B9.5V Garrison94 does not list a B9.5V anchor standard, and MK73 does not list a B9.5V dagger standard. Unfortunately B9.5V standards were not defined/clarified by GrayGarrison87 (on early A type stars) nor in GarrisonGray94 (on late B type stars). GrayGarrison87 retained HD 23873 as B9.5Va, however the same study considered the B9.5V MK78 standard HD 19805 to be A0Va+. JM53 standard: ome^2 Aqr - B9.5V Cowley69 standard: ome^2 Aqr - B9.5V Cowley72 standard: ome^2 Aqr - B9.5V MK78 standard: HD 19805 - B9.5V HD 23873 (= Hz I 910) - B9.5V Keenan85 standard: HD 19805 (typo - written "HD 19803", which is a K1III!) - B9.5V WiegertGarrison98 st.: ome^2 Aqr - B9.5V Skiff08 lists only two B9.5V standards: HD 19805 and HD 23873. All dereddenings calculated via the Q-method have been updated using the new calibration (10/11/2011). B-V(B9.5V) = -0.03 ; Morgan53, Johnson63 B-V(B9.5V) = -0.04 ; Fitzgerald70, Morgan71 B-V(B9.5V) = -0.047 ; prim. stan. ome^2 Aqr (EEM dereddened via Q-method) B-V(B9.5V) = -0.050 ; prim. stan. HD 23873 (EEM dereddened) B-V(B9.5V) = -0.052 ; EEM dereddened N=34 HIP B9.5V stars (Q-method,E(B-V)<0.1) B-V(B9.5V) = -0.067 ; EEM 3 d<75 pc B9.5V Hipparcos stars B-V(B9.5V) = -0.076 ; exemplar 16 Dra A = HD 150100 => adopt (B-V)(B9.5V) = -0.050 [updated 9/20/2019] U-B(B9.5V) = -0.143 ; EEM dereddened N=34 HIP B9.5V stars (Q-method,E(B-V)<0.1) U-B(B9.5V) = -0.136 ; prim. stan. HD 23873 (EEM dereddened via Q-method) U-B(B9.5V) = -0.124 ; prim. stan. ome^2 Aqr (EEM dereddened via Q-method) U-B(B9.5V) = -0.102 ; HIP d<75pc S/N>8 A0V N=4 (Mermilliod91 photometry) U-B(B9.5V) = -0.10 ; Fitzgerald70 => adopt (U-B)(B9.5V) = -0.13 *** [updated 9/26/2019] => adopt Q(B9.5V) = -0.094 (=(U-B)-0.72*(B-V) = -0.130 - 0.72*-0.050) => adopt (V-I)(B9.5V) = -0.035 => adopt (V-R)(B9.5V) = -0.017 => adopt (R-I)(B9.5V) = -0.018 => adopt (V-J)(B9.5V) = -0.025 => adopt (V-H)(B9.5V) = -0.069 => adopt (V-Ks)(B9.5V) = -0.048 => adopt (H-Ks)(B9.5V) = 0.021 => adopt (J-H)(B9.5V) = -0.044 (Ks-W1)(B9.5V) = 0.040 ; EEM trend for d<30pc for B-V=-0.045 => adopt (Ks-W1)(B9.5V) = 0.040 [updated 12/29/2019] (Bp-Rp)(B9.5V) = -0.058 ; Evans18 trend for V-I=-0.035 (G-V)(B9.5V) = -0.032 ; * lam Aql PM* B9Vn (G-V)(B9.5V) = 0.003 ; * ome02 Aqr PM* B9V (G-V)(B9.5V) = 0.00884 ; HIP_28662 B9.5V E(B-V)=0.002 (G-V)(B9.5V) = 0.01024 ; HIP_26674 B9.5V E(B-V)=0.004 (G-V)(B9.5V) = 0.01066 ; HIP_34701 B9.5V E(B-V)=0.008 (G-V)(B9.5V) = 0.0110 ; HIP_21869 B9.5V E(B-V)=0.001 (G-V)(B9.5V) = 0.0130 ; HIP_79631 B9.5V E(B-V)=0.006 (G-V)(B9.5V) = 0.013 ; * L01 Pup a2* B9V (G-V)(B9.5V) = 0.01389 ; HIP_17328 B9.5V E(B-V)=0.008 (G-V)(B9.5V) = 0.01666 ; HIP_82069 B9.5V E(B-V)=0.005 (G-V)(B9.5V) = 0.017 ; fit for B dwarfs from Kervella19 corrected for E(B-V), eval for (V-Ks)=-0.048 (G-V)(B9.5V) = 0.01755 ; HIP_32646 B9.5V E(B-V)=0.006 (G-V)(B9.5V) = 0.01801 ; HIP_28515 B9.5V E(B-V)=0.009 (G-V)(B9.5V) = 0.01977 ; HIP_113821 B9.5V E(B-V)=0.004 (G-V)(B9.5V) = 