M4.5V Kirkpatrick(in GrayCorbally09) lists Gl 83.1 as the primary M4.5V standard. This is somewhat surprising as Keenan88 and Keenan99 listed the star as M5-V, however Boeshaar, Kirkpatrick, Henry, Hawley, and Reid all agree on M4.5V classification. The two latest Keenan99 dwarf standards were Gl 83.1 (M5-V) and Gl 268 ("M4.5e V"). Kirkpatrick91 retains Gl 268 as a M4.5V, but considers a "J" (joint, i.e. unresolved binary) spectrum. Given the strong agreement in the literature, GJ 166C is probably the second best M4.5V standard. Note that the the radius discontinuity pointed out by Rabus19 starts to show itself around M4.5V. For Teff=3110K, the M_Ks vs. Rad trend of Rabus predicts R=0.194Rsun, whereas Mann15 fits a trend through this messy M3-M4 region and predicts R=0.218Rsun for [Fe/H]=0.0. I adopt the Mann15 trend for the HR diagram position. Boeshaar76 standard: GJ 268 - M4.5e (plate II standard) Boeshaar76 standard: GJ 83.1 - M4.5e (plate III standard) Boeshaar76 stan. GJ 83.1, 268, 166C, 234AB (according to Kirkpatrick91) KeenanMcNeil76 stan.: GJ 268 - M4.5eV Keenan80 standard: GJ 268 - M4.5eV Keenan83 standard: GJ 268 - M4.5eV Turnshek85 standard: GJ 268 - dM4.5e Keenan85 standard: GJ 268 - M4.5eV Keenan88 standard: GJ 268 - M4.5eV Keenan89 standard: GJ 268 - M4.5eV Kirkpatrick91 stans: GJ 268 - M4.5V (primary standard) GJ 83.1 - M4.5V (primary standard) GJ 166C - M4.5V (primary standard) GJ 234AB - M4.5V (primary standard) GJ 791.2 - M4.5V (secondary standard) GJ 669B - M4.5V (secondary standard) Kirkpatrick94 stans: GJ 83.1 - M4.5V GJ 166C - M4.5V Henry02 standards: GJ 54.1 - M4.5V GJ 83.1 - M4.5V GJ 1224 - M4.5V LHS 3376 - M4.5V GJ 1230B - M4.5V GJ 234AB - M4.5VJ GJ 268AB - M4.5VJ GJ 1230AC - M4.5VJ GJ 791.2AB - M4.5VJ GJ 831ABC - M4.5VJ GJ 896BD - M4.5VJ GrayAtlas standard: omi^2 Eri c (=GJ 166C) - M4.5Ve GrayNstars standard: omi^2 Eri c (=GJ 166C) - M4.5V RECONS list shows GJ 54.1 (J0112-1659) to be the nearest M4.5V star, followed by GJ 234AB (J0629-0248; M4.5VJ), GJ 83.1 (J0200+1303). (M4.5V) = 1.52 ; Fitzgerald70 (B-V)(M4.5V) = 1.60 ; non-stan. CM Dra (out of eclipse, [Fe/H] ~ -1) (B-V)(M4.5V) = 1.601 ; pri. stan. GJ 166C (Mann15) (B-V)(M4.5V) = 1.67 ; pri. stan. GJ 166C (Reid04) (B-V)(M4.5V) = 1.664 ; deprecated stan. GJ 831 (Landolt09) (B-V)(M4.5V) = 1.707 ; deprecated stan. GJ 268AB (M4.5V) = 1.74 ; Bessell79 (B-V)(M4.5V) = 1.804 ; sec. stan. GJ 83.1 (B-V)(M4.5V) = 1.811 ; ter. stan. GJ 54.1 (Koen10) => adopt (B-V)(M4.5V) = 1.69 [updated 7/5/2020] (U-B)(M4.5V) = 1.05 ; non.stan. CM Dra (metal poor) (U-B)(M4.5V) = 1.19 ; ter. stan. GJ 1230AC (U-B)(M4.5V) = 1.192+-0.058 ; deprecated stan. GJ 268B (U-B)(M4.5V) = 1.23 ; U-B vs. B-V trend for Landolt09 photometric stans for B-V=1.72 (U-B)(M4.5V) = 1.231+-0.0041 ; deprecated stan. GJ 831 (Landolt09) (U-B)(M4.5V) = 1.316+-0.0145 ; sec. stan. GJ 83.1 (U-B)(M4.5V) = 1.326+-0.048 ; ter. stan. GJ 54.1 => adopt (U-B)(M4.5V) = 1.23 (V-R)(M4.5V) = 1.298 ; deprecated stan. GJ831 (Landolt09) (V-I)(M4.5V) = 2.968 ; deprecated stan. GJ831 (Landolt09) (M4.5V) = 3.03 ; Bessell79 (V-I)(M4.5V) = 