MMM6V

Kirkpatrick(in GrayCorbally09) call Gl 406 (= Wolf 359) the primary
M6V standard.

Boeshaar76 standard:         GJ 406 (=Wolf 359) - M6e (plate III standard)
Boeshaar76 standard:         GJ 65AB  - M6-e (plate IV standard)
Turnshek85 standard:         GJ 406 (=Wolf 359) - dM6e
Boeshaar85 standard:         GJ 4037 (=LHS 3339) - dM6 (in text, not Table II)
Kirkpatrick91 standards:     GJ 1245B - M6V (pri. stan.) 
		     	     GJ 65B   - M6V (pri. stan.)
		     	     GJ 406 (=Wolf 359) - M6V (pri. stan.)
		     	     LHS 5142 - M6V (sec. stan.)
Kirkpatrick97 standard:      GJ 406 (=Wolf 359) - M6V
Hawley02 standard:           2MASS J0435+1537 - M6V
Henry02 standards:           GJ 65B   - M6V 
		     	     GJ 283B  - M6V 
		     	     GJ 406 (=Wolf 359) - M6V
		     	     GJ 1245B - M6V
Henry04 standard:            GJ 406 (=Wolf 359) - M6.0V (pri. stan.)
Kirkpatrick(GrayCorbally09): Gl 406 (=Wolf 359) - M6V (pri. stan.)
Kirkpatrick10 standard:      GJ 3146 (LHS 1375) - M6V (opt.,near-IR stan.)
Pecaut13 standard:	     GJ 406 (=Wolf 359) - M6V
Newton14 standard:           GJ 406 - M6V
Kirkpatrick16 standard:      GJ 406 (=Wolf 359) - M6V

RECONS shows GJ 406 (=Wolf 359; J1056+0700) as the nearest M6V star,
followed by GJ 65B (J0139-1757), & GJ 1245B (J1953+4424).

<B-V>(M6V)  =   1.64  ; Fitzgerald70
<B-V>(M6V)  =   1.72  ; Johnson66
(B-V)(M6V)  =   1.73  ; SchmidtKaler82
(B-V)(M6V)  = 1.83  ; sec. stan. GJ 283B 
(B-V)(M6V)  =   1.95  ; Leggett92 "young disk"
(B-V)(M6V)  = 1.98  ; sec. stan. GJ 1245B
(B-V)(M6V)  = 1.98  ; ter. stan. GJ 3146
(B-V)(M6V)  = 1.99  ; prim. stan. GJ 406 (Kilkenny98)
<B-V>(M6V)  =   2.0+  ; Bessell79
(B-V)(M6V)  = 2.034 +- 0.0069 ; prim. stan. GJ 406 (Landolt09)
(B-V)(M6V)  =   2.06  ; Bessell91 "old disk"
=> adopt (B-V)(M6V) = 2.00 

<U-B>(M6V)  = 1.27            ; Johnson66
(U-B)(M6V)  = 1.26	      ; U-B vs. B-V trend from Landolt09 for B-V=2.00 (very few points)
(U-B)(M6V)  = 1.165 +- 0.0346 ; pri. stan. GJ 406; Landolt09
=> adopt (U-B)(M6V) = 1.3

(V-Rc)(M6V) = 1.823 +- 0.0073 ; pri. stan. GJ 406 (Landolt09)
(V-Rc)(M6V) = 1.91 ; Bessell91 "old disk"
<V-Rc>(M6V) = 1.93 ; Johnson66
(V-Rc)(M6V) = 1.95  ; adopting V-I=4.10, R-I=2.15 (see below)
(V-Rc)(M6V) = 2.25 ; non-standard LHS 2026 
=> adopt (V-Rc) = 1.95 