0.01995 ; HIP_17982 B9.5V E(B-V)=0.002 (G-V)(B9.5V) = 0.02202 ; HIP_111085 B9.5V E(B-V)=0.004 (G-V)(B9.5V) = 0.02901 ; HIP_32788 B9.5V E(B-V)=0.006 (G-V)(B9.5V) = 0.02983 ; HIP_32683 B9.5V E(B-V)=0.007 (G-V)(B9.5V) = 0.04569 ; HIP_108487 B9.5V E(B-V)=0.008 (G-V)(B9.5V) = 0.05829 ; HIP_108336 B9.5V E(B-V)=0.009 => adopt (G-V)(B9.5V) = 0.017 [updated 4/8/2022] V-I(B9.5V) = -0.05 ; EEM 3 d<75 pc B9.5V Hipparcos stars (g-r)(B9.5V) = -0.265 ; Covey07 interp B9V-A0V Teff(B9.5V) = 10073 K ; B-V=-0.05 => Teff(Napiwotski93) Teff(B9.5V) = 10010 K ; Schmidt-Kaler82 halfway B9V-A0V Teff(B9.5V) = 10340 K ; Theodossiou90 Teff(B9.5V) = 10390 K ; pri. stan. ome^2 Aqr (median Teff) Teff(B9.5V) = 10420 K ; exemplar 16 Dra A = HD 150100 Teff(B9.5V) = 10400 K ; Chavez95 (+150-200K) Teff(B9.5V) = 10453 K ; U-B=-0.13,Teff(Bessell98) Teff(B9.5V) = 10500 K ; sec. stan. HD 23873 Teff(B9.5V) = 10715 K ; non-standard HD 145631 (single Teff) Teff(B9.5V) = 10756 K ; B-V=-0.04,Teff(Bessell98,logg=4.3) Teff(B9.5V) = 10936 K ; EEM N=110 Teffs => adopt Teff(B9.5V) = 10400 K (logT = 4.017) [updated 10/18/2019] BCv(B9.5V) = -0.415 mag ; Flower96(Teff=10400K, set so BCv(5772K)=-0.085) BCv(B9.5V) = -0.372 mag ; Code76(Teff=10400K, set so BCv(5772K)=-0.085) BCv(B9.5V) = -0.358 mag ; Bessell98(ATLAS,logg=4.0,Teff=10400K, set so BCv(5772K)=-0.085) BCv(B9.5V) = -0.340 mag ; Balona94(Teff=10400K, set so BCv(5772K)=-0.085) BCv(B9.5V) = -0.312 mag ; Bertone04(ATLAS,Teff=10400K, set so BCv(5772K)=-0.085) BCv(B9.5V) = -0.275 mag ; Schmidt-Kaler82 (BCv=-0.405 halfway B9V-A0V + 0.13 offset) => adopt BCv(B9.5V) = -0.36 [updated 9/16/2019, adjusted so that BCv(5772K)=-0.085] Mv(B9.5V) = -0.08 mag ; exemplar 16 Dra A = HD 150100 = HR 6184 Mv(B9.5V) = 0.21 mag ; Wegner07 Mv(B9.5V) = 0.29 mag ; EEM trend to d<60pc dwarfs for B-V=-0.05 Mv(B9.5V) = 0.4 mag ; Schmidt-Kaler82 Mv(B9.5V) = 0.55 mag ; d<60pc Mv(B-V=-0.05) trend Mv(B9.5V) = 0.57 +-0.38(sem),+-0.57(st.dev.) ; EEM N=4 B9.5V HIP d<75pc Mv(B9.5V) = 0.81 mag ; deprecated stan. del CrV Mv(B9.5V) = 0.81 mag ; halfway between B9V and A0V Mvs Mv(B9.5V) = 0.88 mag ; median Mv for B9.5V calc using Kervella19 HIP & Gaia DR2 Mv(B9.5V) = 1.18 mag ; pri. stan. HD 23873 Mv(B9.5V) = 1.20 mag ; pri. stan. ome^2 Aqr => adopt Mv(B9.5V) = 0.60 mag [updated 9/20/2019] => adopt M_G(B9.5V) = 0.615 mag [updated 12/10/2020] (Mv=0.6, G-V=0.015) => adopt M_Ks(B9.5V) = 0.648 mag [updated 12/30/2020] (Mv=0.6, V-Ks=-0.048) logL(B9.5V) = 1.800 dex ; Mv=0.6, BCv=-0.36 => Mbol = 0.240 logL(B9.5V) = 1.742 dex ; logL/Teff trend for O7V-A2V EBs (Torres10; Teff=10400K) => adopt logL(B9.5V) = 1.800 dex [updated 9/26/2019] => adopt Mbol(B9.5V) = 0.240 mag [updated 9/26/2019] Mass(B9.5V) = 2.816+-0.050 Msun ; Eclipsing binary PV Cas A (Torres10) Mass(B9.5V) = 2.757+-0.054 Msun ; Eclipsing binary PV Cas B (Torres10) Mass(B9.5V) = 2.72 Msun ; EEM Mv vs. Mass fit for binaries (Mv=0.6) Mass(B9.5V) = 2.69 Msun ; Ekers18 ML