3.05 ; Hawley96 (M4.5V) = 1.77 ; Bessell79 (R-Ic)(M4.5V) = 1.669 ; deprecated stan. GJ831 (Landolt09) (G-J)(M4.5V) = 2.858 ; Bentley18/interp (G-Ks)(M4.5V) = 3.722 ; Bentley18/interp (Ks-W2)(M4.5V) = 0.346 ; Bentley18/interp (W1-W2)(M4.5V) = 0.176 ; Bentley18/interp (Ks-W1)(M4.5V) = 0.160 ; Best18 (Ks-W1)(M4.5V) = 0.170 ; Bentley18/interp (Ks-W1)(M4.5V) = 0.203 ; fit to Winters15 data for V-Ks=5.65 (Ks-W1)(M4.5V) = 0.204 ; Avenhaus12 for V-Ks=5.65 => adopt (Ks-W1)(M4.5V) = 0.20 [updated 12/29/2019] (M4.5V) = 4.81 (+-0.46 stdev) ; Lepine12 (V-Ks)(M4.5V) = 5.104 ; CM Dra (M4.5V+M4.5V EB, but [Fe/H] ~ -1) (V-Ks)(M4.5V) = 5.228 ; pri. stan. GJ 166C (V-K)(M4.5V) = 5.5 ; Hawley96 (V-Ks)(M4.5V) = 5.385 ; candidate stan. GJ 754 (V-Ks)(M4.5V) = 5.49 ; trend fit to Dahn17 for M4.5V (V-Ks)(M4.5V) = 5.512 ; ter. stan. LHS 3376 (V-Ks)(M4.5V) = 5.596 ; halfway between M4V(5.25) & M5V(5.942) (V-Ks)(M4.5V) = 5.622 ; ter. stan. GJ 273AB (V-Ks)(M4.5V) = 5.64 ; deprecated stan. GJ 831 (V-Ks)(M4.5V) = 5.643 ; deprecated stan. GJ 268AB (V-Ks)(M4.5V) = 5.650 ; sec. stan. GJ 83.1 (V-Ks)(M4.5V) = 5.653 ; ter. stan. GJ 1224 (V-Ks)(M4.5V) = 5.654 ; ter. stan. GJ 54.1 (V-Ks)(M4.5V) = 6.138 ; ter. stan. GJ 896BD => adopt (V-Ks)(M4.5V) = 5.65 *** [updated 3/8/2018; note there are 3 standards with V-K=5.65] => adopt (V-I)(M4.5V) = 3.079 => adopt (V-R)(M4.5V) = 1.348 => adopt (R-I)(M4.5V) = 1.731 => adopt (V-J)(M4.5V) = 4.785 => adopt (V-H)(M4.5V) = 5.349 => adopt (H-Ks)(M4.5V)= 0.301 => adopt (J-H)(M4.5V) = 0.564 => adopt (G-V)(M4.5V) = -1.586 (Bp-Rp)(M4V) = 2.96 ; M4V mean (Bp-Rp)(M4.5V) = 2.9916 ; GJ_166C pri. stan. (Bp-Rp)(M4.5V) = 3.0524 ; GJ_754 exemplar (Bp-Rp)(M4.5V) = 3.1002 ; GJ_234A deprecated stan. (Bp-Rp)(M4.5V) = 3.1044 ; GJ_268AB deprecated stan. (Bp-Rp)(M4.5V) = 3.1078 ; GJ_1230A ter. stan. (Bp-Rp)(M4.5V) = 3.1339 ; LHS_3376 ter. stan. (Bp-Rp)(M4.5V) = 3.158 ; median d<10pc SIMBAD (N=23) (Bp-Rp)(M4.5V) = 3.1720 ; GJ_896B ter. stan. (Bp-Rp)(M4.5V) = 3.1737 ; GJ_83.1 sec. stan. (Bp-Rp)(M4.5V) = 3.1806 ; GJ_791.2 ter. stan. (Bp-Rp)(M4.5V) = 3.2061 ; GJ_54.1 ter. stan. (Bp-Rp)(M4.5V) = 3.2220 ; GJ_1224 ter. stan. (Bp-Rp)(M5V) = 3.36 ; M5V mean => adopt (Bp-Rp)(M4.5V) = 3.16 [updated 11/18/2020] (G-Rp)(M4.5V) = 1.2415 ; GJ_166C pri. stan. (G-Rp)(M4.5V) = 1.2490 ; GJ_754 exemplar (G-Rp)(M4.5V) = 1.2620 ; GJ_83.1 sec. stan. (G-Rp)(M4.5V) = 1.2662 ; GJ_1230A ter. stan. (G-Rp)(M4.5V) = 1.2706 ; GJ_268AB deprecated stan. (G-Rp)(M4.5V) = 1.2769 ; GJ_896B ter. stan. (G-Rp)(M4.5V) = 1.2785 ; GJ_791.2 ter. stan. (G-Rp)(M4.5V) = 1.2793 ; GJ_54.1 ter. stan. (G-Rp)(M4.5V) = 1.2832 ; LHS_3376 ter. stan. (G-Rp)(M4.5V) = 1.285 ; color trend M0V-M9V (G-Rp)(M4.5V) = 1.294 ; median d<10pc SIMBAD (N=23) (G-Rp)(M4.5V) = 1.2977 ; GJ_1224 ter. stan. (G-Rp)(M4.5V) = 1.3049 ; GJ_234A deprecated stan. => adopt (G-Rp)(M4.5V) = 1.28 [updated 11/18/2020] (Bp-G)(M4.5V) = 1.7501 ; GJ_166C (Bp-G)(M4.5V) = 1.7953 ; GJ_234A deprecated stan. (Bp-G)(M4.5V) = 1.8034 ; GJ_754 (Bp-G)(M4.5V) = 1.8338 ; GJ_268AB deprecated stan. (Bp-G)(M4.5V) = 1.8415 ; GJ_1230A (Bp-G)(M4.5V) = 1.8507 ; LHS_3376 (Bp-G)(M4.5V) = 1.88 ; Gp-Rp=3.16, G-Rp=1.28 (Bp-G)(M4.5V) = 1.8951 ; GJ_896B (Bp-G)(M4.5V) = 1.9021 ; GJ_791.2 (Bp-G)(M4.5V) = 1.9118 ; GJ_83.1 (Bp-G)(M4.5V) = 1.9243 ; GJ_1224 (Bp-G)(M4.5V) = 1.9268 ; GJ_54.1 = YZ Cet ter. stan. => adopt (Bp-G)(M4.5V) = 1.88 [updated 11/18/2020; Bp-Gp=3.16, G-Rp=1.28] (G-V)(M4.5V) = -1.6635 ; GJ_791.2 (G-V)(M4.5V) = -1.6446 ; GJ_54.1 (G-V)(M4.5V) = -1.6269 ; GJ_83.1 (G-V)(M4.5V) = -1.602 ; GJ_1224 (G-V)(M4.5V) = -1.5638 ; GJ_268AB deprecated stan. (G-V)(M4.5V) = -1.5397 ; LHS_3376 (G-V)(M4.5V) = -1.5073 ; GJ_1230A (G-V)(M4.5V) = -1.4904 ; GJ_234A deprecated stan. (G-V)(M4.5V) = -1.4895 ; GJ_754 (G-V)(M4.5V) = -1.479 ; polynomial fit to SIMBAD d<25pc M dwarfs (G-V)(M4.5V) = -1.4094 ; GJ_166C => adopt (G-V)(M4.5V) = -1.54 [updated 11/1/2020; M_G=12.04, Mv=13.58] => adopt (G-Ks)(M4.5V) = 4.11 = 5.65 + -1.54 [updated 7/11/2020] Mv(M4.5V) = 12.49 ; deprecated stan. GJ 268AB Mv(M4.5V) = 12.70 ; pri. stan. GJ 166C Mv(M4.5V) = 13.20 ; Kirkpatrick94 Mv(M4.5V) = 13.37 ; ter. stan. GJ 791.2 Mv(M4.5V) = 13.478 ; Finch14 calibration for (V-Ks)=5.65 Mv(M4.5V) = 13.508 ; EEM fit to Reid CNS3 data for (V-Ks)=5.65 Mv(M4.5V) = 13.574 ; EEM fit to Winters+2015 data for (V-Ks)=5.65 Mv(M4.5V) = 13.58 ; M_Ks=7.93, V-Ks=5.65 Mv(M4.5V) = 13.661 ; Henry04 calibration for (V-Ks)=5.65 Mv(M4.5V) = 13.744 ; Johnson09 calibration for (V-Ks)=5.65 Mv(M4.5V) = 14.05 ; ter. stan. GJ 1224 Mv(M4.5V) = 14.15 ; ter. stan. LHS 3376 Mv(M4.5V) = 14.24 ; ter. stan. GJ 54.1 => adopt Mv(M4.5V) = 13.58 [updated 12/10/2020] => adopt M_G(M4.5V) = 12.04 [updated 12/10/2020] (Mv=13.58, G-V=-1.54) => adopt M_Ks(M4.5V) = 7.93 [updated 12/10/2020] (V-K=5.65, Mv=13.58) [EEM 12/10/2020: Mv covers huge range ~12.5-14.2; note the gap among the standards between Mv = 13.37 and 14.05?] M_G(M4.5V) = 11.0077 ; V* QY Aur M_G(M4.5V) = 11.1198 ; Wolf 922 M_G(M4.5V) = 11.2603 ; * omi02 Eri C pri. stan. M_G(M4.5V) = 11.5088 ; Ross 614 deprecated stan. M_G(M4.5V) = 11.562 ; d<10pc SIMBAD median M_G(M4.5V) = 11.8816 ; L 347-14 M_G(M4.5V) = 11.922 ; trend SIMBAD d<10pc sample M_G(M4.5V) = 12.04 ; Mv=13.58, G-V=-1.54 M_G(M4.5V) = 12.19 ; Ross 619 M_G(M4.5V) = 12.2562 ; L 788-34 M_G(M4.5V) = 12.4187 ; GJ 38.1 = V* TZ Ari sec. stan. M_G(M4.5V) = 12.581 ; GJ 54.1 = YZ Cet ter. stan. M_G(M4.5V) = 12.6533 ; L 230-188 M_G(M4.5V) = 12.8818 ; V* GL Vir Note: among d<10pc sample, M_G ranges from 9.55-9.6 (pre-MS stars AT Mic A, B & binary Ross 614) to 12.96 for G_184-19B M_Ks(M4.5V) = 7.657 ; deprecated stan. GJ 234A = Ross 614 A M_Ks(M4.5V) = 7.828 ; Finch14 calibration for (V-Ks)=5.65 M_Ks(M4.5V) = 7.858 ; EEM fit to Reid CNS3 data for (V-Ks)=5.65 M_Ks(M4.5V) = 7.924 ; EEM fit to Winters+2015 data for (V-Ks)=5.65 M_Ks(M4.5V) = 7.940 ; EEM calibration for (V-Ks)=5.65 M_Ks(M4.5V) = 8.011 ; Henry04 calibration for (V-Ks)=5.65 M_Ks(M4.5V) = 8.094 ; Johnson09 calibration for (V-Ks)=5.65 (g-r)(M4.5V) = 1.535 ; Covey07 interp M4V 1.48, M5V 1.59 (r-i)(M4.5V) = 1.706 (+-0.05 rms) ; West05 fit for (V-Ic)=3.079 (i-z)(M4.5V) = 0.953 ; poly fit to d<75pc M dwarfs in SIMBAD for