COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 77 Konkoly Observatory Budapest 2 January 1965 PHOTOMETRIC LIGHT-CURVES OF BRIGHT SOUTHERN BV-STARS ECLIPSING BINARIES General remarks: The light-curves are derived from sky patrol plates of Bamberg Southern Station. The exposure time of these plates is one hour, and decreasing sensibility of the photographic plates during this time causes distortion of the light-curves of short period variables especially near minima (e. g. see light-curve of BV 419 fig. 2). Another effect of long exposure time is the small depth of minima of short period variables. The amplitude of BV 419 for instance should be larger than 0m.3. All Julian Dates are heliocentric mid-exposure times of the sky patrol plates. BV 418 = HD 156 545 (A_0) (Fig. 1) Min = JD 243 8196.413 + 2d.3129. E. EA, Ampl. 1m.5 Comparison - stars HD 158 081 (A_0) 8m.1 HD 156 922 (G_5) 9m.6 The period, derived by W. STROHMEIER (1a/), could be improved by including new plate material and had to be slightly shortened. [FIGURE 1] [FIGURE 2] Individual minima (fainter than 9m.6) Minima E O - C JD 243 8196.448 0 + 0d.013 8254.276 25 + 0.040 8529.472 144 + 0.001 .517 144 + 0.046 8580.340 166 - 0.014 .386 166 + 0.032 8587.344 169 + 0.051 8638.219 191 + 0.042 BV 419 = HD 159 441 (A_3) (Fig. 2) Min = JD 243 8196.392 + 0d.47836. E. EW, Ampl. 0m.3 Comparison - stars HD 158 852 (A_0) 7m.35 (mean values of Harvard and Cape HD 159 772 (B_9) 8m.05 catalogues) The period of 0d.47836 is 3/4 of the period estimated by W. STROHMEIER (1b/). Individual minima (fainter than 7m.75) Minima E O - C Minima E O - C JD 243 8196.395 0 +0d.005 JD 243 8277.225 169 -0d.010 8224.363 58.5 +0.014 8498.482 631.5 +0.006 8230.368 71 +0.012 8501.573 638 -0.013 8236.322 83.5 -0.013 8549.423 738 +0.001 8254.277 121 +0.003 8555.421 750 +0.020 8255.233 123 +0.003 8580.424 761 0.000 8280.272 133.5 +0.021 8561.381 763 0.000 8261.225 135.5 +0.015 8583.385 809 0.000 8266.226 146 -0.007 8584.340 811 -0.002 .272 146 +0.039 8585.299 813 +0.001 [FIGURE 3] [FIGURE 4] BV 420 = HD 161 783 (B_3) (Fig. 3) Min = JD 243 8230.519 + 1d.58437. E. EA, Ampl. 0m.5 (1b/) Comparison - stars HD 167 128 (B_5) 5m.50 (by photometric connexion to stars from HD 161 917 (A_0) 6m.15 COUSINS' catalogue (2/)) Individual minima (fainter than 5m.75) Minima E O - C JD 243 8235.330 3 +0d.058 8254.278 15 -0.007 8585.386 224 +0.032 8620.274 246 0.000 8636.211 256 +0.093 BV 430 = HD 75 747 (A_5) (Fig. 4) Min = JD 243 8380.515 + 1d.66992. E. EA, Ampl. 0m.4 Comparison - stars HD 75 416 (B_9) 5m.36 HD 72 922 (K_0) 6m.70 (COUSINS' catalogue (2/)) The period, estimated by W. STROHMEIER (1c/), had to be slightly shortened. A. W. J. COUSINS was so kind to communicate his photoelectric measurements to W. STROHMEIER. These measurements are from 1960 and have been very useful in improving the period. [FIGURE 5] [FIGURE 6] Individual minima (fainter than 6m.55) Minima E O - C JD 243 8380.537 0 +0d.013 8385.542 3 +0.008 8406.412 15.5 +0.005 8442.353 37 +0.020 8472.333 55 -0.037 8493.232 67.5 -0.012 8503.263 73.5 -0.001 BV 444 = HD 122 314 (A_5) (Fig. 5) Min = JD 243 8229.200 + 3d.2571. E. EA. Ampl. 