A5V There is no A5V dagger type. Probably best standards are HD 23194 & HD 23886 & HD 29488 Morgan65 lists Bet Ari (HD 11636) and Del Cas (HD 8538) as their A5V standards, and classified one Hyad as A5Vn (HD 29488). MK43 lists Bet Ari as their A5V standard. GrayGarrison89 lists A5 standards HD 23194 (A5V) and HD 23886 (A5Vn). Cowley69 and Cowley74 used Del Cas & 80 UMa as their A5V standards. Skiff08 flags only HD 23886 (MK78) as a A5V MK standard. Gray01/03/06 list 2 nearby A5V dwarfs: Median HIP colors: (A5V) = 0.175 (+-0.008 sem, +-0.012 stdev; N=2) (A5V) = 0.195 (+-0.007 sem, +-0.011 stdev; N=2) # No standard MK73 does not list a A5V standard Houk does not provide an A5V primary standard, but a secondary one # good standard HD_23194 = Cl Melotte 22 232 (Pleiad) A5V: Mendoza56,Jaschek64,Jaschek78,GrayGarrison89(stan),Gray01,GrayAtlas A2: Cannon kA5hA7VmA7: Abt78 GrayGarrison89 list it as their low-vsini A5V standard HD 23886 = Cl Melotte 22 2289 A5V: MK78,Keenan85 A5Vn: GrayGarrison89(stan),Gray01 GrayGarrison89 list it as their high-vsini A5V standard Unfortunately *no* Teff estimates HD 29488 = sig2 Tau = HIP 65477 = HR 1479 (Hyad) A5V: Houk(2ndary stand.),Jaschek78(A5Vn;Cowley69),Morgan65,Slettebak55,GrayGarrison89(A5IV-V),Wilson48,Adams35 A6V: Abt95,Barry70 A3: Cannon Jaschek64 has range A3-A7, and del(Mv)=+0.13 Given its consistent A5 classification by Houk,Morgan,Cowley,Gray,Garrison, and MS position, this is probably an adequate A5V standard # other standards HD 11636 = bet Ari = 6 Ari = HR 553 = GJ 80 A5V: MK43(stan),JM53,Jaschek64(all),Morgan65,Jaschek78,Garcia89 kA4hA5mA5Va: Gray03 (i.e. an A5Va!) A5IV: Barry70 A4V: Abt85,GrayGarrison89,Abt95 A4: Olsen69 A5: Cannon Bet Ari is the A5V standard in MK43. Basically morphed from A5 under Morgan to A4 (Abt,Gray,Garrison), *despite* Morgan65 (listing bet Ari as a "fundamental A5 classification standard" w/ del Cas i.e. "Its a fundamental standard until someone comes along and changes it..." B-V(HIP)=0.165, dMv=-0.53 (color is closer to Houk's mean A4V B-V color) I'm going to stick to A5V following MK43,JM53,Morgan65,Gray03 # fair standard HD 116842 = 80 Uma = g UMa = Alcor = HR 5062 = HIP 65477 A5V: MK43,JM53,Cowley69(stan),GrayGarrison89,Abt95 A6Vnn: Gray01,Gray03 I'm going to go with continuity here - it was A5V from 1943-1995. Gray changed between 1989 and 2001-2003. Probably OK A5V standard - except its an SB B-V(HIP)=0.169, dMv=+0.13, SB # Weak Standard HD 2262 = Kap_Phe = HR 100 = HIP 2072 A5Vn: GrayGarrison89 A5IVn: Gray06 A6Vn: Abt95,Houk78(overexposed,cites Garrison unpub.) A7V: Evans61,Jaschek78(Levato72),Kennedy83(Levato72),Hoffleit91 A3: Cannon Types vary from A5V-A7V, probably not a good standard (B-V[HIP]=0.175+-0.008) HD 8538 = Del Cas = 37 Cas = HR 403 = HIP 6686 A5V: Cannon(A5),MK53,JM53,Jaschek64,Morgan65,Cowley69(stan),Jaschek78,Kennedy83, A5III-IV: Garcia89,Hoffleit91 A5III/IV: MK78 A5IV: GrayGarrison89,Gray01 Morgan65 lists del Cas as a "fundamental A5 classification standard" w/ bet Ari *Everyone* calls this A5-something par(HIP)=32.8+-1.5 mas, D~30pc (Local Bubble), B-V=0.160, dMv=-1.6mag (near turnoff) Probably should be considered excellent "A5IV" standard Alf Oph A5Vnn: Garrison96 GrayGarrison89 reject Alf Oph as a suitable standard (long discussion). Vsini ~ 215 km/s. Morgan84 considers the star the A5III standard.