G-Ks=4.11 => adopt (i-z)(M4.5V) = 0.95 [updated 12/27/2021] (z-J)(M4.5V) = 1.563 (+-0.053 rms) ; poly fit to d<50pc SIMBAD M dwarfs for G-Ks=4.11 => adopt (z-J)(M4.5V) = 1.56 [updated 12/27/2021] Teff(M4.5V) = 3000K ; Bessell79 (Blackbody Teffs from Veeder74) Teff(M4.5V) = 3070 K ; pri. stan. GJ 166C (median Teff) Teff(M4.5V) = 3085 K ; ter. stan. GJ 896BD (median Teff) Teff(M4.5V) = 3089 K ; ter. stan. GJ 54.1 (median Teff) Teff(M4.5V) = 3100 K ; sec. stan. GJ 83.1 (median Teff) Teff(M4.5V) = 3100 K ; ter. stan. GJ 1224 (median Teff) Teff(M4.5V) = 3100 K ; deprecated stan. GJ 831 (median Teff) Teff(M4.5V) = 3100 K ; Rajpurohit13(N=17) Teff(M4.5V) = 3100 K ; Cifuentes for CARMENES M4.5V Teff(M4.5V) = 3101 K ; Morrell19 for stars w/i +-0.05 mag of M_Ks=7.93 Teff(M4.5V) = 3110 K ; Rad=0.2177 Rsun for Mann15 calib. for [Fe/H]=0.0, M_Ks=7.93. Teff(M4.5V) = 3110 K ; ter. stan. LHS 3376 (median Teff) Teff(M4.5V) = 3119 +- 43 K ; Lepine12 Teff(M4.5V) = 3130 K ; empirical L-R relation, for logL=-2.400 Teff(M4.5V) = 3130 K ; ter. stan. GJ 791.2 (median Teff) Teff(M4.5V) = 3130 +- 70 K ; CM Dra A (eclipsing binary) Teff(M4.5V) = 3120 +- 70 K ; CM Dra B (eclipsing binary) Teff(M4.5V) = 3140 K ; deprecated stan. GJ 268 (median Teff) Teff(M4.5V) = 3236 K ; Rajpurohit18 (mean for 14 M4.5Vs) Teff(M4.5V) = 3240 K ; Passegger18 median Teff for CARMENES M4.5Vs(N=11) => adopt Teff(M4.5V) = 3110K (logT = 3.493) [updated 4/9/2020] BCv(M4.5V) = -2.82 ; deprecated stan. GJ 268 AB (Leggett96) BCv(M4.5V) = -2.835 ; Mann15(V-J=4.785) BCv(M4.5V) = -2.84 ; BC_Ks=2.81, V-Ks=5.65 => adopt BCv(M4.5V) = -2.84 [updated 11/3/2019] BC_K(M4.5V) = 2.80 ; sec. stan. GJ 268 AB (Leggett96) BC_K(M4.5V) = 2.808 ; Mann15(V-J=4.785) BC_K(M4.5V) = 2.809 ; Morrell19 trend for G-Ks=4.10 => adopt BC_Ks(M4.5V) = 2.81 [updated 11/3/2019] logL(M4.5V) = -2.00 ; sec. stan. GJ 268 AB (Leggett96) logL(M4.5V) = -2.291 ; deprecated stan. GJ 234A = Ross 614A logL(M4.5V) = -2.395 ; Morrell19 trend for logL for M_Ks=7.93 logL(M4.5V) = -2.400 ; M_Ks=7.93, BC_Ks=2.81 => Mbol = 10.740 logL(M4.5V) = -2.400 ; Mv=13.58, BCv=-2.84 => Mbol=10.740 => adopt logL(M4.5V) = -2.400 [updated 11/15/2021] => adopt Mbol(M4.5V) = 10.740 [updated 11/15/2021] Rad(M4.5V) = 0.2177 Rsun ; Mann15 trend M_Ks=7.93, [Fe/H]=0.0 Rad(M4.5V) = 0.2173 Rsun ; logL=-2.400, Teff=3110K Rad(M4.5V) = 0.1939 Rsun ; Rabus19 trend for Teff=3110K Rad(M4.5V) = 0.187+-0.010 Rsun ; sec. stan. GJ 83.1 = GJ 9066 (Yee17) Rad(M4.5V) = 0.168+-0.009 Rsun ; ter. stan. GJ 54.1 = LHS 138 (Yee17) => adopt Rad(M4.5V) = 0.217 Rsun [updated 11/15/2021] Mass(M4.5V) = 0.166 Msun ; Benedict16 calibration for Mv=13.58 Mass(M4.5V) = 0.181 Msun ; Benedict16 calibration for M_Ks=7.93 Mass(M4.5V) = 0.1843 Msun ; Mann18 calib. for M_Ks=7.93 Mass(M4.5V) = 0.286 Msun ; GJ 791.2 tert. stan. (dynamical) => adopt Mass(M4.5V) = 0.184 Msun [updated 11/15/2021] # No Standard Boeshaar85 does not list an M4.5V standard # Primary Standard GJ 166C = Omi^2 Eri C = LHS 25 = LFT 340 = LTT 1909 = HD 26976 ? *M4.5Ve: Boeshaar76,Kirkpatrick91(pri),Kirkpatrick94,Hawley97,GrayAtlas,Reid04,Alonso-Floriano15 M4.7: Mann15 M5e: Luyten59, M5V: Newton14. 