COMMISSION 27 OF THE I.A.U.

INFORMATION BULLETIN ON VARIABLE

Nos. 501-600

1970 December – 1971 December

EDITORS: L. DETRE AND B. SZEIDL, KONKOLY OBSERVATORY 1525 BUDAPEST, Box 67, HUNGARY CONTENTS

0501 MINIMA OF ECLIPSING VARIABLES L.P. Surkova 28 December 1970

0502 PHOTOELECTRIC LIGHT-CURVE OF KP Aql C. Ibanoglu, Omur Gulmen 31 December 1970

0503 A LIKELY 15.5 APSIDAL MOTION PERIOD IN HS Her D.S. Hall 4 January 1971

0504 ON THE VARIABILITY AND PERIOD OF BH DRACONIS W.R. Boy, Eduard W. Burke, Jr. 5 January 1971

0505 THE SPECTRUM OF THE JULY 1970 SUPERNOVA IN M101 F. Stienon, Thomas Wdowiak 9 January 1971

0506 HBV 476 P. Klawitter 18 January 1971

0507 A NEW ECLIPSING BINARY IN SAGITTARIUS M.J. Keyes 18 January 1971

0508 PHOTOELECTRIC MINIMA OF ECLIPSING VARIABLES C. Popovici 20 January 1971

0509 ABOUT THE VARIABILITY OF THE ECLIPSING VARIABLE NQ Her C. Popovici 20 January 1971

0510 PROCEDURAL CHANGES FOR USERS OF THE IAU (27). RAS FILE OF PHOTOELECTRIC OBSERVATIONS OF VARIABLE STARS W.S. Fitch 21 January 1971

0511 THE LIGHT CURVE OF RU CAMELOPARDALIS DURING THE PERIOD OCTOBER 1969 - AUGUST 1970 P. Broglia, G. Guerrero 23 January 1971

0512 A LONG-PERIOD ECLIPSING BINARY L.J. Robinson, M. Harwood 28 January 1971

0513 TIMES OF MAXIMUM FOR MIRA VARIABLES Th.G. Barnes, B.M. Barnes 30 january 1971 0514 NEW FLARE STARS IN THE PLEIADES OBSERVED AT ASIAGO FROM SEPTEMBER 1969 TO FEBRUARY 1970 L. Pigatto, L. Rosino 8 February 1971

0515 A POSSIBLE FIFTH SUPERNOVA (1969) IN THE SPIRAL NGC 6946 L. Rosino 8 February 1971

0516 PROGRAMME OF COOPERATIVE OBSERVATIONS OF FLARE STARS FOR 1971 A.D. Andrews, P.F. Chugainov, V.S. Oskanian, E.M. Kellogg 8 February 1971

0517 ON A POSSIBLE NOVA AT GREAT DISTANCE FROM THE CENTRE OF M31 A.S. Sharov, A.K. Alksnis 16 February 1971

0518 HBV 477 A NEW ECLIPSING VARIABLE IN THE CYGNUS-CLOUD H. Bossen 14 February 1971

0519 A NOTE ON LY AURIGAE = 35921 F.B. Wood 18 February 1971

0520 ON THE CAUSE OF PERIODIC LIGHT VARIATIONS OF SOME RED DWARF STARS P.F. Chugainov EDITOR'S NOTE ON CHUGAINOV'S PAPER MENTIONED ABOVE L. Detre 22 February 1971

0521 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR YZ CMi DURING THE 1971 JANUARY 15 - FEBRUARY 2 INTERNATIONAL PATROL P.F. Chugainov, N.I. Shakhovskaya, G.N. Alekseev 22 February 1971

0522 TWO NEW VARIABLE STARS G. Romano, M. Perissinotto 22 February 1971

0523 PHOTOELECTRIC OBSERVATIONS OF YZ CMi V.S. Oskanian CORRECTION TO NO. 503 (HS Her) 23 February 1971

0524 YZ CMi K. Osawa, K. Ichimura, K. Okida, H. Koyano 26 February 1971

0525 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR EV Lac DURING THE 1970 AUGUST 23 - SEPTEMBER 9 INTERNATIONAL PATROL S. Cristaldi, M. Rodono 26 February 1971

0526 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR UV Cet DURING THE 1970 SEPTEMBER 22 - OCTOBER 9 INTERNATIONAL PATROL S. Cristaldi, M. Rodono 26 February 1971 0527 HD 197753: A NEW RED VARIABLE? M. Wisse 27 February 1971

