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COMMISSION 27 OF THE I.A.U.

INFORMATION BULLETIN ON VARIABLE

Nos. 2401 - 2500

1983 September - 1984 March

EDITORS: B. SZEIDL AND L. SZABADOS, KONKOLY OBSERVATORY

1525 BUDAPEST, Box 67, HUNGARY

HU ISSN 0374-0676 CONTENTS

2401 A POSSIBLE CATACLYSMIC VARIABLE IN Masaaki Huruhata 20 September 1983

2402 A NEW RR-TYPE VARIABLE IN LEO Masaaki Huruhata 20 September 1983

2403 ON THE BD +43d1894 A. Yamasaki, A. Okazaki, M. Kitamura 23 September 1983

2404 IQ Vel: IMPROVED LIGHT-CURVE PARAMETERS L. Kohoutek 26 September 1983

2405 FLARE ACTIVITY OF ? I.-S. Nha, S.J. Lee 28 September 1983

2406 PHOTOELECTRIC OBSERVATIONS OF 20 CVn Y.W. Chun, Y.S. Lee, I.-S. Nha 30 September 1983

2407 MINIMUM TIMES OF THE ECLIPSING VARIABLES AH Cep AND IU Aur Pavel Mayer, J. Tremko 4 October 1983

2408 PHOTOELECTRIC OBSERVATIONS OF THE EV Lac IN 1980 G. Asteriadis, S. Avgoloupis, L.N. Mavridis, P. Varvoglis 6 October 1983

2409 HD 37824: A NEW Douglas S. Hall, G.W. Henry, H. Louth, T.R. Renner 10 October 1983

2410 ON THE PERIOD OF BW VULPECULAE E. Szuszkiewicz, S. Ratajczyk 12 October 1983

2411 THE UNIQUE DOUBLE-MODE CEPHEID CO Aur E. Antonello, L. Mantegazza 14 October 1983

2412 FLARE STARS IN TAURUS A.S. Hojaev 14 October 1983

2413 BVRI OF THE ECLIPSING BINARY QX Cas Thomas J. Moffett, T.G. Barnes, III 17 October 1983

2414 THE ABSOLUTE OF AZ CANCRI William P. Bidelman, D. Hoffleit 17 October 1983

2415 NEW DATA ABOUT THE APSIDAL MOTION IN THE SYSTEM OF RU MONOCEROTIS D.Ya. Martynov 18 October 1983

2416 V OF CC COMAE G.V. Zhukov 18 October 1983

2417 SPECTROSCOPIC INVESTIGATION OF SZ Lyn AND SS Psc G.A. Garbuzov 18 October 1983

2418 INACTIVE STATE OF MV LYRAE I.L. Andronov, S.Yu. Shugarov 18 October 1983

2419 HD 34409 - A DELTA SCUTI VARIABLE R.K. Srivastava, A.K. Arya 19 October 1983

2420 TWO NEW VARIABLE STARS IN THE FIELD OF NGC 6946 G. Romano, M. Perissinotto 19 October 1983

2421 NOTE OF THE SEMI-REGULAR VARIABLE TT Scl P.S. The 24 October 1983

2422 FT LUPI: STUDY OF THE PERIOD AND LIGHT CURVE S.L. Lipari, R.F. Sistero 24 October 1983

2423 V1057 CYGNI Gunnar Welin 25 October 1983

2424 PHOTOELECTRIC MINIMA TIMES OF BX ANDROMEDAE P. Rovithis, H. Rovithis-Livaniou 1 November 1983

2425 DETERMINATION OF CEPHEID DISTANCES BY MEANS OF WESENHEIT FUNCTION Antoni Opolski 1 November 1983

2426 AD Leo FLARE MONITORING Richard B. Herr, J.D. Frank 2 November 1983

2427 PHOTOELECTRIC HalphaW OBSERVATIONS OF R CMa M.T. Edalati, B. Khalesse, N. Riazi 2 November 1983

2428 NEW OBSERVATIONS OF HZ Her V.V. Hambarian, G.H. Broutian CORRIGENDUM 8 November 1983

2429 PHOTOMETRIC STUDY OF IO ANDROMEDAE I.L. Andronov 9 November 1983

2430 ON THE CYCLE LENGTH OF THE CATACLYSMIC VARIABLE T LEONIS W. Wenzel 9 November 1983

2431 SUDDEN BRIGHTENING OF THE RECENTLY DISCOVERED HR 7739 K. Pavlovski, H. Bozic, P. Harmanec, J. Horn, P. Koubsky 14 November 1983