3"-8" binary with DA white dwarf, 77" from G9V star "A". Slightly metal-poor. B-V=1.67(Reid04), B-V=1.601(Mann15), B=12.831+-0.021(Mann15), V=11.17(Rojas-Ayala12, Wright11), V=11.19(Leinert97), V=11.23+-0.016(Mann15), V-K=5.21(Wright11), J=6.747+-0.020(2M), H=6.278+-0.040(2M), Ks=5.962+-0.026(2M). V-Ks = 11.19-5.962 = 5.228(Leinert97,2MASS). WD companion 8" away has J=9.8, blue near-IR colors. Teff = 2979+-32K(Rojas-Ayala13), 3070+-50K(Houdebine02), 3167+-60K(Mann15) => median Teff = 3070K. [Fe/H]=-0.21+-0.08(Mann15), [Fe/H]=-0.15(Rojas-Ayala13). plx = 198+-8 mas (Reid04), plx = 198.24+-2.0 mas, plx(A=HIP 19849) = 200.62+-0.23mas(HIP2), Mv=12.70 (Leinert V, HIP2 plx). GaiaDR2: plx=199.4552+-0.3204 mas, G=9.7606+-0.0013, E(BR/RP), Bp-Rp=2.9916, Bp-G=1.7501, G-Rp=1.2415. M_G=11.260+-0.004. # Secondary Standard GJ 83.1 = GJ 9066 = Woolley 9066 = LHS 11 = TZ Ari = G 3-33 = G 73-12 = L 1159-16 *M4.5V: Boeshaar76(stan),Kirkpatrick91(pri),Kirkpatrick94,Hawley97,Henry02,Reid04 M4.9: Mann15 M5-V: Keenan99,Keenan88,KeenanMcNeil76(stan; "on plate 18"),Pecaut13 M5V: KeenanMcNeil76(stan; "in Table 3"), Lepine13 This was the M5V and/or M5-V standard in KeenanMcNeil76 (there is a difference between the value listed on plate 18 vs. Table 3), however Keenan88 and Keenan99 simply listed it as M5- (=M4.75). V = 12.298+-0.0030(Landolt92), B-V=1.804+-0.0096(Landolt92), U-B = 1.316+-0.0145(Landolt92), V-R=1.355+-0.0039(Landolt92), R-I=1.751+-0.0045(Landolt92), V-I=3.099+-0.0048(Landolt92), J=7.514+-0.017(2M), H=6.970+-0.027(2M), Ks=6.648+-0.017(2M). V-Ks=5.650(Landolt,2M). We used this as M5-V in PecautMamajek13, however in hindsight it appears that M4.5V would have been a better choice given its recent use since Kirkpatrick91 (although the difference is only 0.25 type). Teffs: 2967+-50K(Houdebine12), 2997+-105K(Newton15), 3074+-60K(Gaidos14), 3080+-60K(Mann15#1), 3089K(Stelzer13), 3102K(Wright11), 3130K(Lepine13), 3165+-31K(Mann15#2), 3268K(Terrien15#1), 3276K(Terrien15#2) => median Teff ~ 3100K. Rad=0.187+-0.010Rsun(Yee17). GaiaDR2: plx=223.6349+-0.1066, G=10.6711+-0.0009, E(BR/RP)=1.488, Bp-Rp=3.1737, Bp-G=1.9118, G-Rp=1.2620. M_G=12.419+-0.001. # Tertiary Standards GJ 54.1 = LHS 138 = YZ Cet M4Ve: Torres06,Dieterich12(M4.0V) *M4.5V: Bidelman85(M4.5),Kirkpatrick94,Henry94,Hawley97,Henry02,Riaz06 M4.9: Mann15 M5Ve: Walker83, Lepine13("m5") M5.5Ve: Joy74 Knocked to tertiary since its status as a standard appears to start with Henry94. DwarfArchive cites M4.5V from Henry94. V=12.055+-0.018(Mermilliod91), V=12.074(Koen10), V=12.15(Winters15), B-V=1.841+-0.019(Mermilliod91), B-V=1.811(Koen10), U-B=1.326+-0.048(Mermilliod91), R=10.72(Winters15), I=8.94(Winters15), J=7.258+-0.020(2M), H=6.749+0.033(2M), Ks=6.420+-0.017(2M). V-Ks=12.074-6.420=5.654(Koen10,2M). Teffs: 3007+-50K(Houdebine12), 3056+-60K(Mann15#1), 3062+-62K(Gaidos14), 3089K(Stelzer13), 3100K(Rajpurohit13), 3132+-31K(Mann15#2), 3200K(Rajpurohit18) => median Teff= 