0528 UNUSUAL DISTRIBUTION OF FLARE STARS IN PLEIADES L.V. Mirzoyan, M.A. Mnatsakanian 4 March 1971

0529 AD LEONIS, FEBRUARY 15-21, 1971 K. Osawa, K. Ichimura 8 March 1971

0530 PHOTOELECTRIC MINIMA OF ECLIPSING BINARIES A. Kizilirmak, E. Pohl 9 March 1971

0531 NEW OBSERVATIONS OF GAMMA BOOTIS J.P. Sareyan, G. Zribi, A. Bijaoui 12 March 1971

0532 THE SECONDARY PERIOD OF THE SW PISCIUM V. Ureche 20 March 1971

0533 A PHOTOMETRIC MINIMUM OF THE ECLIPSING BINARY SZ CAMELOPARDALIS E.H. Olsen 25 March 1971

0534 PHOTOELECTRIC OBSERVATIONS OF AD Leo P.F. Chugainov, N.I. Shakhovskaya CORRECTION TO NO. 176 7 April 1971

0535 SOME REMARKS CONCERNING THE TIME-DISTRIBUTION OF FLARES OF UV CETI TYPE STARS V.S. Oskanian, V.Yu. Terebizh 14 April 1971

0536 ETOILES DU TYPE BY DRACONIS M. Petit 16 April 1971

0537 THE SUPERNOVA SERVICE OF THE ABASTUMANI ASTROPHYSICAL OBSERVATORY E.K. Kharadze 18 April 1971

0538 OBSERVATIONS OF THE FLARE STAR UV Cet DURING THE 1970 SEPTEMBER 22 - OCTOBER 9 INTERNATIONAL PATROL F.M. Bateson, B.F. Marino, W.S.G. Walker, D.J. Cameron, P.D. Cain 19 April 1971

0539 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR YZ CMi JANUARY 1971 F.M. Bateson 19 April 1971

0540 PHOTOGRAPHIC OBSERVATIONS OF NOVA IN L.M.C. F.M. Bateson 19 April 1971 0541 PLANETARY FG SAGITTAE STOPPED BRIGHTENING W. Wenzel, W. Furtig 22 April 1971

0542 PHOTOELECTRIC OBSERVATIONS AND TIMES OF MINIMA OF Y CYGNI D.J.K. O'Connell 23 April 1971

0543 V1057 Cyg G.H. Herbig, E.A. Harlan 27 April 1971

0544 A NOTE ON THE OF SS CYGNI M.F. Walker, Glenn H. Reagan 3 May 1971

0545 A NEW VARIABLE STAR IN SERPENS F.M. Stienon EDITOR'S NOTE ON BY Dra, SP K6Ve L. Detre 3 May 1971

0546 RY TAURI B.A. Dragomiretskaia, V. Tsessevich 8 May 1971

0547 UBV PHOTOMETRY OF THE COMPOSITE STAR DELTA SAGITTAE D.S. Hall 7 May 1971

0548 PHOTOGRAPHIC LIGHT-CURVE OF HBV 476 P. Klawitter 14 May 1971

0549 PHOTOELECTRIC OBSERVATIONS OF ETA CARINAE F.M. Bateson 14 May 1971

0550 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR AD Leo DURING THE 1971 FEBRUARY 18 - MARCH 4 INTERNATIONAL PATROL S. Cristaldi, M. Rodono 20 May 1971

0551 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR BD +16d2708 DURING THE 1971 MARCH 20 - APRIL 2 INTERNATIONAL PATROL S. Cristaldi, M. Rodono 20 May 1971

0552 PHOTOELECTRIC OBSERVATIONS OF BD +16d2708 P.F. Chugainov, N.I. Shakhovskaya 24 May 1971

0553 PHOTOELECTRIC OBSERVATIONS OF YZ CMi AND AD Leo P.F. Chugainov, N.I. Shakhovskaya 24 May 1971

0554 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR YZ CMi DURING THE 1971 JANUARY 16 - FEBRUARY 2 INTERNATIONAL PATROL S. Cristaldi, M. Rodono 24 May 1971 0555 PHOTOELECTRIC LIGHT CURVES OF PV CASSIOPEIAE C. Ibanoglu 26 May 1971

0556 PHOTOMETRY OF DELTA SCUTI VARIABLES HR 2107 AND HR 5005 J.C. Valtier 26 May 1971

0557 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR YZ CMi T.R. Bhatt, S.D. Sinvhal 29 May 1971