(V-Ic)(M6V) = 4.62  ; non-standard LHS 2026
(V-Ic)(M6V) = 4.45  ; non-standard LHS 2471
(V-Ic)(M6V) = 4.22  ; non-standard LHS 1604 
(V-Ic)(M6V) = 4.20  ; non-standard LHS 2314
(V-Ic)(M6V) = 4.14  ; non-standard GJ 316.1
(V-Ic)(M6V) =   4.13 ; Bessell91 "old disk"
(V-Ic)(M6V) = 4.11  ; sec. stan. GJ 283B 
(V-Ic)(M6V) = 4.000 +- 0.0062 ; pri. stan. GJ 406 (Landolt09)
(V-Ic)(M6V) =   4.0  ; Hawley96
<V-Ic>(M6V) =   3.76 ; Johnson66
(V-Ic)(M6V) =   3.75 ; Leggett92 "young disk"
(V-Ic)(M6V) = 3.740 ; sec. stan. GJ 1245B 
<V-Ic>(M6V) =   3.58 ; Bessell79
=> adopt (V-Ic)(M6V) = 4.10

(R-I)(M6V)  = 2.152 ; N=4 M6Vs in Liebert06 (+-0.045 sem, +-0.090 rms)
(R-I)(M6V)  = 2.174 +-0.0025 ; pri. stan. GJ 406 (Landolt09)
<R-I>(M6V)  = 2.18 ; Bessell79
(R-I)(M6V)  = 2.22 ; Bessell91 "old disk"
=> adopt (V-Rc)(M6V) = 2.16

<V-J>(M6V)  = 4.63 ; Johnson66
<V-J>(M6V)  = 6.204 +-0.167 (sem) (stdev = 0.334) (N=4 stans)

<V-Ks>(M6V)    =   5.58  ; Johnson66
(V-Ks)(M6V)    = 6.603 ; sec. stan. GJ 1245B
<V-K_CIT>(M6V) =   6.65  ; Beuermann06
(V-K_CIT)(M6V) =   6.65  ; Leggett92 "young disk"
(V-Ks)(M6V)    = 6.809 ; ter. stan. GJ 3146
(V-K)(M6V)     =   7.0   ; Hawley96
(V-Ks)(M6V)    = 7.259 ; ter. stan. GJ 283B
(V-Ks)(M6V)    = 7.34  ; ter. stan. LHS 5142
(V-K)(M6V)     =   7.37  ; Bessell91 "old disk"
(V-Ks)(M6V)    = 7.445 ; prim. stan. GJ 406
(V-Ks)(M6V)    =  7.514 ; non-standard LHS 2314
(V-Ks)(M6V)    =  7.544 ; non-standard GJ 316.1
(V-Ks)(M6V)    =  7.788 ; non-standard LHS 1604
(V-Ks)(M6V)    =  7.798 ; non-standard LHS 2026
(V-Ks)(M6V)    =  7.848 ; non-standard LHS 2471
=> adopt (V-Ks)(M6V) = 7.30 ***

[note that GJ 406 appears to be redder than the other M6V standards, but not
so red compared to non-standard M6Vs]

=> adopt (V-J)(M6V)  = 6.343
=> adopt (V-H)(M6V)  = 6.948
=> adopt (I-Ks)(M6V) = 3.186 

(J-H)(M6V)     = 0.648 (+-0.012 sem,+-0.033 stdev) ; N=7 M6V Cruz03
(J-H)(M6V)     = 0.605 ; color-color-trend for V-K=7.30
=> adopt (J-H)(M6V) = 0.605

<J-K_CIT>(M6V) = 0.89 ; Beuermann06
(J-Ks)(M6V)    = 0.957 ; color-color trend for V-K=7.30
(J-Ks)(M6V)    = 1.028 (+-0.017 sem,+-0.036 stdev) ; N=7 M6V Cruz03
=> adopt (J-Ks)(M6V) = 0.957

<H-K_CIT>(M6V) = 0.33 ; Beuermann06
(H-Ks)(M6V)    = 0.352 ; color-color trend for V-K=7.30
(H-Ks)(M6V)    = 0.391 (+-0.013 sem,+-0.029 stdev) ; N=7 M6V Cruz03

(Ks-L')(M6V) = 0.320 ; Dupuy12 polynomial

(Bp-Rp)(M6V) = 3.8419 ; GJ_1245B 
(Bp-Rp)(M6V) = 3.9546 ; GJ_3146 
(Bp-Rp)(M6V) = 3.9546 ; GJ_65B 
(Bp-Rp)(M6V) = 4.3916 ; GJ_283B
(Bp-Rp)(M6V) = 4.4644 ; LHS_5142
=> adopt (Bp-Rp)(M6V) = 3.96 [updated 12/10/2018]