3089K. plx=271.01+-8.36(Houdebine12), Mv=14.24(Koen10,Houdebine12). plx=269.3628+-0.0785mas, G=10.4294+-0.0006, E(BR/RP)=1.508, Bp-Rp=3.2061, Bp-G=1.9268, G-Rp=1.2793. M_G=12.581+-0.001. GJ 1224 = LHS 3359 = G 154-44 *M4.5V: Henry94,Hawley97,Henry02,Reid04 M4.0V: Dieterich12,Newton14(near-IR),Reidel14(M4.0Ve) V=13.48(Winters15,Hosey15), R=12.08(Winters15,Hosey15), I=10.31(Winters15,Hosey15), J=8.639+-0.024(2M), H=8.085+-0.044(2M), Ks=7.827+-0.027(2M). V-Ks=13.48-7.827=5.653(Winters15,2M). Teffs: 2711K(Jenkins09), 3089K(Stelzer13), 3104K(Gaidos14), 3245+-31K(Rojas-Ayala12) => adopt median Teff = 3100K. plx=130.0+-3.7mas. [M/H]=-0.03+-0.12(Rojas-Ayala12), [Fe/H]=-0.05+-0.17(Rojas-Ayala12). Mv=14.05. LHS 3376 = G 258-33 = 2MASS J18185725+6611332 *M4.5V: Henry94,Hawley97,Henry02,Kirkpatrick12(cites Henry94) M4: Gaido14 M5V: Newton14(near-IR) V=13.460(Mermilliod91), V=13.443+-0.051(APASS,Henden16), V=13.48(Gliese91), B-V=1.830(Mermilliod91,Gliese91), J=8.740+-0.021(2M), H=8.264+-0.049(2M), Ks=7.948+-0.018(2M), V-Ks=13.460-7.948=5.512(Mermilliod91,2M). Teffs: 2922K(Jenkins09), 3012+-45K(Rojas-Ayala12), 3053K(Wright11), 3089K(Stelzer13), 3130K(Lepin13), 3165+-60K(Gaidos14), 3288K(Terrien15#1), 3279K(Terrien15#2), 5306K(Bermejo13, obviously completely and utterly wrong) => median Teff = 3110K. [Fe/H]=-0.12+-0.17(Rojas-Ayala12), [M/H]=-0.08+-0.12(Rojas-Ayala12). plx=137.3+-5.3mas(Gliese91). Mv=14.15(Mermilliod91,Gliese91). GJ 896BD = EQ Peg B = LHS 3966 = 2MASS J23315244+1956138 *M4.5V: Bidelman85(M4.5),Henry94(M4.5VJ),Hawley97,Henry02(M4.5VJ),Tamazian06 M4.9: Mann15 M4+e: Boeshaar76(stan) M5Ve: Joy74 dM6e: Gliese91 GJ 896 is a quadruple system. AC is V=10.38 M3.5V, while BD is V=12.40 M4.5V (Henry02, magnitudes from Gliese91). Hp=12.395+-0.091(HIP). Hipparcos split AC and BD at 5.03". V(A)=10.30(Davison15), V(B)=12.40(Davison15), J=7.101+-0.081(2M), H=6.555+-0.049(2M),Ks=6.262+-0.042(2M). V-Ks=12.40-6.262=6.138, substantially redder than other standards. Teffs: 2950K(Cenarro01, Sanchez-Blazquez06,Cenarro07), 2980K(Lepine13; appears to have Teffs for A and B reversed), 3072+-60K(Mann15), 3080K(Morales08), 3089K(Stelzer13), 3200K(Prugneil11), 3328K(Wright11), 3375+-64K(Gaidos14) => median Teff = 3085K. Montes01 considers EQ Peg to be a member of the Castor Moving Group, however the group is demonstrably unphysical, at least as defined in the literature over the past two decades (Mamajek13). GJ 791.2 = HU Del = LHS 3556 *M4.5V: Kirkpatrick91(sec,M4.5VJ),Hawley97,Henry02(M4.5VJ) M4Ve: Eggen65 M7Ve: Cowley82 Binary has dynamical mass from Benedict00: M(A)=0.2866+-0.0061, M(B)=0.1258+-0.0029. plx=113.1+-0.3 mas(Benedict00). delta(V)=3.27+-0.10(Benedict00). V=13.06+-0.03(Leggett92), B-V=1.66+-0.05(Leggett92). Mv(A)=13.37+-0.03(Benedict00), Mv(B)=16.64+-0.10(Benedict00). Teff: 2896K(Jenkins09), 2980K(Lepine13), 3089K(Stelzer13), 3128+-67K(Gaidos14), 3243K(Terrien15#1), 3264K(Wright11), 3276K(Terrien15#2) => median Teff=3130K. GJ 1230AC = LDS 6330A = LSPM J1841+2447S *M4.5V: Henry94(M4.5VJ),Hawley97,Henry02(M4.5VJ) M4.3: Mann15 M5V: Newton14(near-IR) see GJ 1230 B notes. Teffs: 3089K(Stelzer13), 3170K(Terrien15#1), 