COMMISSION 27 OF THE I.A.U. INFORMATION BULLETIN ON VARIABLE

Nos. 3501 - 3600 1990 August - 1991 May

EDITORS: L. Szabados and K. Olah KONKOLY OBSERVATORY H-1525 BUDAPEST P.O. Box 67, HUNGARY

HU ISSN 0374 - 0676 CONTENTS

3501 HD 90892: A NEW VARIABLE IN HYDRA E.M. Halbedel 8 August 1990

3502 HD 97305: A NEW VARIABLE IN LEO E.M. Halbedel 8 August 1990

3503 SOME NON-VARIABLE STARS E.M. Halbedel 8 August 1990

3504 THE IRAS SOURCE 04430-2356 = NSV 1710 IS A MIRA W. Wenzel 10 August 1990

3505 THE POSITION OF RZ NORMAE L.A. Milone 16 August 1990

3506 HD 196470 - A NEW EQUATORIAL RAPIDLY OSCILLATING Ap STAR P. Martinez, D.W. Kurtz, G. Kauffmann, A.C. Jonson 21 August 1990

3507 THE DISCOVERY OF RAPID OSCILLATIONS IN THE Ap STAR HD 161459 P. Martinez, G. Kauffmann 21 August 1990

3508 THE ULTRAVIOLET SPECTRUM OF CLOSE V448 CYGNI G.V. Volkova 21 August 1990

3509 TWO NEW SOUTHERN RAPIDLY OSCILLATING Ap STARS - HD 193756 AND HD 218495 P. Martinez, D.W. Kurtz 27 August 1990

3510 HD 190290 - ASTEROSEISMOLOGY IN ONE NIGHT P. Martinez, D.W. Kurtz 27 August 1990

3511 UNEXPLAINED LIGHT VARIATIONS OF THE F0 V STAR 9 AURIGAE K. Krisciunas, E. Guinan 31 August 1990

3512 V759 CENTAURI: NEW TIMES OF MINIMA AND REVISED PERIOD R.F. Sistero, B.A. Candellero, S. Marton, A. Grieco 31 August 1990

3513 THE CATACLYSMIC BINARY MV LYRAE RE-ATTAINED ITS UPPER LEVEL B. Fuhrmann, W. Wenzel 5 September 1990 3514 PHOTOMETRY OF THE NEW ECLIPSING BINARY DHK 16 = SAO 80992 D.B. Williams, M.E. Baldwin, D.H. Kaiser 5 September 1990

3515 SEARCH FOR SLOW LIGHT VARIATIONS OF STARS. II. N.I. Bondar' 10 September 1990

3516 ARE THE ALGOL-TYPE STARS V438 CENTAURI, V1156 CYGNI AND V929 OPHIUCHI SURROUNDED BY ACCRETION DISCS? - A CALL FOR OBSERVATIONS C. Friedemann, M. Lowe 12 September 1990

3517 ON THE AMPLITUDE OF THE RECURRENT NOVA V3890 Sgr W. Wenzel 12 September 1990

3518 THE CHANGING LIGHT CURVE OF THE Ap STAR 41 TAURI L. Mantegazza, E. Poretti, E. Riboni 14 September 1990

3519 UNUSUAL PHOTOMETRIC CHARACTER OF THE S-CEPHEID FF Aql I.A. Usenko 17 September 1990

3520 HD 12932, A NEW RAPIDLY OSCILLATING CP2 STAR H. Schneider, W.W. Weiss 28 September 1990

3521 A PERIOD ANALYSIS OF THE SEMI-REGULAR VARIABLE SW Vir J.E. Armour, G.W. Henry, S.L. Baliunas 1 October 1990

3522 QUIESCENT LIGHT VARIATION OF UV Per T. Kato 1 October 1990

3523 B, V, R, I LIGHT CURVES OF V743 SAGITTARII AND ERRATA FOR EH HYDRAE R.G. Samec, J.R. Dewitt 5 October 1990

3524 PHOTOELECTRIC PHOTOMETRY OF TZ BOOTIS D. Schaub 9 October 1990

3525 VARIABILITY OF TWO SUPERGIANTS: HD 3940 AND HD 10494 E. Zsoldos 10 October 1990

3526 UX ANTLIAE, UW CENTAURI AND RZ NORMAE AT MINIMUM BRIGHTNESS L.A. Milone, E.R. Minniti, S. Paolantonio 15 October 1990