(G-Rp)(M6V) = 1.4076 ; GJ_1245B
(G-Rp)(M6V) = 1.4208 ; GJ_3146 
(G-Rp)(M6V) = 1.4568 ; GJ_65B 
(G-Rp)(M6V) = 1.4724 ; GJ_283B 
(G-Rp)(M6V) = 1.5009 ; LHS_5142
=> adopt (G-Rp)(M6V) = 1.46 [updated 12/10/2018]

(Bp-G)(M6V) = 2.4343 ; GJ_1245B 
(Bp-G)(M6V) = 2.4978 ; GJ_65B 
(Bp-G)(M6V) = 2.5337 ; GJ_3146 
(Bp-G)(M6V) = 2.9192 ; GJ_283B 
(Bp-G)(M6V) = 2.9635 ; LHS_5142
=> adopt (Bp-G)(M6V) = 2.50 [updated 12/10/2018; adjusted a bit to fit better determined Bp-Gp, G-Rp]

(G-V)(M6V) = -2.7111 ; GJ_283B
(G-V)(M6V) = -2.2106 ; GJ_3146   
(G-V)(M6V) = -2.071  ; GJ_1245B  
(G-V)(M6V) = -1.6859 ; GJ_65B
=> adopt (G-V)(M6V) = -2.14 [updated 12/10/2018]

Teff(M6V) =   3190 K ; Bertone04[NextGen]
Teff(M6V) =   3050 K ; Schmidt-Kaler82
Teff(M6V) = 2967 K ; Rajpurohit18 (mean for N=3 M6Vs)
Teff(M6V) =   2950 K ; Johnson66
Teff(M6V) = 2950 K ; ter. stan. GJ 65
Teff(M6V) = 2900 K ; ter. stan. GJ 3146
Teff(M6V) = 2883 K ; RojasAyala12(mean N=13 M6V stars)
Teff(M6V) = 2881 K ; sec. stan. GJ 1245B (median Teff) 
Teff(M6V) = 2857 K ; pri. stan. GJ 406 (median Teff)
Teff(M6V) =   2846 K ; Golimowski04
Teff(M6V) =   2800 K ; Bessell91 "old disk"
Teff(M6V) = 2800 K ; Rajpurohit13(N=2)
Teff(M6V) =   2750 K ; Bessell79 (Blackbody Teffs from Veeder74)
Teff(M6V) = 2758 K ; EEM N=34 Teffs
Teff(M6V) =  2520 K ; ter. stan. GJ 283B (single Teff calculated from V-K)
=> adopt Teff(M6V) = 2880 K (logT = 3.459) [last updated 11/13/2018]

BCv(M6V) =   -2.32 mag  ; Bertone04[NextGen]
BCv(M6V) =   -3.007 mag ; Casagrande08 for Teff=2850K
BCv(M6V) =   -3.08 mag  ; Schmidt-Kaler82(BCv=-3.21 + 0.13 offset)
BCv(M6V) = -3.753 mag   ; sec. stan. GJ 1245B (calc using Mann15)
BCv(M6V) = -4.136 mag   ; consensus trend for Teff=2850K
BCv(M6V) = -4.305 mag   ; Mann15(V-J=6.343)
BCv(M6V) = -4.36  mag   ; BC_K=2.94, V-K=7.30
BCv(M6V) = -4.413 mag   ; pri. stan. GJ 406, using Mann15
BCv(M6V) =   -4.43 mag  ; Bessell91("old disk"; BCv = (V-I)-BC_I)
BCv(M6V) =   -4.438 mag ; pri. stan. GJ 406/LHS 36 (Golimowski04; using BC_Ks & calc. Mv)
BCv(M6V) =   -4.487 mag ; pri. stan. GJ 406, using Pavlenko06 below
=> adopt BCv(M6V) = -4.36 mag [last updated 3/8/2018; BC_Ks=2.98, V-Ks=7.30]

