COMMISSION 27 OF THE I.A.U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 118 Konkoly Observatory Budapest 27 December 1965 PHOTOMETRIC LIGHT-CURVES OF SOUTHERN BV-STARS The given magnitudes and amplitudes of the variables have to be understood in connection with the magnitudes of the comparison stars. Because of the mean error of about 0.1 magnitudes for a single measurement a difference of this order in the depths of the primary and secondary minima cannot be discovered, therefore it may be necessary to double the period in some cases. BV 424 = CoD -65 2086 = HD 144 375 (F5) (Fig. 1) Min = JD 243 8228.285 +2d7095 . E, EB, Ampl. 0m6 ^1a Comparison stars: HD 144 403 (A0) 8m65 (mean values of Harvard and Cape catalogues) HD 144 560 (K2) 9m30 Individual minima (fainter than 9m40) Minima E O - C 243 8228.315 0 +0.030 8266.224 14 +0.006 8553.417 120 -0.008 [FIGURE 1] BV 445 = BD -10 3826(8m5) = HD 123 423 (F5) (Fig. 2) Min = JD 242 6087.505 +2d334 715 . E, EA, Ampl. 0m7 ^1b Comparison stars: HD 123 900 (F0) 9m1 (Data from Harvard catalogue) HD 123 286 (F8) 10m1 The light-curve has been derived using sky patrol plates of the bamberg Southern Station, covering a time-interval of 404 days = 173 epochs. In deriving the period, however, sky patrol plates from Bamberg have been used additionally. By means of these plates a total time-interval of 12 692 days = 5 479 epochs could be covered. The sky patrol plates of Bamberg have been estimated and minima are given in the following list: Minima E O - C 242 6087.481 0 -0.024 6505.452 179 +0.032 7182.516 469 +0.027 7483.639 598 -0.029 Photometric minima (fainter than 9m70) Minima E O - C 243 8475.501 5306 +0.002 8578.244 5350 +0.017 8779.403 5479 -0.003 BV 445 has been already published in Inf. Bull. on Var. Stars No. 62^1b. The period given there is wrong. [FIGURE 2] BV 458 = 1900: 6h7m54s -66 57.9 = HD 271 924 (A0) (Fig. 3) Max = JD 243 8379.425 +1d3338 . E, Cepheid, Ampl. 0m95 ^1c Comparison stars: a = Cape -66 495 9m4 (Value from the Cape catalogue) b = 10m6 estimated (Fig. 3, Ident.chart) Individual maxima (brighter than 9m95) Maxima E O - C 243 8379.453 0 +0.028 8707.526 246 -0.026 .572 246 +0.032 8739.506 270 -0.045 8798.279 314 +0.041 8810.272 323 +0.030 [FIGURE 3] BV 477 = CoD -77 608 (10m0) = Cape -77 905 (9m2) (Fig. 4) Min = JD 243 8494.410 + 2d1162 . E, AE, Ampl. 0m7 ^1c Comparison stars: Cape -78 822 9m0 (Data from Cape catalogue) Cape -77 604 10.0 Individual minima (fainter than 9m90) Minima E O - C 243 8494.403 0 -0.007 8547.287 25 -0.028 8583.247 42 -0.043 8877.447 181 +0.005 8911.292 197 -0.009 [FIGURE 4] BV 510 = CoD -55 5858 (10m3/4) = Cape -55 6204 (9m6) (Fig. 5) Min = JD 243 8205.310 +0d86 956 . E, EA, Ampl. 0m45 ^1d Comparison stars: Cape -55 6207 9m4 (Data from Cape catalogue) Cape -55 6203 10m1 Individual minima (fainter than 9m80) Minima E O - C 243 8205.284 0 -0.026 8524.438 367 0.000 8592.250 445 -0.013 8877.452 773 -0.027 8884.457 781 +0.022 [FIGURE 5] BV 526 = CoD -64 898 (9m0) = HD 132 461 (B9) (Fig. 6) Min = JD 243 8199.250 +6d460 . E, EB, Ampl. 0m3 ^1e Comparison stars: HD 131 782 (A3) 8m0 (mean values of Harvard and HD 132 023 (A2) 9m2 Cape catalogues) Individual minima (fainter than 9m0) Minima E O - C 243 8199.313 0 +0.063 8548.331 54 +0.239 8580.245 59 -0.147 .290 59 -0.102 8877.447 105 -0.105 .491 105 -0.061 8916.345 111 +0.033 .392 111 +0.080 [FIGURE 6] BV 556 = BD -16 4888 (8m3) = HD 170 097 (B9) (Fig. 7) Min = JD 234 8505.574 + 5d2747 . E, EW, Ampl. 0m6 ^1e Comparison stars: HD 170 604 (B3) 8m5 (Data from Harvard catalogue) HD 170 378 (B8) 9m4 Individual minima (fainter than 8m80) Minima E O - C 243 8505.574 0 +_0.000 8587.386 15.5 +0.054 [FIGURE 7] BV 577 = CoD -34 10981 (7m2) = HD 147 683 (B8) (Fig. 8) Min = JD 243 8230.250 + 1d7309 . E, EW, Ampl. 0m3 ^1f Comparison stars: HD 147 387 (F2) 7m20 estimated HD 146 745 (F2) 7.65 estimated In the Harvard catalogue as well as in the Cape catalogue the comparison star a is fainter than b in contrary to their values derived from sky patrol plates. Individual minima (fainter than 7m50) Minima E O - C 243 8230.265 0 +0.015 8499.406 155.5 +0.001 .428 155.5 +0.023 .514 155.5 +0.109 8505.485 159 +0.022 8551.376 185.5 +0.045 8557.374 189 -0.016 8577.290 200.5 -0.005 8584.292 204.5 +0.073 8590.294 208 +0.017 8610.209 219.5 +0.027 8616.212 223 -0.028 8885.452 378.5 +0.057 8911.384 393.5 +0.025 The period given in Inf. Bull. on Var. Stars No. 81^1f appears to be wrong as may be seen from new plate-material. A better light-curve result from the period of 1.7309d E. [FIGURE 8] BV 581 = CoD -54 7490 (8m9) = HD 161 337 (B8) (Fig. 9) Min = JD 243 8233.340 + 1d8744 . E, EW, Ampl. 0m5 ^1f Comparison stars: HD 157 624 (B8) 7m82 (Cousins' catalogue ^2) HD 157 943 (A0) 9m40 Individual minima (fainter than 9m80) Minima E O - C 243 8233.310 0 -0.030 8264.225 16.5 -0.038 8265.223 17 +0.018 8498.540 141.5 -0.028 8529.514 199 -0.030 8607.253 199.5 -0.030 .299 199.5 +0.016 8608.253 200 +0.033 8621.292 207 -0.049 8622.270 207.5 -0.008 8638.219 216 +0.009 BV 581 has been published without light-curve in Inf. Bull. on Var. Stars No. 81^1f. The period and classification there as the first communication has been changed. [FIGURE 9] REFERENCES COMMISSION 27 OF THE I.A.U. INFORMATION BULLETIN ON VARIABLE STARS 1a/ NUMBER 51, W. STROHMEIER, New Bright Variables. [IBVS 51] 1b/ NUMBER 62, W. STROHMEIER, R. KNIGGE, H. OTT, Bright Southern BV-Stars. [IBVS 62] 1c/ NUMBER 66, W. STROHMEIER, R. KNIGGE, H. OTT, Bright Southern BV-Stars. [IBVS 66] 1d/ NUMBER 70, W. STROHMEIER, R. KNIGGE, H. OTT, Bright Southern BV-Stars. [IBVS 70] 1e/ NUMBER 74, W. STROHMEIER, R. KNIGGE, H. OTT, Bright Southern BV-Stars. [IBVS 74] 1f/ NUMBER 81, W. STROHMEIER, R. KNIGGE, H. OTT, Bright Southern BV-Stars.[IBVS 81] 2/ Royal Observatory Bulletins, NUMBER 64, A. W. J. COUSINS and R. H. STOY, Photoelectric Magnitudes and Colours of Southern Stars. [BIBCODE 1963pmcs.book.....C ] December 1965 E. SCHOFFEL Remeis Observatory Bamberg