calibration for logL=1.8 Mass(B9.5V) = 2.68 Msun ; EEM Teff vs. Mass fit for binaries (Teff=10600K) Mass(B9.5V) = 2.64 Msun ; Bertelli09 solar tracks Teff=10400, logL=1.8 Mass(B9.5V) = 2.63 Msun ; EEM logL vs. Mass fit for binaries (logL=1.8) Mass(B9.5V) = 2.38 Msun ; Harmanec88 Mass(B9.5V) = 2.342+-0.016 Msun ; Eclipsing binary GG Ori A (Torres10) Mass(B9.5V) = 2.338+-0.016 Msun ; Eclipsing binary GG Ori B (Torres10) => adopt Mass(B9.5V) = 2.68 Msun [updated 12/29/2019] Rad(B9.5V) = 2.447 Rsun ; logL=1.800, Teff=10400K => adopt Rad(B9.5V) = 2.447 Rsun [updated 9/26/2020] # No Standard MK43, MK73, Garrison67, Garrison79 did not list a B9.5V standard. # Primary Standards HD 222661 = ome^2 Aqr = 105 Aqr = GJ 9836A = HR 8988 *B9.5V: JM53,Cowley69(stan),Cowley72(stan),Houk88,Abt02,Zorec09 B9.5IV: Abt95,Gray87 B9V: deVaucouleur57,Cucchiaro80 Notes: 5.4" binary, deltaV=6.0, A is SB (Worley96), Gahm83 calls "B" a A5Vne. Hipparcos par=21.16+-0.87 mas => D=47.3+-1.9 pc (so likely to have negligible reddening). Mv = 1.20, D(ZAMS) = 43+-10 pc; hence near ZAMS and unevolved. B-V(HIP)=-0.032+-0.004. Johnson66: B-V=-0.04, U-B=-0.13. Av(Neckel80)=0.02. Mermilliod91: B-V=-0.041+-0.006, U-B=-0.121+-0.014 (probably unreddened since D ~ 47 pc) => updated Q-method calibration (10/11/2011) => (B-V)o=-0.047, E(B-V)= 0.006, Av=0.02, (U-B)o = -0.124 (but consistent with zero reddening given the photometric errors). Note that Castelli reddening gives Av=0.39, where Shobbrook gives Av=0.04. Teffs: 10011K(Ammler-vonEiff12), 10057K(Hauck97 phot.=>Balona94 calib.), 10160K(Hauck97 phot.=>BalonaShobbrook84 calib.), 10375+-48K(Zorec12), 10404K(U-Bo=>Bessell98), 10517K(Hauck97 phot.=>Napiwotzki93 calib.), 10860+-420K(Zorec09), 11108+-378K(David15), => median Teff = 10390K. HD 23873 = Cl Melotte 22 2263 (Pleiades member) *B9.5V: MK78(stan), Gray87(B9.5Va), Mendoza56 B9.5IVsn: Abt78 A0V: : JM53 B-V(HIP)=-0.027+-0.004. Mermilliod91: B-V=-0.027+-0.004, U-B=-0.120+-0.000 => updated Q-method calibration => B-Vo=-0.050, U-Bo=-0.136, E(B-V)=0.023, Av=0.077. D(ZAMS)=128+-29 pc (hence MS). par(HIP)=8.02+-0.91 mas => Mv = 1.18, and as a Pleiades member it should be near d ~ 133 pc (and typical Pleiad has E(B-V) = 0.04). Seems to be an OK B9.5V standard. MK78 and Gray agree on B9.5V type. Hauck97 photometry dereddened following Castelli91 yields: (b-y)0=-0.110, c0=0.891, E(b-y)=0.100, Av=0.436. Teffs: 10231K(Hauck97 phot.=>BalonaShobbrook84 calib.), 10245K(Hauck97 phot.=>Balona94 calib.), 10500K(U-Bo=>Bessell98), 10575K(Hauck97 phot.