F7V standard as it is a well-used F8V standard. ### xHIP trend [Fe/H] vs. B-V HIP SpT [Fe/H] eFe/H B-V eB-V ref(SpT) 3909 F7V -0.10 9.99 0.514 0.011 2003AJ....126.2048G 12530 F7V -0.15 9.99 0.511 0.007 2003AJ....126.2048G 12777 F7V 0.00 9.99 0.514 0.002 2001AJ....121.2148G 12843 F7V 0.02 0.02 0.481 0.012 2009ApJS..180..117A 18859 F7V 0.03 0.02 0.516 0.007 2003AJ....126.2048G 25110 F7V 0.08 0.02 0.506 0.002 2003AJ....126.2048G 32439 F7V -0.12 0.01 0.525 0.003 2009ApJS..180..117A 45038 F7V 0.01 0.03 0.489 0.007 1981ApJS...45..437A 46853 F7V -0.16 9.99 0.475 0.018 2009ApJS..180..117A 62512 F7V -0.20 0.08 0.467 0.017 1978PASP...90..429L 68030 F7V -0.38 0.01 0.518 0.004 1979PASP...91...83C 70497 F7V -0.02 9.99 0.497 0.005 2001AJ....121.2148G 76602 F7V -0.07 0.02 0.520 0.015 2003AJ....126.2048G 104858 F7V -0.04 0.08 0.529 0.015 2003AJ....126.2048G 116771 F7V -0.14 9.99 0.507 0.006 2001AJ....121.2148G for -0.15<[Fe/H]<0.08: B-V = 0.5060 - 0.07485*[Fe/H] (rms=0.0137) for -0.1<[Fe/H]<0.1: B-V = 0.5062 - 0.11639*[Fe/H] (rms=0.0152) For 7 standards and exemplars listed at the beginning of the file, the trend is: B-V = 0.5019 - 0.01193*[Fe/H] (rms = 0.0096)