3527 NEW PHOTOELECTRIC MINIMA TIMES OF TZ DRACONIS AND ITS PERIOD STUDY H. Rovithis-Livaniou, P. Rovithis 16 October 1990

3528 PHOTOELECTRIC MINIMA TIMES OF GK CEPHEI AND VARIATIONS IN ITS PERIOD H. Rovithis-Livaniou, P.G. Niarchos, P. Rovithis, A. Kalimeris 16 October 1990 3529 PHOTOMETRIC PERIODICITY OF V404 Cyg (= GS 2023+338) T. Kato, R. Hirata 24 October 1990

3530 THE 70th NAME-LIST OF VARIABLE STARS E.V. Kazarovets, N.N. Samus 24 October 1990

3531 A NEW, APPARENTLY UNUSUAL DELTA SCUTI STAR, HD 18878 M.S. Frolov, A.V. Kusakin, A.V. Mironov, V.G. Moshkalev 24 October 1990

3532 ON THE NATURE OF THE CATACLYSMIC VARIABLE V426 OPHIUCHI W. Wenzel, E. Splittgerber 29 October 1990

3533 DIFFERENTIAL PHOTOELECTRIC PHOTOMETRY OF THE DELTA SCUTI STAR AV CETI S.F. Gonzalez-Bedolla, A. Rolland, E. Rodriguez, P. Lopez de Coca 29 October 1990

3534 FIRST SYNTHETIC SOLUTION FOR THE W UMa SYSTEM PP Lac A. Gaspani 31 October 1990

3535 1990 BVR PHOTOMETRY OF XY UMa M. Zeilik, C. de Blasi, S. Gordon, M. Ledlow 31 October 1990

3536 THE X-RAY SOURCE HD 197010 IS AN ECLIPSING BINARY R.M. Robb, F.W. Dean, C.D. Scarfe 1 November 1990

3537 PHOTOELECTRIC OBSERVATIONS OF THE ALGOL-TYPE BINARY STAR RZ Oph S. Zola 1 November 1990

3538 VARIABILITY OF THE DEPTH OF THE MINIMA OF THE DOUBLE SYSTEM HD 135421 A. Dapergolas, E. Kontizas, M. Kontizas 6 November 1990

3539 AN INDEPENDENT CONFIRMATION OF RAPID OSCILLATIONS IN THE COOL Ap STAR HD 12932 T.J. Kreidl 8 November 1990

3540 AW UMa IS IN ACTIVE PHASE OF MASS TRANSFER E. Derman, O. Demircan, Z. Muyesseroglu 12 November 1990

3541 1990 OPTICAL ELLIPTICAL POLARIMETRY AND CENTIMETER FLUX OBSERVATIONS OF THE VERY ACTIVE SOLAR-TYPE STAR HD 129333 N.M. Elias II, J.D. Dorren 13 November 1990

3542 HD 20629: AN X-RAY SELECTED OPTICALLY VARIABLE Ap STAR G. Cutispoto, G. Tagliaferri, F.A. Catalano 16 November 1990

3543 THE DISCOVERIES OF V154 IN M3 W.P. Bidelman 21 November 1990 3544 BV LIGHT CURVES AND THE FIRST EPHEMERIS FOR THE ECLIPSING BINARY STAR NSV 1776 G. Boistel, R. Boninsegna, M. Dumont 21 November 1990

3545 NO "CHROMOSPHERIC ACTIVITY" SEEN IN Eta And K.G. Strassmeier, J. Hron 28 November 1990

3546 "NOVA" PQ And - FURTHER OUTBURSTS G.A. Richter 5 December 1990

3547 THE X-RAY SOURCE 1E1615.0+3114 IS AN ECLIPSING BINARY R.M. Robb, F.W. Dean, C.D. Scarfe 5 December 1990

3548 PHOTOMETRY OF (Dec 1981 TO Apr 1990) K. Krisciunas, E. Guinan 6 December 1990

3549 uvby OBSERVATIONS OF THE ALGOL-TYPE STAR V1156 CYGNI C. Friedemann, H.-G. Reimann 2 January 1991

