Table 5 from Struve (1946) Radial Velocity Measurements of WW Cygni Plate Date UT Phase Velocities(km/s) G f/2 days period all lines Ca II 6838 Oct. 27 1:29 0.545 0.164 -23.4 -6.9 6856 28 1:25 1.542 0.465 +21.5 +0.7 6874 29 1:09 2.531 0.763 +80.2 +0.7 6875 29 1:40 2.552 0.769 +75.7 +8.3 6896 30 1:09 0.213 0.064 -23.8 -7.1 6897 30 1:40 0.234 0.075 -27.8 -7.1 6909 31 1:13 1.216 0.367 -62.3 -25.5 6910 31 1:46 1.239 0.373 -59.2 -10.2 6928 Nov. 1 1:07 2.212 0.667 +42.1 -10.3 6946 2 1:08 3.212 0.968 +74.8 - 6947 2 1:44 3.237 0.976 +70.0 - 6948 2 2:38 3.275 0.987 +50.2 - 6949 2 3:44 0.003 0.001 -16.5 - 6950 2 4:30 0.035 0.011 -19.3 - 6964 3 1:20 0.903 0.273 -70.9 -25.6 6980 4 1:28 1.908 0.576 +5.0 +0.1 7000 5 1:03 2.891 0.873 +58.9 +3.9 7012 6 2:42 0.642 0.194 -47.9 -3.8 7029 7 0:58 1.570 0.474 +11.1 -14.4 7030 7 1:28 1.591 0.480 -20.3 +0.1 7051 8 1:09 2.578 0.778 +78.2 +15.4 7061 9 1:06 0.258 0.078 -21.8 -3.7 7068 10 1:14 1.263 0.381 -23.9 -29.7 7088p 11 3:13 2.346 0.707 +37.6 +15.2 7097 13 0:56 0.933 0.281 -65.6 -14.5 7119 14 0:48 1.927 0.581 +9.9 +7.6 7120 14 1:14 1.945 0.586 +34.9 -3.8 7158 16 1:12 0.627 0.189 -57.1 -10.6 7159 16 1:38 0.645 0.194 -60.6 -14.5 7203 19 1:53 0.337 0.102 -36.2 - 7204 19 2:25 0.360 0.109 -21.2 -7.6 7242 21 0:43 2.289 0.690 +71.9 +11.7 7243 21 1:12 2.309 0.696 +57.7 +15.5 7279 23 0:52 0.977 0.294 -59.2 -21.7 7280 23 1:26 1.001 0.302 -53.7 -7.3 7334 26 0:50 0.659 0.199 -43.8 -25.5 7335 26 1:18 0.678 0.204 -42.0 -14.2