COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 749 Konkoly Observatory Budapest 1972 December 30 HBV 479 - 495, VARIABLES IN A FIELD AROUND S A 18 The archive of the Lippert Astrograph contains about 150 plates of a variable star field centered on SA 18 and mainly taken in the Julian date interval 2429400-2432100. Due to other circumstances these plates neither have been searched for variables nor recent data plates gained. Processing this material 17 new variables were discovered. Four of them turned out to be rediscovered already suspected variables listed in the CSV catalogs I and II. Nevertheless they were given HBV numbers, since nothing except a confirmation of variability was known about these stars. The results are summarized in the first table. The given accurate (1900) positions depend on measures of two sets of AGK3 reference stars, paired and crossed around each variable. Estimates of the variables were made by Pickerings method, using a Zeiss binocular microscope with continuously zoom lens magnification. The used sequences were measured on the Becker iris-diaphragm photometer and calibrated by standard B-magnitudes of the open cluster NGC 7160 and photographic magnitudes of SA 18. Table 2. As far as the 8 eclipsing variables are concerned nearby minima were combined into normal minima as given under n in table 3, which table also contains the epoch number and the O-C as derived from the respective elements in table 1. For three Mira type and one RR Lyrae variables a similar table is given which presents individual Table I. Summary of data ------------------------------------------------------------------------------------------------------ HBV alpha_1900 delta_1900 Type Max MinI MinII E_0 P D or epsilon 2430000 Sp. ------------------------------------------------------------------------------------------------------ 479 20h42m 3.96s +62d 8'40.6" EB 12.60m 15.02m 12.84m 0517.339 3.3128065d 0.18P 480 43 14.09 60 21 15.7 EB 12.16 12.57 12.20 0639.300 0.7763644 481 21 3 52.14 63 20 21.7 M 13.7 [16.0 0662 181.5 482 7 45.59 57 18 35.7 EB 11.42 12.61 11.69 0729.280 1.2358073. 0.20: 483 17 14.82 61 17 0.8 RCB 13.7 15.8 484 17 15.60 60 18 0.8 RA 13.66 15.02 13.79 0517.465 0.6930642 0.16 485 22 49.9.7 60 47 30.2 M 14.5 [15.7 0322 285.7 486 28 0.23 61 16 23.7 J 11.2 11.7 K5d: 487 28 12.12 60 40 52.3 RR 14.98 15.94 0576.474 0.4306951 0.20 488 28 20.66 63 34 10.2 EA 14.72 [15.8 0590.650 3.2655017 0.17 489 29 16.98 61 32 9.9 EA 11.80 12.63 490 30 17.26 57 21 36.2 RR? 14.60 15.36 491 32 32.63 60 27 25.3 J 12.5 13.3 492 39 43.24 63 34 41.8 EA 15.36 16.08 0515.399 9.7181902 0.14 493 40 5.65 63 26 8.6 EA 14.84 15.81 14.89 0914.386 1.4019731 0.16 494 55 4.51 62 41 22.3 M 13.6 [16.3 0372 374 495 56 3.23 62 63 6.8 EA 13.86 14.19 0693.586 1.9479836 0.17 ----------------------------------------------------------------------------------------------------- maxima (table 4). Normal points of mean light curves for each of the 8 eclipsing and 1 RR variables are listed in table 5 (see also figure). Additional notes on individual variables follow. The identification charts mark the variable and the used sequence stars. North is at top and East to the left. The scale is given by the length of the 5' line. Table 2. Photographic Magnitudes of the Sequences ------------------------------------------------------------- HBV a b c d e f g h ------------------------------------------------------------- 479 12.77m 12.54m 12.78m 13.40m 13.90m 14.20m 14.47m 480 11.91 12.17 12.43 12.62 12.88 481 13.50 13.75 14.13 14.41 14.99 15.27 15.53 15.97: 482 11.15 11.40 11.71 12.02 12.51 12.86 483 13.28 13.74 14.35 14.81 15.04 15.48 15.83 484 13.19 13.69 14.03 14.29 14.53 14.68 