COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 476 Konkoly Observatory Budapest 1970 October 26 Veroffentlichungen der Remeis-Sternwarte Bamberg Astronomisches Institut der Universitat Erlangen-Nurnberg Band VIII, Nr.91 PERIOD-CONTROL FOR ECLIPSING BINARIES BV 1161, 1162, 1209 and 1214 By the help of the Harvard plate material which was in a friendly manner at our disposal we were able to control the periods back to 1901. First this plate material (all minima estimated by D. FRIEDRICH, Bamberg, 1970) makes possible the derivation of the elements. BV 1161 = CAP -56 8436 (9m.0) = HD 161 160 (A0) Elements from IBVS 289, 1968, but with the halt of the period given there: Min = JD 242 8686.375 + 1.554 965d. E Minima E O - C Minima E O - C 241 5117.823 -8726 +0.073 241 9589.733 -5850 -0.097 5198.671 -8674 +0.063 9695.537 -5782 -0.030 5226.533 -8656 -0.065 9897.706 -5652 -0.007 5646.536 -8486 +0.098 9925.785 -5634 +0.083 6296.507 -7968 +0.093 9978.655 -5600 +0.084 6302.664 -7964 +0.030 242 0034.577 -5564 +0,027 6563.768 -7796 -0.100 0037.613 -5562 -0.047 6697.570 -7710 -0.025 0295.814 -5396 +0.030 6933.844 -7558 -0.106 0348.623 -5362 -0.030 7039.568 -7490 -0.119 .680 -5362 +0.027 7297.847 -7324 +0.036 0373.622 -5346 +0.090 7325.760 -7306 -0.041 0429.537 -5310 +0.026 7353.833 -7288 +0.043 0609.808 -5194 -0.079 7378.714 -7272 +0.044 0651.844 -5167 -0.027 8034.812 -6850 -0.053 0662.737 -5160 -0.019 8115.646 -6798 -0.077 0690.701 -5142 -0.044 .713 -6798 -0.010 1007.835 -4938 -0.123 8404.871 -6612 -0.075 1135.485 -4856 +0.020 8451.707 -6582 +0.112 .533 -4856 +0.068 8824.790 -6342 +0.003 1368.734 -4706 +0.024 9180.805 -6113 -0.069 1396.656 -4688 +0.043 9558.763 -5870 +0.033 1421.627 -4672 +0.049 242 1424.589 -4670 -0.099 242 8378.428 - 198 -0.064 1449.538 -4654 -0.030 8456.256 - 148 +0.005 .586 -4654 +0.018 8742.321 + 36 -0.033 1452.579 -4652 -0.099 8745.409 + 38 -0.055 2133.646 -4214 -0.106 8770.239 54 -0.104 2525.550 -3962 -0.054 9140.361 292 -0.064 3237.638 -3504 -0.140 9168.307 310 -0.107 .680 -3504 -0.098 9818.353 728 -0.037 3576.716 -3286 -0.044 9821.390 730 -0.109 3918.784 -3066 -0.068 9874.294 764 -0.074 4024.576 -2998 -0.014 A secondary minimum is suspected; Ampl. 0.80m. No well-founded change in the period between 1900 and 1967. BV 1162 = CAP -64 3890 (10.0m) Elements from IBVS 289, 1968, but the period has been slightly corrected: Min = JD 242 8332.225 + 5.730 685d. E Minima E O - C Minima E O - C 241 5575.709 -2226 -0.011 242 3191.709 -897 -0.091 6022.561 -2148 -0.153 3237.680 -889 +0.034 6045.526 -2144 -0.110 3318.538 -875 +0.662 6297.652 -2100 -0.134 3535.741 -837 +0.099 7065.624 -1966 -0.074 4045.515 -748 -0.158 7718.727 -1852 -0.269 4074.517 -743 +0.191 8033.891 -1797 -0.293 4326.697 -699 +0.221 8102.776 -1785 -0.176 4704.628 -633 -0.063 8538.509 -1709 +0.025 