BC_K(M6V) = 3.034 mag ; Golimowski04(SpT function)
BC_K(M6V) = 3.01  mag ; pri. stan. Wolf359/LHS 36 (Golimowski04)
BC_K(M6V) = 3.010 mag ; pri. stan. Wolf359 (calc. using Mann15)
BC_K(M6V) = 2.994 mag ; Mann15(V-J=6.343)
BC_K(M6V) = 2.97  mag ; LHS 36 (Leggett01)
BC_K(M6V) = 2.946 mag ; Leggett01 polynomial for I-K=3.186
BC_K(M6V) = 2.936 mag ; pri. stan. Wolf359 (calc using Pavlenko06)
BC_K(M6V) = 2.921 mag ; smoothed trend over M0V-M9V for M6V
BC_K(M6V) = 2.870 mag ; sec. stan. GJ 1245B (calc using Mann15)
BC_K(M6V) = 2.855 mag ; Leggett01 polynomial for J-K=0.957
=> adopt BC_Ks(M6V) = 2.94 mag [last updated 3/8/2018]

Mv(M6V) =  11.47 ; Wegner07 (clearly in error, or biased somehow!)
Mv(M6V) =  13.5  ; Schmidt-Kaler82
Mv(M6V) = 15.70  ; sec. stan. GJ 1245B
Mv(M6V) = 16.17  ; Henry94
Mv(M6V) =  16.49 ; Kirkpatrick94
Mv(M6V) = 16.60  ; Dieterich14 calibration for V-Ks=7.30
Mv(M6V) = 16.62  ; pri. stan. GJ 406
Mv(M6V) =  16.7  ; Reid04
Mv(M6V) = 16.80  ; sec. stan. GJ 283B
Mv(M6V) = 16.88  ; EEM fit to Reid CNS3 data for V-K=7.30)
=> adopt Mv(M6V) = 16.62 mag  [for V-Ks=7.30, M_Ks=9.32; and ident. to Mv for GJ 406; 3/8/2018]

M_Ks(M6V) = 9.10  ; sec. stan. GJ1245B
M_Ks(M6V) = 9.15  ; ter. stan. GJ3146
M_Ks(M6V) = 9.20  ; pri. stan. GJ406/Wolf359
M_Ks(M6V) = 9.30  ; Dieterich14 calibration for V-Ks=7.30
M_Ks(M6V) = 9.31  ; Dupuy12 mean 
M_Ks(M6V) = 9.32  ; V-K=7.30, Mv=16.62
M_Ks(M6V) = 9.34  ; Finch14 calibration for V-Ks=7.30
M_Ks(M6V) = 9.388 ; Dupuy12 polynomial
M_Ks(M6V) = 9.55  ; ter. stan. GJ 283B 
M_Ks(M6V) = 9.58  ; EEM fit to Reid CNS3 data for V-K=7.30
M_Ks(M6V) = 9.66  ; ter. stan. LHS 5142
=> adopt M_Ks(M6V) = 9.32 mag [last updated 3/8/2018; V-Ks=7.30, Mv=16.62]

logL(M6V) = -3.018 dex ; Mv=16.62, BCv=-4.32 => Mbol = 12.300
logL(M6V) = -3.018 dex ; M_Ks=9.32, BC_Ks=2.98 => Mbol = 12.300
logL(M6V) =  -2.97+-0.02 dex ; non stan. LHS 36 (Golimowski04)
logL(M6V) =  -2.97 dex ; LHS 36 (Leggett01)
logL(M6V) =  -2.82 dex ; sec. stan. GJ 1245B (see below)
=> adopt logL(M6V) = -3.018 dex
=> adopt Mbol(M6V) = 12.300 mag

Mass(M6V) = 0.098 Msun ; Mv=16.88 => Delfosse10 calibration
Mass(M6V) = 0.099 Msun ; M_Ks=9.30 => Delfosse10 calibration
Mass(M6V) = 0.101 Msun ; M_Ks=9.32 => Mann18 calib.
Mass(M6V) = 0.101 Msun ; pri. stan. GJ 406 (Jenkins09)
Mass(M6V) = 0.105 Msun ; M_Ks=9.32 => Benedict16 calibration
Mass(M6V) = 0.108 Msun ; sec. stan. GJ 1245B (Jenkins09)
Mass(M6V) = 0.1195 Msun ; GJ 65B (dynamical)
=> adopt Mass(M6V) = 0.101 Msun [last updated 8/2/2018]