14.95 15.16 485 14.30 14.59 14.83 14.99 15.23 15.43 15.68 486 10.97 11.27 11.44 11.54 11.71 487 14.71 15.00 15.23 15.44 15.78 15.99 488 14.37 14.65 14.99 15.21 15.50 15.68 15.81 16.02: 489 11.57 11.90 12.27 12.54 12.73 490 14.55 14.77 14.95 15.12 15.36 15.60 491 12.25 12.71 12.86 13.20 13.34 13.82 492 15.10 15.39 15.57 15.82 15.9d 16.18 493 14.50 14.82 15.11 15.31 15.64 15.95 494 13.40 13.70 13.95 14.36 14.85 15.21 15.81 16.30: 495 13.55 13.88 14.17 14.66 ------------------------------------------------------------- Table 3 Normal Minima of 8 Eclipsing Stars --------------------------------------------------------------------- HBV 479 n E O-C HBV 488 n E O-C --------------------------------------------------------------------- 2429407.540 1 - 335 -0.009d 2428337.468 2 - 690 +0.014d 2430517.345 4 0 + .006 9457.533 3 - 347 + .012 1077.195 2 + 169 - .008 2430590.626 5 0 - .024 1028.268 3 + 134 + .041 --------------------------------------------------------------------- HBV 480 HBV 492 2429514.350 2 -1449 +0.002 2429407.515 3 - 114 -0.010 2430021.310 2 - 796 - .004 2430515.482 2 0 + .083 0639.300 5 0 .000 1030.433 1 + 53 - .030 1028.258 4 + 501 - .001 --------------------------------------------------------------------- HBV 482 HBV 493 2429660.310 1 - 865 0.000 2428421.375 1 -1821 -0.018 2430515.491 3 - 173 + .005 2430639.322 2 - 239 + 008 0729.279 3 0 - .001 0974.385 2 0 - .001 1028.346 2 + 242 + .002 1061.306 3 + 62 - .002 2066.420 1 +1082 .000 --------------------------------------------------------------------- HBV 484 HBV 495 2428422.331 1 -3023 -0.001 2429372.633 2 - 678 -0.020 9397.474 3 -1616 + .001 2430021.341 2 - 345 + .009 2430517.465 2 0 .000 0693.367 2 0 - .019 1030.333 1 + 740 .000 1028.468 3 + 172 + .029 2066.463 2 +2235 - .001 --------------------------------------------------------------------- Table 4 Individual Maxima of M and RR Lyr Variables --------------------------------------------------------------- HBV 481 (M)m_pg E O-C HBV 487 RR, --------------------------------------------------------------- 242 8310: 14.4m: -13 + 8d 243 0021.303 -1289 -0.004d 9397: 14.4: - 7 + 5 0307.297 - 625 + .008 9580 14.4 - 6 + 7 0366.294 - 488 .000 2430285 14.0 - 2 -14 0517.468 - 137 - .001 0650 14.4 0 -12 0576.474 0 .000 0846: 14.4: + 1 + 2 0591.534 + 35 - .014 1027 13.7 + 2 + 2 0639.385 + 146 + .029 2122 13.9 + 8 + 8 0698.354 + 283 - .007 0704.389 + 297 - .002 HBV 485 (M) 1028.262 +1049 - .012 1030.433 +1054 + .005 2428336: 14.8 - 7 +14 1031.294 +1056 + .005 9464 14.5 - 3 - 1 1033.439 +1061 - .003 2430015: 15.0: - 1 -21: 0330: - 0 + 8: 0621: 15.0: + 1 13: 0890: 15.0: + 2 + 3: HBV 494 (M) 242 9621 13.6 - 2 - 3 243 0012 13.6 - 1 +14 0390: - 0 +18 0741 13.7 + 1 - 5 ---------------------------------------------------------------- Table 5 Normal Points of Mean Light Curves ------------------------------------------------------------------------------- HBV 479 HBV 488 ------------------------------------------------------------------------------- 0.038 13.44m 4 0.676 11.44 10 0.000 15.81 8 0.849 14.86 10 .082 12.67 5 .734 11.43 10 .028 15.81 9 .920 14.88 7 .139 12.65 10 .781 11.41 10 .070 14.97 6 .954 15.11 5 .213 12.59 10 .818 11.45 10 .116 14.70 10 .976 15.44 4 .294 12.60 10 .867 11.46 10 .231 14.72 10 .999 15.81 4 .373 12.62 10 .908 11.50 10 .320 14.70 10 .422 12.67 7 .949 11.71 7 .429 14.68 10 HBV 495 .454 12.69 6 .977 12.30 5 .487 14.72 10 .498 12.84 4 .999 12.61 1 .587 14.75 10 0.028 14.05 5 .549 12.68 8 .645 14.70 10 .084 13.84 5 .593 12.64 10 HBV 484 .691 14.69 9 .175 13.87 15 .663 12.62 10 .748 14.73 8 .265 13.87 15 .745 12.60 10 0.002 15.02 3 .811 14.76 9 .439 13.87 15 .795 12.62 10 .013 14.81 5 .884 14.71 10 .513 13.86 15 .841 12.62 10 .098 13.69 