K3.5V No K3.5V standard stars <(B-V)>(K3V) = 0.980 ; K3V adopted <(B-V)>(K3.5V) = 1.048 ; Gray03/06 N=44 K3.5V stars d<75 pc (+-0.004 sem, +-0.027 stdev) (B-V)(K3.5V) = 1.063 ; Koen10 d<25pc median K3.5V <(B-V)>(K4V) = 1.100 ; K4V adopted => adopt (B-V)(K3.5V) = 1.05 ; updated 5/19/2018 => adopt (U-B)(K3.5V) = 0.917 => adopt (Bt-Vt)(K3.5V) = 1.239 => adopt (V-Ic)(K3.5V) = 1.108 => adopt (V-Rc)(K3.5V) = 0.592 => adopt (R-Ic)(K3.5V) = 0.515 => adopt (V-J)(K3.5V) = 1.944 => adopt (V-H)(K3.5V) = 2.464 => adopt (V-Ks)(K3.5V) = 2.582 => adopt (H-Ks)(K3.5V) = 0.118 => adopt (J-H)(K3.5V) = 0.520 => adopt (K-W1)(K3.5V) = 0.036 => adopt (V-Hp)(K3.5V) = -0.133 => adopt (W1-W2)(K3.5V) = -0.074 => adopt (W1-W3)(K3.5V) = -0.031 => adopt (W1-W4)(K3.5V) = -0.005 => adopt (G-J)(K3.5V) = 1.513 => adopt (G-Ks)(K3.5V) = 2.151 (V-Ks)(K3.5V) = 2.532 ; trend for K dwarfs (standards+exemplars) (V-Ks)(K3.5V) = 2.582 ; trend for B-V=1.05 Mv(K3.5V) = 6.79 ; Wright04 MS relation for B-V=1.05 Mv(K3.5V) = 6.79 ; Koen10 d<25pc median K3.5V Mv(K3.5V) = 6.73 ; Gray01/03/06 dwarfs, xHIP B-V/Mv, Gaspar16 |[Fe/H]|<0.05 "solar": fit for B-V=1.05 => adopt Mv(K3.5V) = 6.79 ; M_Ks=4.208, V-Ks=2.582 => adopt M_G(K3.5V) = 6.44 ; Mv=6.79, G-V=-0.35 => adopt M_Ks(K3.5V) = 4.208 ; Mv=6.79, V-Ks=2.582 M_G(K3.5V) = 6.52 ; SIMBAD d<20pc trend for V-Ks=2.582 (G-V)(K4V) = -0.42 ; adopted for K4V (G-V)(K3.5V) = -0.364 ; trend for SIMBAD d<20pc for V-Ks=2.582 (G-V)(K3.5V) = -0.348 ; smooth fit f(SpT) G9V-M0V (G-V)(K3.5V) = -0.320 ; earlier trend for B-V=1.05 (G-V)(K3V) = -0.32 ; adopted for K3V => adopt (G-V)(K3.5V) = -0.35 [updated 9/21/2021] (Bp-Rp)(K3V) = 1.21 K3V mean (Bp-Rp)(K3.5V) = 1.2896 HD_50281 K3.5V (Bp-Rp)(K3.5V) = 1.291 trend for V-Ks=2.582 (Bp-Rp)(K4V) = 1.32 K4V mean => adopt (Bp-Rp)(K3.5V) = 1.29 [updated 7/17/2020] (G-Rp)(K3V) = 0.66 ; K3V mean (G-Rp)(K3.5V) = 0.6917 ; HD_50281 K3.5V (G-Rp)(K3.5V) = 0.703 ; trend for V-Ks=2.582 (G-Rp)(K4V) = 0.70 ; K4V mean => adopt (G-Rp)(K3.5V)=0.69 [updated 7/17/2020] => adopt (Bp-G)(K3.5V)=0.60 [updated 7/17/2020; Bp-Rp=1.29, G-Rp=0.69] Teff(K3V) = 4830K ; adopted Teff(K3.5V) = 4701K ; N=89 published Teffs from PASTEL compendium for Gray03/06 K3.5V stars (+-15K sem, +-113K stdev) Teff(K4V) = 4600K ; adopted => adopt Teff(K3.5V) = 4700K ; updated 5/19/2018 => adopt BCv(K3.5V) = -0.463 [last updated 8/3/2018; adjusted so that BCv(5772K)=-0.08] logL(K3.5V) = -0.642 ; Mv=6.79, BCv=-0.446, Mbol = 6.344 => adopt logL(K3.5V) = -0.642 ; updated 5/19/2018 => adopt Mbol(K3.5V) = 6.344 ; updated 5/19/2018 Mass(K3.5V) = 0.721 Msun ; Mann18 calib for M_Ks=4.208 Mass(K3.5V) = 0.735 Msun ; 0.75 Msun for K3V, 0.72 Msun for K4V => adopt Mass(K3.5V) = 0.73 Msun [last updated 8/2/2018] Rad(K3.5V) = 0.720 Rsun ; logL=-0.642, Teff=4700K => adopt Rad(K3.5V) = 0.720 Rsun # Exemplars HD 45081 (J0618-7202; V=10.0) K3.5Vke: Gray06, Pecaut13(K3.5V) B-V=0.963+-0.056(HIP), V=9.95(HIP), Mv=7.02(Vmag from HIP, plx from HIP2) HD 50281 (J0652-0510; V=6.5) K3V: Upgren72 K3/4V: 1972AbaOB..43..109W *K3.5V: Gray03 K4: Bidelman85 K5V: Alonso-Floriano15 K6V: Adams35 B-V=1.071+-0.008(HIP), V=6.58(HIP), V=6.88(Vmag from HIP, plx from HIP2). PASTEL compendium: = 4712K(N=12), =4.405(N=8), <[Fe/H]>=+0.03(N=10). HR 1614 = HD 32147 = UGP 102 K3V: Wilson62(SB?, Balmer lines weak),Cowley67 *K3+V: Gray03 K4V: Munch44,Upgren72,Bidelman85(K4) K5V: Adams35 Published types average out to about K3.5V but never explicitly classified as such. One of 6 stars classified as K3V in Bright Star Catalog. Wide range likely do to very high metallicity: most of the published [Fe/H] values in PASTEL compendium are consistent with [Fe/H] ~ 0.3. e.g. [Fe/H] = 0.33+-0.03 (Valenti05). HD 14001 AB = GUP 31 = StKM 2-201 K3V: Upgren72(unresolved),Houk88(unresolved) K3+V(k): Gray06 K4V+K4V: Bidelman85(NaD strong) K4V: Wilson52(unresolved),Stephenson86(unresolved) 1.5" pair. Only Bidelman85 resolves, calls both components K4V. WDS reports magnitudes of 8.49 and 9.25, so big difference (delta(mag) = 0.76!) would be surprising if components had same types. Soederhjelm99 reports the binary has period 225 yr, with total mass 1.59 Msun and q=0.91. V(AB) = 7.928+-0.021(Mermilliod91), B-V(AB) = 1.040+-0.024(Mermilliod91). Mortier13 reports [Fe/H] = -0.22.