# No Standards

Houk75, Boeshaar85, Keenan85 do not list M6V standards

# Primary Standard

GJ 406 = Wolf 359 = LHS 36 = CN Leo = StKM 2-681 (J1056+0700)
  M5.5V: Hawley97
  M5.9: Mann15
 *M6.0V: Boeshaar76,Turnshek85(stan;dM6e),Bidelman85(M6),Bessell91(M6Ve),Kirkpatrick91(pri),Kirkpatrick93,Kirkpatrick94,Kirkpatrick97(stan),Henry02,Geballe02,Henry04(M6.0Ve),Kirkpatrick(GrayCorbally09),Newton14(stan)
  M6.5Ve: Joy74,Mukai90(M6.5)
  M8:e: : Stephenson86

  Undoubtedly the most agreed upon M6V standard.
  V=13.529+-0.025(Mermilliod91), V=13.53(Kilkenny98),
  V=13.507+-0.006(Landolt09), V=13.52(Bessell83),
  B-V=2.013+-0.018(Mermilliod91), B-V=2.034+-0.0069(Landolt09),
  B-V=2.00(Bessell83), U-B=1.268+-0.131(Mermilliod91),
  U-B=1.165+-0.0346(Landolt09), V-I=5.12(Morel78),
  V-Ic=4.037(Bessell83), V-Ic=4.000+-0.0062 (Landolt09),
  V-Ic=4.032(Kilkenny98), V-Rc=1.856(Kilkenny98),
  V-Rc=1.860(Bessell83), R-Ic=2.177(Bessell83), R-I=2.46(Morel78),
  R-Ic=2.174+-0.0025(Landolt09), R-Ic=2.176(Kilkenny98),
  J=7.085+-0.024(2MASS), H=6.482+-0.042(2MASS),
  Ks=6.084+-0.017(2MASS), V-J=6.444(Mermilliod91 & 2MASS),
  (V-Ks)=7.445(Mermilliod91 & 2MASS), plx = 418.9+-2.4 mas
  (Harrington93). Mbol=12.18+-0.08(Golimowski04),
  BC_Ks=3.01+-0.07(Golimowski04), log(L/Lsun)=-2.97+-0.02
  dex(Golimowski04). Mv = 16.618+-0.012 mag, M_Ks = 9.20+-0.02 mag.
  Hence BCv = Mbol - Mv = 12.18 - 16.618 = -4.438.  Mass:
  0.101Msun(Jenkins09).  Teffs: 2500K(Casagrande08), 2520K(Jenkins09),
  2600K(Leggett00), 2700K(Dieterich14), 2800K(Pavlenko06),
  2808+-27K(Mann15#2), 2818+-60K(Mann15#1), 2857+-112K(Newton14),
  2865+-60K(Gaidos14), 2887+-20K(RojasAyala12), 2900K(Golimowski04),
  2900K(Rajpurohit18), 2911K(Rice10), 
  3000+-100K(Jones02,[Fe/H]=-0.5+-0.5), 3185K(Terrien15#1),
  3356K(Terrien15#2) => Adopt Teff = 2857K.  Rojas-Ayala12 estimates
  [Fe/H] ~ 0.18+-0.17, and Newton15 [Fe/H] ~ 0.31 or 0.30. Yes,
  systematic error among several modern Teff estimates for arguably
  the best studied M6V star is at the +-250K level! Jone's IR
  spectroscopy was compatible with Teff=2900K for [Fe/H]=-1.0 and
  Teff=3100K for [Fe/H]=0.0. mbol = 9.02(Pavlenko06; assumes MbolSun =
  4.75, Lsun=3.86e26), mbol = 9.07(Leggett00). The Pavlenko06 mbol is
  approximately consistent with BCv = mbol - V = 9.02 - 13.507 =
  -4.487, BC_Ks = 9.02 - 6.084 = 2.936.  Mann15 estimates fbol =
  (0.57980+-0.00690)e-11 W/m2, on IAU2015 scale mbol = 9.094+-0.013,
  hence BC_Ks = 9.094 - 6.084 = 3.01, BCv = 9.094 - 13.507 = -4.413.