3186+-69K(Gaidos14), 3214+-87K(Newton14), 3232+-60K(Mann15#1), 3279K(Terrien15#3), 3365+-61K(Mann15#2), 3370K(Terrien15#2) => median Teff ~ 3220K. V=12.40(Gliese91), V=12.52(Lepine05), B-V(ABC)=1.71(Gliese91), U-B(ABC)=1.19(Gliese91). # Exemplar GJ 754 = LHS 60 = L 347-14 *M4.5V: Walker83, Bidelman85(M4.5), Hawley97 All 3 published spectral types agree on M4.5V. V=12.230(Mermilliod91), B-V=1.700(Mermilliod91), U-B=1.220(Mermilliod91), J=7.661+-0.019(2MASS), H=7.130+-0.024(2MASS), Ks=6.845+-0.026(2MASS). V-Ks = 12.23 - 6.845 = 5.385. plx=169.03+-1.55mas(Jao05), plx=169.17+-1.53mas(Winters15,N=2), plx=169.00+-1.60mas(Weinberger16). # Deprecated Standards GJ 268AB = Ross 986 AB = G 87-26 AB = G 107-51 = LHS 226 = HIP 34603 = QY Aur *M4.5V: Boeshaar76(stan),KeenanMcNeil76(stan),Turnshek85(stan,dM4.5e),Keenan85(M4.5eV),Keenan89(M4.5eV), Kirkpatrick91(pri,M4.5VJ),Henry02(M4.5VJ) M4.5V+M4.5V: Reid04 2nd latest Keenan99 dwarf standard, but it is an "J" binary type in the Kirkpatrick/Henry papers, and Reid04 calls both components M4.5V. The only reason I don't list it as a primary standard is due to its joint type, but Reid04 says that both components are M4.5V. V(AB)=11.65(HIP), B-V=1.700+-0.510(HIP), V-I=3.40+-0.98(HIP). plx=158.87+-3.35mas(vanLeeuwen07). U=14.44(Morel78), U-B=1.192+-0.058(Mermilliod91), B=13.19(Morel78), B=13.263+-0.06(UCAC4), B-V=1.707+-0.005(Mermilliod91), V=11.49(Morel78), V=11.489+-0.020(Mermilliod91), V=11.519+-0.03(UCAC4), J=6.731+-0.026, H=6.152+-0.047, Ks=5.846+-0.018. V-Ks=5.643(Mermilliod91,2MASS). Mv=12.49(Mermilliod,HIP2). In SDSS DR8. Leggett96 derives: flux = 8.69e-12 W/m^2, logL=-2.00, mbol=8.67, Mbol=9.76, BCv=-2.82, BC_K=2.80. GJ 234AB = Ross 614 AB = LHS 1849 + LHS 1850 = HIP 30920 = 2MASS J06292339-0248499 *M4.5V: Joy74(M4.5Ve),Bidelman85,Kirkpatrick91(sec),Kirkpatrick94,Henry94(M4.5VJ),Hawley97,Henry02(M4.5VJ),Reid04 M5: RoyasAyala12(K-band) M4V+M5.5V: WDS 1.3" binary at 4.12 pc. For recent summaries on the binary see Gatewood03 and Kervella19. Gatewood03: Period=16.595+-0.0076yr, plx=244.07+-0.73mas, M(A)=0.2228+-0.0055Msun, M(B)=0.1107+-0.0028Msun, semi-major axis a=1101.2+-8.2mas => a=4.53+-0.03au, and finds recent Gaia astrometry is in good agreement with Gatewood's values. del(V)=3.08+-0.05 (Henry96 in Gatewood03). del(647nm) ~ 2.87+-0.06(Gatewood03), adopt as del(R). del(K)=1.50(Coppenbarger94 in Gatewood03). WDS reports sep=0.6" in 2015. Kirkpatrick94 calls B "M4.5-6.5V", Reid04 calls B M5.5V. Kirkpatrick94 estimates V=11.08 joint, and individual absolute magnitudes for the components Mv(A)=13.05, Mv(B)=16.33, i.e. delta(V)=3.28, so V(A)~11.13, V(B)~14.41. Gatewood03: Mv(A)=13.09+-0.04, Mv(B)=16.17+-0.06. V(AB)=11.108+-0.021(Mermilliod91), V(AB)=11.12(HIP), J(AB)=6.376+-0.023(2MASS), J(AB)=5.754+-0.034(2MASS), Ks(AB)=5.486+-0.016(2MASS). V-Ks = 11.108 - 5.486 = 5.622 (combined). Split magnitudes: V(AB)=11.108+-0.021, del(V)=3.08+-0.05 => V(A)=11.170+-0.021, V(B)=14.250+-0.054 => plx=242.9659+-0.8833mas(GaiaDR2) => Mv(A) = 13.098+-0.022, Mv(B) = 16.178+-0.055. Reid04: V(A)=11.08, V-Rc(A)=1.30(Reid04) => Rc(A) = 