A7III
tet^2 Tau is the best A7III standard, and should probably be
considered an anchor standard.
tet^2 Tau is the best A7III standard accessible from the south: J0428+1552
MK43 standard: gam Boo - A7III
JM53 standards: tet^2 Tau - A7III
gam Boo - A7III
Morgan71 standard: tet^2 Tau (=HR 1412) - A7IIIA
MorganAbt72 standards: tet^2 Tau (=HR 1412) - A7III
MK73 dagger standard: tet^2 Tau (=HR 1412) - A7III
Cowley76 standard: gam Boo - A7III
Houk standard: tet^2 Tau (=HR 1412) - A7III
MK78 standard: tet^2 Tau (=HR 1412) - A7III
HR 4369 - A7:III:kn Sr II
GrayGarrison89 standard: tet^2 Tau (=HR 1412) - A7III(low vsini)
GrayCorbally10 standard: tet^2 Tau (=HR 1412) - A7III(low vsini)
(J-H)(A7III) = 0.055 ; smoothed relation from giants in Skiff compnedium w/i 15 deg of NGP, 2MASS photometry AAA flags
=> adopt (J-H)(A7III) = 0.055
(H-Ks)(A7III) = 0.040 ; smoothed relation from giants in Skiff compnedium w/i 15 deg of NGP, 2MASS photometry AAA flags
=> adopt (H-Ks)(A7III) = 0.040
# No standards
GrayGarrison89 and GrayCorbally10 list a low vsini A7III standard, but
no high vsini A7IIIn standard. While Garrison94 does not list a A7III anchor
star (indeed any anchors with temperature types between A3 and F0), it appears
that tet^2 Tau (=HR 1412) should qualify as an A7III anchor.
# Primary standard
theta^2 Tau = HR 1412 (J0428+1552; V=3.4)
*A7III: Adams35,JM53,Jaschek64(most),MorganAbt72,MK73(dagger),MK78,Ortega83,Gray89,GrayGarrison89(low vsini stan.),Gray01,GrayNstars,GrayCorbally10
A7V: Maury1897
F0III: Bertaud67
F0: Cannon
SB? SMARTS 1.5-m spectra in hand (26Ia blue, 47Ib red).
# Weak standard
gam Boo = HD 127762 = HR 5435 (J1432+3818; V=3.0)
A7III: MK43,Cowley76(standard),Abt81
A7IIIn: Palmer68
A7IV+(n): Gray01
A7IV+: GrayGarrison89
A7III-IV: Abt95
A5V: Adams35,Bouw81
Generally good agreement on "A7" temperature type due to use in
MK43. However GrayGarrison89 and Gray01 consider the star to be
"IV+" luminosity class. I've decided to list this star as a
candidate "A7IV+" standard.