An Absolute Spectrophotometric Calibration of the Energy Distribution of Twelve Standard Stars

Energy distributions of a Lyr, K Aql, 58 Aql, E Aqr, 29 Psc, Cet, e Ori, Gem, Hya, a Leo, 6 Crt, and 0 Vir have been calibrated with two Phillips standard4amps having a tungsten-ribbon filament which were calibrated in Heidelberg in 1958 and 1966. The observations were made with a reflection-grating photoelectric spQctrum scanner on the 36-inch Crossley reflector of Lick Observatory and cover the range 3200-10570 A The bandpasses were 45 A from 3200 to 5556 A and 30 A from 5556 to 10870 A. The results for the twelve stars are tabulated as - 2.5 log F(l/x)/F(1/ 0), where o = 5556 A, The statistical errors are +3 percent from 3200 to 3800 A, + 1 percent from 4000 to 5000 A, + 3 percent from 5000 to 7000 A, and +2 percent from 7000 to 10870 A.