3550 SIMULTANEOUS TWO-COLOUR OBSERVATION OF THE FLARE STAR EV Lac IN AUGUST 1990 A. Karapetian, V. Zalinian 2 January 1991

3551 1987-1989 UBV PHOTOMETRY OF OO AQUILAE O. Demircan, E. Derman, F. Ekmekci 4 January 1991

3552 TIMES OF MINIMUM LIGHT FOR 17 ECLIPSES OF 7 DETACHED BINARIES D.B. Caton, W.C. Burns, R.L. Hawkins 7 January 1991

3553 DISCOVERY OF RAPID OSCILLATIONS IN HD 19918 P. Martinez, D.W. Kurtz 10 January 1991

3554 FIRST PHOTOELECTRIC LIGHTCURVES IN TWO COLORS AND IMPROVED ELEMENTS FOR V482 Per AND V651 Cas F. Agerer, D. Lichtenknecker 16 January 1991

3555 PHOTOELECTRIC LIGHT CURVE IN TWO COLOURS AND IMPROVED ELEMENTS FOR V724 AQUILAE F. Agerer, D. Lichtenknecker 16 January 1991

3556 CG CYGNI REDUX: MORE 1989 BVR DATA D. Beckert, S. Gordon, E. Jaderlund, E. Mann, M. Zeilik 17 January 1991

3557 MISCLASSIFIED RV TAURI STARS E. Zsoldos 18 January 1991 3558 SPORADIC PHOTOMETRY OF PLEIONE J.D. Fernie 28 January 1991

3559 A NEW FORECAST FOR HS HERCULIS I. Todoran 4 February 1991

3560 BINARY SYSTEM 44i BOOTIS G. Oprescu, M.D. Suran, N. Popescu 4 February 1991

3561 SPECTROSCOPIC OBSERVATIONS OF FIVE F SUPERGIANT STARS S. Tamura, M. Takeuti 11 February 1991

3562 ON THE DELTA SCUTI PERIOD- RELATION J.R. King 11 February 1991

3563 THE LONG-TERM BEHAVIOUR OF MWC 560 R. Luthardt 14 February 1991

3564 LIGHT CURVES FOR AB DORADUS T. Banks 15 February 1991

3565 ON SOME MISTAKES IN THE 4th EDITION OF THE GCVS E.V. Kazarovets 20 February 1991

3566 ON TWO POSSIBLE GROUPS OF PULSATING BLUE STRAGGLERS WITH DIFFERENT MASSES IN GLOBULAR CLUSTERS M.S. Frolov 20 February 1991

3567 FLICKERING IN CATACLYSMIC VARIABLES WITH BRIGHT ACCRETION DISKS A. Bruch 25 February 1991

3568 NATURE OF VARIABILITY OF VV Scl P. Renson 1 March 1991

3569 RECENT MINIMA AND IMPROVED EPHEMERIDES FOR THE ECLIPSING HOT SUBDWARFS LB 3459 (= AA Dor) AND BD -7d3477 (= HW Vir) D. Kilkenny, M. Harrop-Allin, F. Marang 7 March 1991

3570 1988 AND 1989 PHOTOMETRY OF UZ LIBRAE P.A. Heckert, M.A. Hickman 8 March 1991

3571 WR 22 IS AN ECLIPSING BINARY STAR E. Gosset, M. Remy, J. Manfroid, J.-M. Vreux, C. Sterken, L.A. Balona, G.A.P. Franco 8 March 1991 3572 ANALYSIS OF X-RAY ECLIPSES IN SS 433 E.A. Antokhina, A.M. Cherepashchuk, E.V. Seyfina 8 March 1991

3573 NEW VARIABLE STARS IN THE FIELD OF IC 1805 V. Gasperoni, P. Maffei, G. Tosti 11 March 1991

3574 V1963 Sgr - A NEW W UMa TYPE STAR P. Maffei, G. Tosti 11 March 1991

3575 PHOTOELECTRIC OBSERVATION OF VW CEPHEI IN R AND IR K. Arai 12 March 1991

3576 A VERY INTERESTING VARIABLE V627 Cas (AS 501): BRIGHTENING FORECAST FOR MID-1991 E.A. Kolotilov, A.S. Miroshnichenko, B.F. Yudin 12 March 1991