10 .925 15.06 6 .576 13.88 15 .876 12.64 8 .161 13.69 10 .980 15.81 3 .661 13.91 12 .907 12.69 6 .220 13.68 10 .775 13.86 12 .960 13.45 4 .264 13.66 10 HBV 492 .904 13.89 10 .998 14.22 4 .318 13.66 10 .958 14.04 8 .391 13.67 10 0.000 16.08 3 .976 14.13 5 HBV 480 .453 13.74 10 .013 15.86 4 .998 14.19 5 .511 13.79 10 .041 15.52 5 0.000 12.57 3 .603 13.77 10 .081 15.35 10 .031 12.47 6 .652 13.66 10 .154 15.37 10 .090 12.21 10 .738 13.67 10 .246 15.36 10 .183 12.17 10 .807 13.68 10 .305 15.37 10 .294 12.16 10 .871 13.68 7 .393 15.35 10 .315 12.17 10 .910 13.88 5 .512 15.36 10 .453 12.19 7 .955 14.48 5 .667 15.35 10 ,511 12.20 9 .739 15.37 10 .554 12.19 10 HBV 487 (C) .788 15.34 10 .613 12.17 10 .835 15.36 10 .660 12.16 10 0.018 15.08 4 .884 15.35 7 .711 12.13 10 .089 15.22 5 .969 15.69 4 .770 12.16 10 .166 15.43 5 .990 16.00 4 .833 12.17 10 .225 15.52 5 .900 12.22 9 .283 15.56 5 HBV 493 .973 12.49 6 .383 15.72 5 .499 15.81 5 0.025 15.50 4 HBV 482 .522 15.80 5 .047 15.03 5 .575 15.91 4 .086 14.85 7 0.016 12.36 2 .606 15.91 5 .136 14.88 10 .039 11.90 4 .741 15.94 5 .181 14.84 10 .097 11.49 10 .840 15.95 5 .260 14.86 10 .197 11.48 10 .895 15.71 5 .353 14.87 10 .518 11.51 10 .935 15.62 5 .427 14.85 10 .379 11.52 8 .962 15.14 4 .464 14.86 8 .423 11.53 7 .991 15.00 4 .506 14.89 5 .462 11.58 5 .999 14.98 3 .554 14.84 10 .501 11.69 2 .621 14.84 10 .523 11.55 5 .723 14.84 10 .573 11.52 8 .625 11.47 10 ------------------------------------------------------------------------------- Notes on Individual Variables: HBV 479 CSV 5274= 94.1934 480 May also be classified as EA. 481 Heights of maxima vary between 13.7m and 14.4m. 482 CSV 5373= SVS 976. Maxima I and II different (11.48m and 11.41m). 483 A typical RCB variable. From long lasting nearly constant maximum brightness of about 13.7m the star faints within some 10 days to 15.8m immediately followed by a slower rise (about 30d) to normal light. Observe Minima: 242 9407,9614 and 243 2057. 484 CSV 5400 = SVS 681. Min I and II a bit asymmetric, the last one displaced to longer phases (0.55P). 485 Mira type. Only one maximum well observed. The variable is the western component of a double star. 486 BD + 61d2146 (9.0m). A long-wave variation is superposed by a sort of 50 days fluctuations of smaller amplitude. 487 A typical RRa, b variable. 488 The minimum light of this EA variable could not be observed. 489 Certainly an eclipsing star (EA). Only 3 faintings observed: 2429607.337 12.38m 2430633.378 12.63 n.P = 64.853d 0698.231 12.10 490 As shown by some night runs this star certainly is of the RR type with a period of about 0.5d +-. It was not possible to derive the true period from this material due to its scarcity. Observed Maxima : 243 0873.475 2431029.230: 0992.350 1061.220: 1026.370 1076.250 491 CSV 102116= 25.1919 Cep. Very red irregular star of spectral type N. It shows slow variations between 12.5m and 13.3m. According to BD and AGK3 a close double. 492 An EA variable. Difficult to measure as situated near the north edge of the plates and due to its faintness. 493 It looks like there is a secondary minimum of only 0.05m. 494 In minimum light this Mira variable is fainter than 16.3m. 495 An EA type variable of relatively small amplitude (0.33m). No secondary minimum observed. A.A. WACHMANN Hamburg Observatory [FIGURE 1] [FIGURE 2] [FIGURE 3] [FIGURE 4] [From IBVS 770] Correction to IBVS No749. Dr. WACHMANN asked to make the following corrections: p.2. Table 1. HBV 479 Min I = 14.22 instead of 15.02 481 delta = +63d30'21.7" " " 63d20'21.7" 492 delta = +63d34'40.8" " " 63034'41.8" p.3. Table 2. HBV 479 a = 12.27m " " 12.77m p.7. HBV 485 The variable is the eastern component of a double star (instead of western).