COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 2341 Konkoly Observatory Budapest 26 May 1983 HU ISSN 0374-0676 ANONYMOUS IRREGULAR VARIABLE IN PUPPIS In the course of photoelectric UBV observations of dwarf novae at the European Southern Observatory (1 m and Bochum 61 cm telescope) a comparison star near BV Pup was frequently measured. However, after the reduction of the long series of data it turned out that this reference star is variable also, with an amplitude of about 0.15m in a time scale of hours to days. These variations exceed the error of the measurement (<=0.02m) significantly. A periodogram analysis in the range 0.01d - 10d revealed no significant periodic variation. Therefore the variable seems to be of irregular type. The 82 individual observations listed in Table I yield the following mean values and standard deviations: V = 12.044+-0.034 B-V = 0.403+-0.037 U-B = -0.015+-0.031 The approximate position is alpha = 7h44m40s (1900) delta = -23d17.6' [FIGURE 1] Figure 1 Finding chart. 1: New variable 2: Dwarf nova BV Pup North is top. east is left. The bar corresponds to the size of one minute of arc. Table I The individual observations ---------------------------------------------------------------------- HJD- HJD- 2440000 V B-V U-B 2440000 V B-V U-B 618.6709 12.022 0.356 0.018 1369.6896 12.063 0.375 -0.019 619.5626 12.026 0.389 -0.023 1370.7251 12.070 0.375 -0.010 619.5751 12.027 0.387 -0.017 1381.5844 11.979 0.425 0.024 619.5830 12.024 0.399 -0.030 1381.6434 11.984 0.444 0.025 619.5938 12.015 0.397 -0.019 1382.5804 12.024 0.431 -0.016 619.6017 12.033 0.385 -0.020 1383.5818 12.104 0.398 0.013 619.6121 12.029 0.398 -0.007 1384.6496 12.041 0.414 -0.028 619.6225 12.029 0.405 -0.013 1385.6156 12.032 0.422 -0.003 619.6291 12.043 0.395 -0.039 1386.6307 12.042 0.401 0.003 619.6382 12.009 0.431 -0.022 1387.5710 12.016 0.401 -0.021 619.6457 12.033 0.401 -0.027 1387.6819 11.993 0.446 0.003 619.6611 12.027 0.410 -0.032 1388.6356 12.028 0.398 0.035 619.6694 12.027 0.408 -0.011 1389.6942 12.050 0.366 0.002 619.6806 12.032 0.398 -0.003 1391.6272 12.082 0.460 -0.062 619.6894 12.036 0.400 0.007 1393.5313 12.030 0.386 -0.033 619.7006 12.019 0.417 -0.026 1396.7366 12.038 0.415 -0.016 619.7089 12.024 0.412 -0.008 1396.7470 12.067 0.379 -0.050 619.7164 12.035 0.406 -0.005 1397.6777 12.035 0.381 0.044 619.7284 12.048 0.402 0.021 1398.6899 12.040 0.433 -0.021 619.7358 12.043 0.398 0.023 1399.6825 12.003 0.398 -0.022 619.7463 12.043 0.413 -0.035 1416.6612 12.105 0.348 0.000 619.7538 12.041 0.389 0.000 1417.5740 12.017 0.440 -0.030 619.7629 12.036 0.401 -0.019 1419.6058 11.993 0.418 -0.006 620.5441 12.018 0.390 -0.043 1421.5650 12.041 0.393 -0.014 620.6667 12.037 0.411 -0.025 1423.5427 12.037 0.405 0.017 620.7967 12.075 0.391 -0.041 1439.5685 12.068 0.403 -0.012 621.5463 12.019 0.384 -0.032 1440.5940 12.075 0.381 -0.057 622.5428 12.026 0.369 -0.005 1442.5219 12.061 0.388 -0.020 623.5495 11.998 0.379 -0.030 1661.8397 12.046 0.443 -0.050 625.5627 12.051 0.396 0.032 1664.8452 12.073 0.484 -0.089 626.5567 12.042 0.385 -0.034 1665.6590 12.196 0.447 -0.161 627.7533 12.079 0.347 -0.020 1669.7348 12.086 0.636 -0.079 628.7348 12.106 0.364 0.013 1669.8504 12.092 0.438 -0.056 630.6662 12.022 0.379 -0.033 2047.6961 11.980 0.420 -0.003 631.6987 12.052 0.388 -0.017 2162.5292 12.064 0.412 -0.037 633.7588 12.061 0.397 -0.016 2164.5167 12.080 0.373 -0.033 1364.6897 12.057 0.393 0.025 2165.5222 12.035 0.390 -0.022 1365.5594 12.039 0.379 0.031 2167.5616 12.123 0.365 -0.015 1366.6933 12.012 0.455 0.063 2168.5692 12.107 0.393 -0.012 1367.6931 12.093 0.381 -0.018 3260.5292 12.069 0.399 0.019 1368.7210 12.024 0.422 0.005 3557.6155 12.041 0.371 -0.008 ------------------------------------------------------------------ A finding chart according to Vogt (1977) is given in Fig. 1. The star is also included in the Sky Survey reproductions prepared for the field of BV Pup by Vogt and Bateson (1982). N. VOGT R. HAEFNER Universitats-Sternwarte Scheinerstr. 1 D--8000 Munchen 80 Germany References: Vogt, N. 1977, Publ. RASNZ, VSS, 5, 42 Vogt, N., Bateson, F.M. 1982, Astron. Astrophys. Suppl. Ser. 48, 383 [BIBCODE 1982A&AS...48..383V ]