3577 SIMULTANEOUS PHOTOELECTRIC OBSERVATIONS OF AD LEONIS A.P. Antov, V.V. Genkov, R. Konstantinova-Antova, N.K. Kirov 14 March 1991

3578 CCD PHOTOMETRY OF BX PEGASI IN 1990 J.A. DeYoung, R.E. Schmidt, L.I. Gritz 15 March 1991

3579 A NEW ECLIPSING VARIABLE IN THE BX PEGASI FIELD J.A. DeYoung 15 March 1991

3580 THE PHOTOELECTRIC PHOTOMETRY OF THE SUSPECTED VARIABLE PG 0900+401 N.A. Lipunova, S.Yu. Shugarov 20 March 1991

3581 OBSERVATIONS OF SUPERNOVA 1989 B I.M. Volkov 20 March 1991

3582 IS BN Ori STARTING AGAIN? G.U. Kovalchuck 22 March 1991

3583 UBV PHOTOMETRY OF THE SYMBIOTIC STAR V1329 Cyg IN 1989-1990 A. Dapergolas, E. Kontizas, M. Kontizas 22 March 1991

3584 LIGHT-CHANGES OF THE CENTRAL STAR OF PLANETARY NGC 2346 IN JANUARY 1991 L. Kohoutek 22 March 1991

3585 HD 50138: PHOTOMETRIC BEHAVIOUR CONNECTED WITH ITS RECENT SHELL EPISODE E.M. Halbedel 4 April 1991

3586 PHOTOMETRY OF TWO CANDIDATES FOR M67 CONTACT BINARIES J. Kaluzny, J. Radczynska 4 April 1991 3587 BV OBSERVATIONS OF THE Oct. 1990 ECLIPSE OF 22 Vul R. Nolthenius 5 April 1991

3588 VARIABLE STARS IN THE IRAS POINT SOURCE CATALOGUE W.P. Bidelman 16 April 1991

3589 HD 12545: A RECORD PHOTOMETRIC AMPLITUDE FOR AN RS CVn STAR R. Nolthenius 17 April 1991

3590 THE PULSATION AMPLITUDE OF Delta CETI C.D. Pike, C. Lloyd 17 April 1991

3591 ON THE NEW ERUPTIVE OBJECT IN LIBRA W. Wenzel 18 April 1991

3592 HD 127759: A NEW DELTA SCUTI VARIABLE Li Zhiping, Jiang Shiyang, Liu Yiangyin, Cao Ming 19 April 1991

3593 EPOCHS OF MINIMUM LIGHT FOR EIGHT ECLIPSING BINARY STAR SYSTEMS C.R. Mullis, D.R. Faulkner 22 April 1991

3594 PHOTOMETRIC VARIABLE STARS FOUND IN FIVE SOUTHERN OPEN CLUSTERS E. Lapasset, J.J. Claria, D. Minniti 25 April 1991

3595 ON THE TWO-COMPONENT STRUCTURE OF SPECTRUM-FORMING LAYER OF METALS IN CEPHEID T Vul Z.N. Fenina, N.S. Zgonyaiko, N.D. Lemeshchenko 26 April 1991

3596 NEW PERIOD FOR GS Cep D. Hanzl, P. Novak, P. Hajek, P. Mayer 3 May 1991

3597 HD 105759, A NEW SHORT PERIOD A. Colomba, G. de Benedetto, A. Ielo 6 May 1991

3598 PHOTOGRAPHIC OBSERVATIONS OF V651 Mon DURING 1988-89 Hao Xiang-Liang ERRATUM N.I. Bondar' 6 May 1991

3599 NEW UBV LIGHT CURVES OF THE EARLY-TYPE ECLIPSING BINARY V1331 Aql R. Lorenz, H. Dreschel, P. Mayer 7 May 1991

3600 SEVEN OF PHOTOMETRY FOR HR 8752 = V509 Cas E.M. Halbedel 8 May 1991