COMMISSION 27 OF THE I.A.U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 91 Konkoly Observatory Budapest 30 April 1965 PHOTOMETRIC LIGHT-CURVES OF SOUTHERN BV-STARS BV 421 = Cape -85deg 55 (Fig.1) Comparison-stars: Cape -85deg 65 9m.3 Cape -85deg 60 9m.7 Magnitudes of comparison-stars have been derived by photometric connexion to stars (HD 94 009 G5; HD 89 499 G5) from the catalogue of COUSINS and STOY [1]. Min = JD 243 8315.787 + 1d.14926, E,EW, Ampl. 0m.4 The photometric derivation of the light-curve proved BV 421 to be an eclipsing binary in contrary to its publication as RRc in Inf. Bull. on Var. Stars, No. 54 [2]. The period given there had to be doubled. Individual minima (fainter than 9m.7) Minima E O - C JD 243 8316.323 0.5 - 0d.039 8374.356 51 - 0.043 .401 51 + 0.002 8408.324 80.5 + 0.022 8427.279 97 + 0.014 8435.314 104 + 0.004 8439.312 107.5 - 0.020 .356 107.5 + 0.024 8440.449 108.5 - 0.033 8443.353 111 - 0.002 .398 111 + 0.043 [FIGURE 1] BV 423 = HD 1372 (F2) (Fig.2) Comparison-stars: HD 1024 (F5) 9m.8 HD 1446 (GO) 10m.6 Min = JD 243 8257.540 + 0d.59480. E,EW, RRc?, Ampl. 0m.4 The light-curve shows that BV 423 is probably an eclipsing binary of type EW, however, the possibility of BV 423 being an RRc-type pulsation variable can not be excluded. The period now derived is nearly twice the period given in Inf. Bull. on Var. Stars, No. 54 [2]. The light-curve shows more scattering than usually, since BV 423 is very near to the edge of the photographic plates used. Individual minima (fainter than 10m.85) Minima E O - C JD 243 8257.502 0 - 0d.043 8263.490 10 - 0.002 8297.364 67 - 0.028 8309.322 87 + 0.034 8314.322 95.5 - 0.011 .367 95.5 + 0.024 8339.293 137.5 - 0.032 8641.497 645.5 + 0.014 8695.294 736 - 0.019 .340 736 + 0.027 8701.258 746 - 0.003 BV 426 = HD 131 356 (G5) (Fig.3) Comparison-stars: HD 130 635 (A2) 8m.45 (mean values of Harvard and Cape HD 130 210 (A3) 9m.2 catalogues) Max = JD 243 8207.0 + 36d.9 . E, C-delta, Ampl, 0m.4 [FIGURE 2] [FIGURE 3] The period in Inf. Bull. on Var. Stars, No. 54 [2], had to be shortened by one day. Individual maxima (brighter than 8m.75) Maxima E O - C JD 243 8205.284 0 - 1d.716 6.277 0 - 0.723 8502.485 8 + 0.035 3.485 8 + 1.035 BV 429 = HD 136 483 (G0) (Fig.4) Comparison stars: HD 136 146 (A5) 8m.95 HD 133 815 (A2) 9m.45 Magnitudes of comparison-stars have been derived by photometric connexion to stars (HD 131 099 A2; HD 134 288 F0) from the catalogue of COUSINS and STOY [1]. Max = JD 243 8197.3 + 16.73. E. C-delta, Ampl. 0m.4 The period given in Inf. Bull. on Var. Stars, No. 55 [2], had to be shortened by one day. Individual maxima (brighter than 9m.2) Maxima E O - C JD 243 8196.330 0 - 0d.970 8498.495 18 + 0.055 8548.331 21 - 0.299 8581.245 23 - 0.845 2.245 23 + 0.155 3.247 23 + 1.157 [FIGURE 4] BV 523 = HD 130 233 (F8) (Fig.5) Comparison-stars: HD 130 042 (K0) 8m.10 HD 129 496 (F8) 9m.25 Magnitudes of comparison-stars have been derived by photometric connexion to stars (HD 123 151 K0; HD 125 833 K0) from the catalogue of COUSINS and STOY [1]. Preliminary elements had been published in Inf. Bull. on Var. Stars, No 74 [2]. Max = JD 243 8206.05 + 3d.0651 . E, C-delta, Ampl. 0m.5 Individual maxima (brighter than 8m.10) Maxima E O - C JD 243 8206.278 0 + 0d.228 8230.220 8 - 0.351 8475.556 88 - 0.223 8494.495 94 - 0.326 8500.488 96 + 0.188 8549.335 112 - 0.006 8555.333 114 - 0.138 8561.336 116 - 0.266 8580.248 122 + 0.256 8583.250 123 + 0.193 8586.252 124 + 0.130 8589.254 125 + 0.068 8592.250 126 - 0.003 8604.210 130 - 0.303 [FIGURE 5] BV 601 = CoD -39deg 14830 (Fig.6) Comparison-stars: CoD -40deg 14 903 10m.45 CoD -39deg 14 831 10m.77 Magnitudes of comparison-stars have been derived by photometric connexion to stars (HD 213 628 G0, HD 213 657 F5) from the catalogue of COUSINS and STOY [1]. Max = JD 243 8260.438 + 0d.34741, E, RR, Ampl. 0m.25 BV 601 has been published first without light-curve in Inf. Bull. on Var. Stars, No. 81 [2]. The period given there is wrong. Individual maxima (brighter than 10m.5) Maxima E O - C JD 243 8260.472 0 + 0d.034 8315.327 158 - 0.002 8338.246 224 - 0.012 8615.486 1022 + 0.005 8692.296 1243 + 0.027 8708.259 1289 + 0.010 BV 612 = BD -21deg 5657 (Fig.7) Comparison-stars: a = Cape -21deg 7603 10m.0 b = see figure 10m.5 (estimated) The elements of BV 612 have been communicated already in Inf. Bull. on Var. Stars, No. 86 [2] Min = JD 243 8252.290 + 6d.03145, E, EA, Ampl. 0m.7 [FIGURE 6] [FIGURE 7] [FIGURE 7b] [FIGURE 8] Individual minima (fainter than 10m.4) Minima E O - C JD 243 8252.369 0 + 0d.079 8258.367 1 + 0.045 8264.362 2 + 0.009 8638.312 64 + 0.006 8650.273 66 - 0.096 BV 613 = HD 198 103 (A3) (Fig.8) Comparison-stars: Cape -34deg 8793 8m.2 Cape -34deg 8797 8m.6 The elements of BV 613 have been communicated already in Inf. Bull. on Var. Stars, No. 86 [2]. Min = JD 243 8295.265 + 4d.4358. E,EA, Ampl. 0m.3 Individual minima (fainter than 8m.6) Minima E O - C JD 243 8295.270 0 + 0d.005 8583.522 65 - 0.070 8641.362 78 + 0.105 8672.244 85 - 0.064 [1] Royal Observatory Bulletins, No. 64, A.W.J. COUSINS and R.H. STOY, Photoelectric Magnitudes and Colours of Southern Stars. [BIBCODE 1963pmcs.book.....C ] [2] Publications of W. STROHMEIER, R. KNIGGE and H. OTT. [BIBCODE 1965IBVS...86....1S ] Bamberg, 14 April 1965 U. KOHLER, E. SCHOFFEL Remeis-Observatory