8034.295 - 52 +0.066 8561.516 -1705 +0.109 8756.293 + 74 -0.003 9569.782 -1529 -0.226 8819.310 + 85 -0.023 9575.692 -1528 -0.046 9134.468 140 -0.053 242 0337.710 -1395 -0.209 9140.361 141 +0.110 0343.671 -1394 +0.021 9501.376 204 +0.091 0372.551 -1389 +0.247 9547.376 212 +0.246 0429.537 -1379 -0.073 9822.479 260 +0.276 1065.627 -1268 -0.089 9839.415 263 +0.020 2584.487 -1003 +0.139 243 0177.436 322 -0.069 A secondary minimum is suspected; Ampl. 0.55m. No well-founded change in the period between 1901 and 1967. BV 1209 = CAP -69 1617 (8.3m) = HD 104 191 (A0) Elements from IBVS 330, 1969, but the period has been slightly corrected: Min = JD 243 4315.550 + 3.247 610d.E Minima E O - C Minima E O - C 241 5547.618 -5779 +0.006 242 1331.585 -3998 -0.020 6190.633 -5581 -0.005 1685.621 -3889 +0.026 8093.736 -4995 -0.002 1724.577 -3877 +0.011 8694.460 -4810 -0.086 8710.211 -1723 +0.036 9509.675 -4559 -0.012 9382.482 -1519 +0.052 242 0295.631 -4317 +0.013 9421.372 -1507 -0.030 Ampl. 0.60m, without remarkable secondary minimum, EA. No Well-founded change in the period between 1901 and 1968. BV 1214 = CAP -50 8564 (9.7m) = CoD -50 9816 (10m) Minima E O - C Minima E O - C 241 5870.755 -770 +0.550 242 0754.495 -460 -0.845 5885.629 -769 -0.335 0959.774 -447 -0.426 5933.640 -766 +0.401 0960.701 -447 +0.501 6264.669 -745 +0.501 0991.726 -445 +0.008 6279.759 -744 -0.167 1006.763 -444 -0.713 6563.768 -726 +0.189 1007.675 -444 +0.199 6578.835 -725 -0.503 1370.709 -421 +0.782 6633.664 -721.5 -0.828 1400.623 -419 -0.815 6691.523 -718 +0.876 1716.711 -399 +0.103 7035.624 -696 -0.710 1731.676 -398 -0.691 7068.588 -694 +0.737 1732.663 -398 +0.296 8123.575 -627 +0.095 2141.592 -372 -0.496 8455.533 -625 +0.345 2142.600 -372 +0.512 .602 -625 +0.414 2456.719 -352 -0.539 8501.544 -603 -0.330 3221.598 -303.5 +0.053 8533.511 -601 +0.119 3229.597 -303 +0.173 8833.558 -582 +0.755 3269.513 -300.5 +0.695 8911.533 -577 -0.063 3575.722 -300 -0.978 9226.550 -557 -0.216 4678.694 -211 -0.512 9242.535 -556 +0.011 5419.349 -164 -0.507 9557.717 -536 +0.023 8019.225 + 1 -0.783 9605.580 -533 +0.610 .292 + 1 -0.716 9903.694 -514 -0.687 8035.230 2 -0.537 242 0313.572 -488 -0.530 8240.587 + 15 -0.040 0314.623 -488 -0.521 8366.356 23 -0.340 0346.575 -486 +0.956 8397.225 25 -0.987 0392.528 -483 -0.366 8429.238 27 -0.492 0612.847 -469 -0.667 8602.584 38 -0.489 0613.749 -469 +0.235 9501.245 95 -0.063 0724.563 -462 +0.740 .344 95 +0.036 0747.474 -460.5 +0.023 The CAP and CoD numbers published in IBVS 330, 1969 are wrong; they belong to a neighbouring star. Elements from IBVS 330, but the period has been slightly corrected: Min = JD 242 8004.250 + 15.7585d. E Ampl. 0.30m, with very deep secondary minimum, EA or EB No well-founded change in the period between 1902 and 1968. Remeis-Observatory Bamberg 1970 October 15 W. STROHMEIER