2432 POLARIMETRY OF Be STARS IN THE NGC 6611 L.A.S. Reis, E. Janot-Pachecho 18 November 1983

2433 A NEW PROBABLE FLARE STAR N. Sanduleak 23 November 1983

2434 ANOTHER SEMI-REGULAR VARIABLE IN CYGNUS G. Auner, H. Hartl, R. Weinberger 25 November 1983

2435 ON THE VARIABILITY OF THE STAR SAO 072799 P.G. Niarchos 25 November 1983

2436 ON THE PERIOD OF BD Cir Silvano F. Marton, A. Grieco 28 November 1983

2437 PHOTOELECTRIC OBSERVATIONS OF UV CETI M.K. Tsvetkov, L.N. Mavridis, G.A. Asteriadis 29 November 1983

2438 PERIODIC LIGHT VARIABILITY OF PG1711+336 A.V. Mironov, V.G. Moshkalev, S.Yu. Shugarov 30 November 1983

2439 V417 AQUILAE: PHOTOELECTRIC OBSERVATIONS AND IMPROVED PERIOD Danny R. Faulkner 2 December 1983

2440 V3876 Sgr, A STAR, NOT A Emilia P. Belserene 5 December 1983

2441 PHOTOMETRIC VARIATIONS IN THE Ap STAR HD 215441 M. Corbin 5 December 1983

2442 PHOTOELECTRIC OBSERVATIONS OF R CrB D. Bohme 9 December 1983

2443 REMARKS ON THREE VARIABLE STARS Thomas Berthold 9 December 1983

2444 EPSILON AURIGAE Eugenio E. Mendoza V. 13 December 1983

2445 POLARIMETRIC OBSERVATIONS OF Be STARS L.A.S. Reis, E. Janot-Pachecho 14 December 1983 2446 THE HBeta EMISSION OF PU Vul Liu Zongli, Hao Xiangliang 16 December 1983

2447 THE Be BINARY HR 2142: NO 0.13m BRIGHTNESS DECREASE IN JANUARY 1983 P. Harmanec, J. Horn, P. Koubsky, K. Pavlovski, H. Bozic, J. Ziznovsky, J.R. Percy 16 December 1983

2448 A NOTE ON X TRIANGULI P. Rovithis, H. Rovithis-Livaniou 20 December 1983

2449 X-RAY VARIABLE STARS IN THE PLEIADES S. Sciortino, G. Micela, S. Serio, G.S. Vaiana, L. Golub, F.R. Harnden, Jr., R. Rosner 20 December 1983

2450 FLARE LIKE ACTIVITY IN AR LACERTAE R.K. Srivastava 23 December 1983

2451 PHOTOELECTRIC TIMES OF MINIMA OF ECLIPSING VARIABLES P.G. Niarchos 23 December 1983

2452 ACTIVE AND INACTIVE STATES OF THE X-RAY BINARY 4U 2129+47 = V1727 CYGNI W. Wenzel 27 December 1983

2453 VARIABLE STAR TIMINGS FROM ARIZONA Andrew P. Odell, F. Dorchak, K. Rogalski, S. Tapia, W.Z. Wisniewski, D.H. Smith 27 December 1983

2454 HD 104901B AN F-TYPE SUPERGIANT ECLIPSING BINARY Olin J. Eggen 28 December 1983

2455 Halpha VARIABILITY IN ALPHA LYRAE P.S. Goraya, M. Singh 30 December 1983

2456 CO Aur - DOUBLE MODE CHARACTER CONFIRMED B. Fuhrmann, R.H. Schult 2 January 1984

2457 NEW PHOTOELECTRIC MINIMA TIMES OF VW CEPHEI P. Rovithis, H. Rovithis-Livaniou 4 January 1984

2458 A DATABASE FOR RS CVn SYSTEMS E. Nelson, M. Zeilik 6 January 1984

2459 THE LONG TIME BEHAVIOUR OF THE POLAR AM Her IN 1983 W. Gotz 10 January 1984

2460 ON THE DELTA SCUTI-LIKE VARIABILITY OF THE Ap STAR HD 10088 Tobias J. Kreidl 16 January 1984

2461 THE LIGHT CURVE OF FG Vul IN 1983 W. Gotz 18 January 1984

2462 ON THE SX Phe-TYPE STARS M.S. Frolov, B.N. Irkaev 20 January 1984

2463 NEW DATA ON THE MOST RECENT MINIMUM OF THE X-RAY SOURCE KR Aur Martha H. Liller, M.D. Popova 20 January 1984

2464 REVISED PHOTOMETRIC RESULTS OF SAO 072799 P.G. Niarchos 24 January 1984

2465 NARROW BAND PHOTOMETRY OF FG Vir P. Lopez de Coca, R. Garrido, V. Costa, A. Rolland 27 January 1984

2466 WEAKENING OF HBeta EMISSION OF PU Vul Liu Zongli, Hao Xiangliang 30 January 1984

2467 FURTHER OBSERVATIONS OF THE CENTRAL STAR IN THE PLANETARY NGC 2346 Brian F. Marino, H.O. Williams, W.S.G. Walker 1 February 1984