# Secondary Standard

GJ 1245B = G 208-45 = LHS 3495 = NLTT 48415
 *M6V: Rodono80,McCarthy88,Kirkpatrick91(pri),Kirkpatrick93,Kirkpatrick94,Geballe02,CNS4
  M5.5V: Boeshaar85(dM5.5),Reid04

  7" away from G208-44 = GJ 1245AC, and *not* G 208-44, which is
  considered a M5.5V standard, even though Reid04 classify "C" as a
  M7V.  V=13.990(Mermilliod91), V=14.01(CNS4,Henry04),
  B-V=1.980(Mermilliod91), B-V=1.97(CNS4), Rc=12.36(Henry04),
  R-I=2.07(Delfosse98,CNS4), V-Rc = 1.65(Henry04), Ic=10.27(Henry04),
  V-Ic=3.74(Reid04,Henry04), J=8.275+-0.026(2MASS),
  H=7.728+-0.031(2MASS), Ks=7.387+-0.018(2MASS),
  V-J=5.715(Mermilliod91 & 2MASS), (V-Ks)=6.603(Mermilliod91 & 2MASS).
  Plx = 220.2+-1.5mas(Harrington93). Mv = 15.70+-0.01 mag, M_Ks = 9.10
  +- 0.02 mag.  Mass: 0.108Msun(Jenkins09). Using Casagrande10
  relations, I estimate mbol=10.085+-0.025 mag, hence for Harrington93
  parallax => Mbol=11.80mag, logL=-2.82. Mann15 estimates fbol =
  (0.1986+-0.0032)e-11 W/m2, on IAU2015 scale mbol = 10.257+-0.017.
  Hence BC_Ks = mbol - Ks = 10.257 - 7.387 = 2.87, BCv = 10.257 -
  14.01 = -3.753.  Teffs: 2673K(Jenkins09), 2859K(Mann15#1),
  2881K(RojasAyala12), 2919+-34K(Mann15#2), 2944+-60K(Gaidos14) =>
  median Teff = 2881K.

# Tertiary Standard

GJ 283B = L 745-46B = LFT 544 = LHS 234
 *M6.0V: Bessell91(M6e),Henry94,Hawley97,Henry02,Reid04
  M6.5V: Dieterich

  Star does not appear to be as well studied as the other standards,
  and has only one published Teff estimate.  No type listed in
  Hawley97.  Note that Bessell type is for "GJ 283" or "LHS 234"?  GJ
  283A is DA3 or DC or DZ6 white dwarf 21" away.  V=14.47(Salim03, bad
  value?), V=16.42(Gliese91,Reid04), V=16.55(vanAltena95),
  V=16.54(Bessell91), V=16.67(Hawley97) [I adopt value from
  vanAltena95], B-V=1.83(Gliese91), Ic=12.43(Bessell91),
  V-I=4.110(Casagrande08), Rc=14.68(Bessell91),
  V-R=1.860(Casagrande08), V-J=4.31(Salim03) J=10.155+-0.022(2MASS),
  H=9.628+-0.023(2MASS), Ks=9.291+-0.022(2MASS), V-J=6.395(vanAltena95
  & 2MASS), (V-Ks)=7.259(vanAltena95 & 2MASS), V-K=7.40(Hosey15). Plx
  = 112.4+-2.7 mas (vanAltena95). M_Ks = 9.55+-0.06 mag, Mv =
  16.80+-0.05 mag.  Using Casagrande08 relations, I estimate m_bol =
  12.11+-0.02 mag (the JHK m_bols agree within 0.03 mag). Teffs:
  2520K(V-K=>Casagrande08),
  2900K(Rajpurohit18). [Fe/H]=+0.2(Rajpurohit18).