9.78. Split Ks mag: Ks(AB)=5.486, del(K)=1.50 => Ks(A)=5.729, Ks(B)=7.229 => M_Ks(A) = 7.657, M_Ks(B) = 9.157. Luminosity: M_Ks(A) = 7.657, adopt BC_Ks=2.81 for M4.5V => Mbol=10.467, logL=-2.291. GJ 831 = HIP 106255 = LHS 511 = G026-007 = Wolf 922 = BB Cap *M4.5V: Walker83,Henry94,Hawley97,Henry02 M5Ve: Joy74 M4: Bidelman85,Dieterich12(M4.0VJ) Unresolved triple? AB separation 0.2" in 2007 (WDS, V(B)=14.90). V=11.96(HIP), V=11.928(Hauck90), V=11.928+-0.013(Mermilliod91), V=12.005+-0.0057(Landolt92), V=12.006+-0.0017(Landolt09), B-V=1.670+-0.017(Mermilliod91), B-V=1.703+-0.046(HIP), B-V=1.669+-0.0037(Landolt92), B-V=1.664+-0.0006(Landolt09), U-B=1.185(Mermilliod91), U-B=1.235+-0.0204(Landolt92), U-B=1.231+-0.0041(Landolt09), V-R=1.300+-0.0053(Landolt92), V-R=1.298+-0.0011(Landolt09), R-I=1.695+-0.0049(Landolt92), R-I=1.669+-0.0009(Landolt09), V-I=2.986+-0.0073(Landolt92), V-I=2.968+-0.0015(Landolt09), J=7.316+-0.023(2M), H=6.701+-0.034(2M), Ks=6.379+-0.020(2M). V-K=5.64(Hosey15). plx=120.52+-5.98mas(vanLeeuwen07). Teffs: 3029K(Terrien15#1), 3089K(Stelzer13), 3100+-65K(Gaidos14), 3289K(Terrien15#3), 3366K(Terrien15#2) => adopt Teff=3100K. GJ 1230B = LDS 6330B = LSPM J1841+2447N *M4.5V: Henry94,Henry02 M5V: Hawley97(M5),Newton14(near-IR) GJ 1230 A and B are separated by ~4.8" (WDS). Henry94/02 calls "B" a M4.5V and "AC" a M4.5VJ, but "B" is 1.3 mag fainter than "AC". Teffs: 2185+-375K(Gaidos14), 2714K(Jenkins09), 3289K(Terrien15#1), 3283K(Terrien15#2). # Other stars of note: CM Dra The famous M dwarf eclipsing binary CM Dra is M4.5Ve (e.g. Viti+2002, Geballe+02, Reid+04), but is apparently population II (low metallicity, [M/H] ~ -1 to -0.6 ; Morales+2009), however it has been noted multiple times (Metcalfe+1996, Morales+2009) that it closely resembles the spectrum of Barnard's star, so it may be closer to M4Ve. The parameters from Morales+2009: M1 = 0.2310 +- 0.0009 Msun M2 = 0.2141 +- 0.0010 Msun R1 = 0.2534 +- 0.0019 Rsun R2 = 0.2396 +- 0.0015 Rsun T1 = 3130 +- 70 K T2 = 3120 +- 70 K logL1 = -2.258 +- 0.038 dex logL2 = -2.313 +- 0.056 dex Photometry: U = 15.55 ; Lacy77(outside of eclipse, 1975, KPNO 1.3m); Mermilliod91 B = 14.50 ; Lacy77(outside of eclipse, 1975, KPNO 1.3m); Mermilliod91 V = 12.90 ; Lacy77(outside of eclipse, 1975, KPNO 1.3m), Mermilliod91 V = 13.66 ; Reid04 R = 11.07 ; Lacy77(outside of eclipse, 1975, KPNO 1.3m) I = 9.61 ; Lacy77(outside of eclipse, 1975, KPNO 1.3m) J = 8.68 ; Lacy77(outside of eclipse, 1975, KPNO 1.3m) J = 8.501 +- 0.020 ; 2MASS H = 8.12 ; Lacy77(outside of eclipse, 1975, KPNO 1.3m) H = 8.039 +- 0.026 ; 2MASS K = 7.84 ; Lacy77(outside of eclipse, 1975, KPNO 1.3m) Ks = 7.796 +- 0.021 ; 2MASS L = 7.82 ; Lacy77(outside of eclipse, 1975, KPNO 1.3m) M = 8.8: ; Lacy77(outside of eclipse, 1975, KPNO 1.3m) fbol = 1.60+-0.08 e-2 W/m^2 ; Lacy77(outside of eclipse) B-V = 1.60 ; Lacy77(outside of eclipse, 1975, KPNO 1.3m) Assuming both stars to be of similar brightness, then this would suggest colors of: V-J = 12.90 - 8.051 = 4.849 V-H = 12.90 - 8.039 = 4.861 V-Ks = 12.90 - 7.796 = 5.104 (M3V=4.66,M4V=5.24)