2468 THE AND PHOTOGRAPHIC LIGHT CURVE OF THE ECLIPSING BINARY V339 Per E.H. Geyer, F. Gieseking 3 February 1984

2469 PERIOD CHANGE OF THE ECLIPSING BINARY IM AURIGAE O. Gulmen, C. Sezer, N. Gudur 6 February 1984

2470 OUTBURST OF VY Aqr IN 1983 Masaaki Huruhata 6 February 1984

2471 POSSIBLE DISCOVERY OF REPEATING OSCILLATIONS IN THE BRIGHTNESS OF BY DRACONIS ON TIMESCALES OF 1-3 HOURS P.F. Chugainov 7 February 1984

2472 LACK OF DETECTION OF A 1.77 h -PERIODICITY IN THE CP STAR HD 32633 Tobias J. Kreidl 8 February 1984

2473 EPOCHS OF MINIMUM LIGHT, DISPLACED SECONDARY ECLIPSE OF SW LACERTAE Danny R. Faulkner, E.E. Evans III, D.H. Grossoehme, E.J. Moyer, Jr. 8 February 1984

2474 NEW OBSERVATIONS OF CN ANDROMEDAE E.J. Michaels, N.L. Markworth, J.B. Rafert 8 February 1984

2475 PERIODIC LIGHT CURVE VARIATIONS OF RT LACERTAE S. Evren, C. Ibanoglu, Z. Tunca, O. Tumer 9 February 1984

2476 NEW VARIABLE STARS IN THE REGION Katya P. Tsvetkova 10 February 1984

2477 ON THE PERIOD OF BH CENTAURI Tibor J. Herczeg 13 February 1984

2478 ON THE PERIODS OFF RZ COMAE AND V1073 CYGNI Zeki Aslan, T.J. Herczeg 13 February 1984

2479 ON THE PERIOD OF THE W UMa SYSTEM Epsilon CrA J. Manfroid, M. Lunel, J. Bergeat, P. Bouchet 15 February 1984

2480 THE PHASE BEHAVIOUR OF THE GENEVA Z AND DELTA(V1-G) PARAMETERS FOR 41 Tau, 56 Tau AND 49 Cnc M. Muciek, J. Gertner, P. North, F.G. Rufener 17 February 1984

2481 ON THE NATURE OF THE CATACLYSMIC BINARY V2051 OPHIUCHI W. Wenzel 22 February 1984

2482 A FLARE-LIKE EVENT ON THE LIGHT CURVE OF V351 Ori G.U. Kovalchuk 24 February 1984

2483 FO And - PROBABLY A NEW MEMBER OF THE SU UMa SUB-GROUP OF DWARF NOVAE L. Meinunger 29 February 1984

2484 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR UV Cet IN OCTOBER 1983 I.V. Ilyin 1 March 1984

2485 THE ECLIPSE OF THE SYMBIOTIC ECLIPSING BINARY SYSTEM CI CYGNI IN 1982 T.S. Belyakina 5 March 1984

2486 THE DISCOVERY OF A W URSAE MAJORIS VARIABLE IN THE SYSTEM ADS 9019 R.L. Walker 6 March 1984

2487 PHOTOELECTRIC OBSERVATIONS OF THE EW-VARIABLE VZ Psc E. Poretti 6 March 1984

2488 IMPROVED POSITIONS FOR 15 CATACLYSMIC VARIABLE STARS Alan L. Kiplinger 7 March 1984

2489 NEW DOUBLE-LINED ECLIPSING BINARIES FOUND WITH RETICON, DIGICON, AND CCD DETECTORS Claud H. Lacy 7 March 1984 2490 IMPROVED OUTBURST LIGHT CURVES OF THE NOVAE EY Aql, BC Cas, MT Cen, AND V745 Sco H.W. Duerbeck 7 March 1984

2491 HIGHLY EXCITED EMISSION LINES IN BX Mon AND ZZ CMi T. Iijima 13 March 1984

2492 A CLOSE ECLIPSING BINARY SYSTEM IN CYGNUS S.Yu. Shugarov 16 March 1984

2493 SHELL EPISODE OF (BU Tau) P.S. Goraya 19 March 1984

2494 BD +37d443: A NON-VARIABLE STAR Andrea Cimatti, M. Lolli, G. Mengoli 21 March 1984

2495 ON THE PERIOD OF AG PEGASI R. Luthardt 22 March 1984

2496 AN UV ACTIVE PHENOMENON OF EPSILON AURIGAE Tosio Oki, I. Sekiya, K. Hirayama 23 March 1984

2497 NEW LIGHT ELEMENTS AND TIMES OF MINIMUM FOR AO CAMELOPARDALIS Ernest E. Evans III, D.H. Grossoehme, E.J. Moyer, Jr. 23 March 1984

2498 SIX NEW VARIABLE STARS H.H. Guetter, A.V. Hewitt 28 March 1984

2499 UBV OBSERVATIONS FOR ELEVEN KNOWN VARIABLE STARS H.H. Guetter, A.V. Hewitt 28 March 1984

2500 PHOTOELECTRIC OBSERVATIONS OF CY AQUARII A. Purgathofer, A. Schnell 28 March 1984