LHS 5142 = LP 606-35
 *M6V: Kirkpatrick91(sec),Kirkpatrick95,Kirkpatrick11
  M6.5: Kirkpatrick93
  M7: West08(M7e),Burgasser15
  M8e: West11

  DwarfArchives cites Kirkpatrick91. V=18.50(Lepine05),
  I=14.527+-0.03(DENIS), J=12.106+-0.024(2MASS),
  H=11.538+-0.023(2MASS), Ks=11.161+-0.021(2MASS) V-J=6.39(Lepine05 &
  2MASS), (V-Ks)=7.34(Lepine05 & 2MASS). plx = 50.1+-3.8mas(Dittman14)
  => M_Ks=9.66+-0.17(2MASS,Dittman14), Mv=17.00(Lepine05,Dittman14).
  Per = 1.663d(Newton16). No published Teff estimates.

GJ 65B = UV Ceti = L 726-8B = LHS 10 
 *M6.0V: Joy74,Kirkpatrick91(pri),Kirkpatrick94,Henry94,Henry02,Dieterich12
  M6-e: Boeshaar76(stan,GJ65AB)
  M5.5: Cruz02,Reid04

  Washington Double Star catalog lists GJ 65 (WDS 01388-1758 = LDS
  838) as a 2.1" binary as of epoch 2010, with V mags of 12.7(A) and
  13.2(B). GJ 65B (LHS 10) is the infamous star "UV Ceti". Kervella16
  conducts comprehensive interferometric and dynamical study of this
  system. Joy74, Kirkpatrick91, and Henry02 call consider the pair of
  stars A & B to be M5.5V and M6.0V, respectively. Reid04 lists GJ
  65AB as M5.5V, but lists B as a M5.5V also. Boeshaar76 and
  Boeshaar94 call the unresolved pair M6-V, while Reid04 calls the
  unresolved pair M5.5V.  So most experts consider A & B to be ~0.5
  subtype different, and they are ~0.5 mag different in V
  magnitude. It's not obvious that such a system is optimal for use as
  a standard star(s), especially if one is not blessed with <1"
  seeing. plx = 375+-4 mas(Geyer88), 373.7+-2.7mas(vanAltena95). The
  2MASS JHK and Mermilliod91 UBV photometry for GJ 65AB is unresolved:
  J=6.283+-0.019, H=5.690+-0.029, Ks=5.343+-0.021. Teffs:
  2900K(Kochukhov17), ~2900K(Kervella16,evol.track),
  ~3000K(Kervella16,adopted for limb darkening),
  3167+-12K(Kovaleva12), => adopt <Teff> = 2950K. Kervella16 lists:
  M=0.1195+-0.0043 Msun, logg=5.113+-0.015, [Fe/H]=-0.12+-0.20 (A is
  -0.03+-0.20), R=0.159+-0.006 Rsun, Radius inflacted ~13% in both
  stars, presumably due to inhibition of convection by magnetic
  fields. vsini = 30.6+-2 km/s. 

GJ 3146 = LHS 1375 = 2MASS J02162977+1335136
 *M6V: Henry04,Kirkpatrick10(opt.,near-IR),Rojas-Ayala12,Newton14(near-IR)
  M6.1: Mann15
  M6.39: Newton14(from Terrien15)
  M5.5V: Reid04,Dieterich12,Stelzer13,Cortes-Contreras17

  V=15.790(Mermilliod91), B-V=1.980(Mermilliod91),
  J=9.871+-0.021(2MASS), H=9.314+-0.022(2MASS),
  Ks=8.981+-0.017(2MASS).  V-Ks=6.809(Mermilliod91,2MASS).  plx =
  108.3+-5.0mas(Dittman14) => Mv=15.96, M_Ks=9.15. Teff =
  2829+-60K(Mann15), 2868+-21K(Rojas-Ayala12), 2899+-48K(Mann15#2),
  2936K(Stelzer13), 3181K(Terrien15#1), 3312K(Terrien15#2) => adopt
  Teff=2900K
  
# Deprecated Standards

GJ 4037 = LHS 3339 = LP 102-320 = NLTT 45700
 *M5.5V: Kirkpatrick91(sec)
  M6V: Boeshaar85(stan),Hawley97,Geballe02,Basri06
  M5V: Reid04

