Data sources:

AA: V.P.Goranskij and E.A.Karitskaya with the 1-m Zeiss telescope of Tien-Shan Observatory and Kornolov's four-channell WBVR photoelectric photometer.
ShV: V.P.Goranskij with the SAI Crimean Station 125-cm and 60-cm telescopes and Shugarov-Volkov's UBV photoelectric photometer.
DD: R.A.Downes and H.W.Duerbeck, Astron. J. V.120, p.2007, 2000
C7: V.P.Goranskij, S.Yu.Shugarov and E.A.Barsukova with SAI Crimea Station 125-cm and 60-cm telescopes and SBIG ST-7 CCD.
Others. GH: G. Hickel, VSO: VSOLJ data.