K7III The K7III dagger standards in MK73 were converted to K4-K6 III standards in Keenan89. Alf Lyn is probably the best K7III standard. 29 Her is a southernly accessible K7III standard, but its type has shifted a bit over the years. MK73 dagger standard: 31 Lyn (=HR 3275) - K7III alf Lyn (=HR 3705) - K7IIIab 29 Her (=HR 6159) - K7III Keenan89 standard: HD 194193 - K7III Kirkpatrick91 standard: HR 152 - K7III [from KeenanMcNeil76] BD+59_128 - K7III [from Jacoby84] GrayAtlas standard: alf Lyn (=HR 3705) - K7IIIab GrayNstars standard: alf Lyn (=HR 3705) - K7IIIab HR 341 - K7III GrayCorbally10 standard: alf Lyn (=HR 3705) - K7III (J-H)(K7III) = 0.691 ; smoothed relation from giants in Skiff compendium w/i 15 deg of NGP, 2MASS photometry AAA flags => adopt (J-H)(K7III) = 0.691 [updated 10/30/2020] (H-Ks)(K7III) = 0.190 ; smoothed relation from giants in Skiff compendium w/i 15 deg of NGP, 2MASS photometry AAA flags => adopt (H-Ks)(K7III) = 0.190 [updated 10/30/2020] # No standards MK43, JM53, Landi Dessy & Keenan (1966), and Deutsch69 do not list any standards between K5III and M0III. Gray03 lists one K7III star: BD+43_1596 (fainter of 30" pair to apparently unrelated brighter G0V star 56 Aur). # Primary standards HD 194193 (J2022+4101; V=5.9) K7III: Keenan89(stan) K5: Canon,Lee47 K2.5V: Uranova77 M0III: Adams26 Only K7III standard in Keenan89. plx = 3.74+-0.54 mas (ASCC). Keenan89 is only reference which considers it a standard. # Weak standard HR 152 = HD 3346 (J0036+4429; V=5.1) K6IIIa: Keenan89(stan),Keenan99,GrayNstars K5III: Adams35,Roman52,Jaschek64(all) K7III: Kirkpatrick91(from KeenanMcNeil76) K5: Cannon,Hossack54 M0III: Henry00 Plx = 5.03+-0.76 mas (ASCC). BD+59_128 K7III: Kirkpatrick91[from Jacoby84] 29 Her = HR 6159 = HD 149161 (J1632+1129; V=4.84) K7III: MK73(dagger),Keenan80 K4.5III: Keenan89(stan) K4III: Roman55(Jaschek78) K5: Cannon Plx = 9.97+-0.87 mas (ASCC). Jaschek64 types are split between K4III and K5III. Was a K7III standard according to MK73 and Keenan80, then a K4.5III standard in Keenan89. 31 Lyn = HR 3275 = HD 70272 (J0822+4311; V=4.25) K7III: MK73(dagger),Keenan80 K4+III: Keenan89(stan) K4.5III: Ginestat94 K5III: Adams35,Roman52(Jaschek78),Jaschek64(all) K5: Cannon Was a K7III dagger standard in Morgan & Keenan (1973), but then K4+III standard in Keenan89. Plx = 8.27+-0.79 (ASCC). alf Lyn = HR 3705 = HD 80493 (J0921+3423; V=3.13) K7IIIab: MK73(dagger),Keenan80 K7III: GrayNstars,GrayCorbally10 K6III: Keenan89(stan),Ginestat94 M0III: Adams26,Bidelman54(Jaschek64,Jaschek78) K5: Cannon K5/M0III: Maury1897 Was a K7IIIab dagger standard in Morgan & Keenan (1973), but then K6III standard in Keenan89. Gray & Corbally (2010) and GrayNstars list alf Lyn as their K7III standard.