  Depricated as a standard as it appears to have been little used
  since Kirkpatrick91.  plx=61.10+-3.90mas(Dittman14), but see
  Dahn02. Not in Washington Double Star Catalog.  Dahn02 derives:
  plx=46.4+-1.1 mas ((m-M)=1.67+-0.05), V=17.98+-0.02, R=16.20+-0.020,
  I=14.03+-0.01, K=10.78+-0.03, M_J = 10.05, BC_J = 2.02, Mbol =
  12.07, R = 0.1308 Rsun, Teff = 2957+-70K. Hence, mbol = 13.74, and
  BCv = 13.74 - 17.98 = -4.24, BC_K = 13.74 - 10.875 =
  2.87. V=17.90(Lepine05), V=17.98(Gliese91, vanAltena95),
  V=17.43(Salim03), J=11.819+-0.023(2MASS), H = 11.227+-0.023(2MASS),
  Ks=10.875+-0.016(2MASS). V-Ks=17.98-10.875=7.105. Teffs:
  4100K(Morales08).

2MASS J0435+1537 = 2MASS J04354898+1537198 = 2MASSW J0435489+153719
  M6V: Gizis99(M6e),Hawley02(stan)

  Only 6 SIMBAD references - 1999-2008.  Discovered by Gizis99. Not
  used as a standard anywhere else besides Hawley02. Poorly studied.

# Non-standards

GJ 15 B = HD 1326 B = BD+43_44B = GQ And = LHS 4
  M6V: JM53(non-standard)

GJ 1245C = G 208-44B
  M6.0V: Kirkpatrick91,Henry02
  M5.5V: Hawley97,Reid04
  
  binary with GJ 1245 AC (M5.5V+M7.0V)

LHS 1604 = DENIS J0351000-005244 = SDSS J035100.03-005245.9 = LP 593-68  
  M6.0V: Cruz02,Henry04
  M8e: West08
  M7e: West11
  M5.5/7.0e: Crifo05
  M7.5: Cruz03

  Not good agreement on types. V=18.02(Henry04), Ic=13.80(Henry04),
  V-Ic = 4.22(Henry04), J=11.302+-0.024(2MASS),
  H=10.609+-0.022(2MASS), Ks=10.232+-0.024(2MASS).  V-Ks = 18.02 -
  10.232 = 7.788.

LHS 2026
  M6.0V: Henry04

  V=18.94(Henry04), Rc=16.69(Henry04), Ic=14.32(Henry04),
  V-Rc=2.25(Henry04), V-Ic=4.62(Henry04), J = 12.035+-0.023(2M),
  H=11.477+-0.021(2M), Ks=11.142+-0.023(2M).  V-Ks = 18.94 - 11.142 =
  7.798.

GJ 316.1 = LHS 2034 = AZ Cnc
  M6.0V: Bessell91,Henry04,Shkolnik09
  M6.5Ve: Dahn85

  B-V=2.02(Dahn85), V=17.59(Henry04), V=17.68(Dahn85),
  Ic=13.45(Henry04), V-Ic=4.14(Henry04), V-I=4.34(Dahn85; "Kron-Mayall
  system"), J=11.053+-0.022(2M), H=10.419+-0.023(2M),
  Ks=10.046+-0.018(2M). V-Ks = 17.59 - 10.046 = 7.544.  plx =
  71.1+-1.0 mas (Henry04).

LHS 2471
  M6.0V: Henry04

  V=18.11(Henry04), Ic=13.66(Henry04), V-Ic=4.45(Henry04),
  J=11.256+-0.022(2M), H=10.660+-0.027(2M), Ks=10.262+-0.022(2M).
  V-Ks = 18.11 - 10.262 = 7.848.

LHS 2314
  M6.0V: Henry04
  
  V=19.11(Henry04), Ic=14.91(Henry04), V-Ic=4.20(Henry04),
  J=12.535+-0.024(2M), H=11.970+-0.024(2M), Ks=11.596+-0.019(2M). V-Ks
  = 19.11 - 11.596 = 7.514.