=>Napiwotzki93 calib.), 11455K(Philip80) => median Teff = 10500K. # Deprecated Standard HD 19805 = HIP 14980 = Cl Melotte 20 167 (in alpha Per cluster) B9.5V: Morgan71,Jaschek78,MK78(stan),Keenan85(see note) *A0Va+: Gray87 A0Vsp:Si: Abt78 A1V: Petrie67 B-V(HIP)=0.125+-0.008. Mermilliod91: B-V=0.121, U-B=0.030 => updated Q-method (10/11/2011) => (B-V)o=-0.018, E(B-V)=0.139, Av=0.457, D(ZAMS)=181+-40 pc. (U-B)o wasn't calculable using my current calibration as it was too close to the A0V zero color point -- so (U-B)o is near ~0.0. Alpha Per cluster member, so d ~ 180 pc with sig. reddening. Note: seems to be OK B9.5V standard except that Gray87 and Abt78 call it A0V variants, which seems justified given the (B-V) and (U-B) intrinsic colors which are a bit redder than the other B9.5V standards. Keenan85 lists "HD 19803" as a B9.5V standard, but this appears to be a typo for HD 19805 (HD 19803 is a K1III). HD 108767 = del CrV = HR 4757 B9V: MK43,Jaschek64(all),Murphy69 B9Vn: Cowley69 B9.5V: Abt81,Gahm83,Houk88,Mora01 *B9.5IV-n: GrayGarrison87 A0: Cannon Mermilliod91: V=2.948+-0.010, B-V=-0.046+-0.005, U-B=-0.079+-0.017. => updated Q-method => E(B-V) = -0.018 (apparently unreddened given the photometric errors) => hence, (B-V)o = -0.046, (U-B)o = -0.079, E(B-V) = Av = 0.00. VanLeeuwen07 plx = 37.55+-0.16 mas => D = 26.6+-0.1 pc. The photometric distance (assuming the star is on the ZAMS) is ~23+-5 pc. Mv = 0.81 and delta(Mv) = -0.23 - hence close to the main sequence. Delta(V)=5.5 binary. So it looks like this this is now a B9.5, and most say dwarf. Teffs: 10162K(Erspamer03), 10580+-400K(Zorec09). # Exemplars 16 Dra A = HD 150100 = HR 6184 B9.5V: Slettebak63,Abt95 B9.5Vn: Cowley69 B9.5Vs: Abt85 All published types are B9.5V or variant. However, Burleigh & Barstow 2000 report a 29000-35000K white dwarf companion (indeed HD 150100 is one of the most massive stars now known to harbor a white dwarf companion), Holberg13 calls DA1.6(Teff=32000K). The companion is V ~ 17.0, while the primary is V=5.5 (it was detected in the UV). Also V=11.2 companion (unclear if physical or not) at 120", and CPM with 17 Dra. Also G=15.8 companion WD candidate at 11" found by Gentile Fusillo19. Teffs: 10271+-127K(Wu11). V=5.53(HIP), B-V=-0.060+-0.015(HIP), plx=7.64+-0.17mas(HIP), plx=7.7433+-0.0856mas(GaiaDR2) => D = 129.1+-1.4 pc. STILISM reddening map E(B-V) ~ 0.016, Av ~ 0.05 => (B-V)o = -0.060 - 0.016 = -0.076. Mv = -0.08. Teffs: 10271K(Wu11), 10568K(Zorec12,Stassun18) => = 10420K. HD 145631 *B9.5Va: GrayGarrison87 B9.5V: Bertiau58 B9.5Vn: Garrison67 B9V: Slettebak68, Houk88 Upper Sco member. Teffs: 10715K(deGeus89) # Other Stars Here I list entries from Skiff's catalog (2012 version) with 3 or more B9.5V classifications. HD 5789 = HR 283 1963ApJ...138..118S B9.5V 1969AJ.....74..375C B9.5Vn 1969AJ.....74.1082M B9.5V 1995ApJS...99..135A B9.5Vnn lambda Boo HD 42509 = HR 2193 1959ApJ...130..159O B9.5V 1969AJ.....74..375C B9.5VSi: 1972ApJ...175..453M B9.5V HD 108767 = HR 4757 A 1981ApJS...45..437A B9.5V 1983A&AS...51..143G B9.5V 2001A&A...378..116M B9.5V HD 139486 1958ApJ...128..533B B9.5V 1967ApJ...147.1003G B9.5V 1968ApJ...151.1043S B9.5V HD 158643 1969MNRAS.144...31B B9.5V 1992A&AS...95..535J B9.5Ve 1995ApJS...99..135A B9.5Vn Cl* NGC 7092 Ebb 26 1953ApJ...117..353J B9.5V 1956JO.....39..117W B9.5V 1976PASP...88..222A B9.5VSr