0m.35 (1d/) Comparison - stars HD 121 810 (B_9) 8m.10 (mean values of Harvard and Cape catalogues) HD 122 131 (F_0) 8m.70 The magnitudes of the comparison - stars, used in photometry of BV 444, have little accuracy because of the largely differing values in the Harvard and Cape catalogues. The amplitude of 0m.35 derived for BV 444 therefore should be understood in connection with a difference of 0m.60 between both comparison - stars. Individual minima (fainter than 8m.70) Minima E O - C JD 243 8229.216 0 +0d.016 8473.467 75 -0.015 .512 75 +0.029 8499.488 83 -0.052 8548.331 98 -0.065 8584.202 109 -0.022 .247 109 +0.047 BV 513 = HD 117 470 (A_0) (Fig. 6) Min = JD 243 8190.253 + 0d.424274. E. EB, Ampl. 0m.3 (1e/) Comparison - stars HD 118 014 (A_0) 8m.3 (mean values of Harvard and Cape catalogues) HD 117 785 (A_2) 8m.8 [FIGURE 7] [FIGURE 8] Individual minima (fainter than 8m.70) Minima E O - C JD 243 8190.263 0 +0d.010 8443.533 597 -0.012 8554.286 858 +0.006 8557.245 865 -0.005 8577.201 912 -0.010 BV 516 = HD 114 195 (B_9) (Fig. 7) Min = JD 243 8524.410 + 1d.49008. E. EB, Ampl, 0m.65 (1e/ 3/) Comparison - stars HD 123 515 (B_9) 5m.93 (COUSINS' catalogue (2/)) HD 121 336 (A_2) 6m.72 (by photometric connexion to stars from COUSINS' catalogue) As in the case of BV 430, the photoelectric measurements (1953-1956) by A. W. J. COUSINS have been very useful in improving the period. Individual minima (fainter than 7m.10) Minima E O - C JD 243 8524.393 0 -0d.017 8530.340 4 -0.029 8548.291 16 +0.044 BV 544 = HD 151 676 (A_3) (Fig. 8) Min = JD 242 5827.455 + 0d.661436. E. EB, Ampl. 0m.7 (1e/) Comparison - stars HD 151 527 (A_0) 6m.12 HD 151 884 (B_8) 6m.91 The light-curve has been derived using sky patrol plates of the Bamberg Southern Station, covering a time-interval of 85 days = 128 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 12 756 days = 19 285 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 JD 242 5827.413 (1/2) 0 -0d.042 6886.451 1601 +0.037 7159.618 2014 +0.031 7212.507 2094 +0.005 7597.450 2676 -0.008 JD 243 7072.538 17001 +0.010 7076.511 17007 +0.014 7078.499 17010 +0.018 7080.455 17013 -0.011 .499 17013 +0.033 Photometric minima (fainter than 6m.70) Minima E O - C JD 243 8502.535 19163 -0.018 .558 19163 +0.005 .575 19163 +0.022 8557.424 19246 -0.028 8583.257 19285 +0.009 REFERENCES COMMISSION 27 OF THE I.A.U. INFORMATION BULLETIN ON VARIABLE STARS 1a/ NUMBER 47, W. STROHMEIER, First Results from the Bamberg South-African Station. [IBVS No. 47] 1b/ NUMBER 49, W. STROHMEIER, Results from the Bamberg South-African Station II. [IBVS No. 49] 1c/ NUMBER 55, W. STROHMEIER, Bright Southern BV - Stars. [IBVS No. 55] 1d/ NUMBER 62, W. STROHMEIER, R. KNIGGE, H. OTT, Bright Southern BV - Stars. [IBVS No. 62] 1e/ NUMBER 74, W. STROHMEIER, R. KNIGGE, H. OTT, Bright Southern BV - Stars. [IBVS No. 74] 2/ Royal Observatory Bulletins, NUMBER 64, A. W. J. COUSINS and R. H. STOY, Photoelectric Magnitudes and Colours of Southern Stars. [BIBCODE 1962RGOB...64..103C ] 3/ Supplement to the General Catalogue of Variable Stars MOSCOW 1960, p. 213 and p. 218. E. SCHOFFEL, U. KOHLER Remeis - Observatory Bamberg