0558 NEW BRIGHT SOUTHERN VARIABLE STARS D. Friedrich, E. Schoffel 7 June 1971

0559 ON THE SPECTRUM OF THE SERPENS VARIABLE B. Hidajat 8 June 1971

0560 UBV PHOTOMETRY OF BM Cas D.S. Hall 9 June 1971

0561 PHOTOMETRIC OBSERVATIONS OF YZ CANIS MINORIS AND AD LEONIS A.H. Jarrett, J.P. Eksteen 9 June 1971

0562 NEW BRIGHT SOUTHERN VARIABLE STARS W. Strohmeier 26 June 1971

0563 VARIABLE 14 IN THE GLOBULAR CLUSTER M5 W. Osborn 26 June 1971

0564 ON THE APPARENT NON-VARIABILITY OF ADS 9975 A.U. Landolt 26 June 1971

0565 PRELIMINARY NOTE ON V1057 CYGNI AND SOME OTHER SIMILAR OBJECTS G. Haro 28 June 1971

0566 ON THE DISTRIBUTION OF FLARE STARS IN THE PLEIADES CLUSTER P.N. Kholopov 6 July 1971

0567 PHOTOELECTRIC OBSERVATIONS OF TX CANCRI M. Kitamura, A. Yamasaki 8 July 1971

0568 V1057 CYGNI L.J. Robinson, M. Harwood 15 July 1971

0569 HD 34409 - A SUSPECTED NEW VARIABLE STAR R.W. Hilditch 15 July 1971 0570 IDENTIFICATION AND SPECTRUM OF THE NEW VARIABLE IN SERPENS D.J. MacConnell 15 July 1971

0571 ABOUT THE VARIABILITY OF THE ECLIPSING VARIABLE STAR NQ Her C. Blanco 30 July 1971

0572 CONCERNING VARIABLE 14 IN M5 C. Coutts OBSERVATIONS OF VARIABLES ON SONNEBERG PLATES E. Splittgerber 30 July 1971

0573 MINIMA OF ECLIPSING VARIABLES Z. Klimek 12 August 1971

0574 THE PERIOD OF MW PAVONIS R.M. Williamon 14 August 1971

0575 THE PERIOD OF AQ TUCANAE Th.F. Collins 23 August 1971

0576 HD 101799, A COMPLETELY ECLIPSING W UMa SYSTEM R.F. Sistero, M.E. Castore de Sistero 24 August 1971

0577 A RESEARCH PROGRAM ON SOUTHERN RED DWARFS S.F. Mello, C.A.O. Torres 6 September 1971

0578 UBV PHOTOMETRY OF THE SUSPECTED VARIABLE BD +18d4586 R.C. Tate, E.W. Burke, Jr. NOTES ON VARIABLES E. Splittgerber 6 September 1971

0579 ORION FLARE STARS IN FEBRUARY 1971 A.N. Kulapova 9 September 1971

0580 HDE 302013 - A NEW SHORT-PERIOD VARIABLE STAR R.S. Cannon, O.J. Eggen 15 September 1971

0581 V1057 CYGNI G. Welin 18 September 1971

0582 PHOTOELECTRIC AND SPECTROGRAPHIC OBSERVATIONS OF THE ECLIPSING VARIABLE SZ CAMELOPARDALIS M. Kitamura, A. Yamasaki 21 September 1971

0583 ACCURATE POSITION AND PRE-NOVA IDENTIFICATION FOR NOVA CEPHEI 1971 G.K. Walker, Marcia J. Keyes 22 September 1971 0584 MINIMA OF ECLIPSING VARIABLES P. Flin 28 September 1971

0585 ELEMENTS AND CURVES OF THE TWO INFRARED VARIABLES MO AND MP CASSIOPEIAE L. Rosino, D. di Martino 18 October 1971

0586 NEW BRIGHT SOUTHERN VARIABLE STARS R. Bloomer 19 October 1971

0587 ELEMENTS OF TWO BAMBERG VARIABLES R. Bloomer 19 October 1971

0588 HD 184077: ANOTHER RED VARIABLE M. Wisse 20 October 1971

0589 OBSERVATIONS OF BV 1041 L. Plaut 22 October 1971

0590 NOTE ON LMC VARIABLE STARS P.W. Hodge, F.W. Wright 26 October 1971

0591 TESTS OF TWO SUSPECTED VARIABLES M.A. Seeds "FLARES OF RED DWARF STARS" - AN ANNOUNCEMENT 30 October 1971

0592 ONE NEW AND FOUR UP-DATED VARIABLE STARS D. Hoffleit 12 November 1971

0593 VARIABLE RADIO OBJECT 20.08.01 W. Wenzel 12 November 1971

0594 7 NEW VARIABLE STARS IN NGC 1261 C. Bartolini, F. Grilli, J.W. Robertson 24 November 1971

0595 I.A.U. COLLOQUIUM (NO.21) ON VARIABLE STARS IN GLOBULAR CLUSTERS AND IN RELATED SYSTEMS M.W. Feast 29 November 1971

0596 THE ECLIPSING BINARY AB CASSIOPEIAE AS A DELTA SCUTI STAR P. Tempesti 2 December 1971

0597 FLARE MONITORING OF AD Leo R.B. Herr 2 December 1971

0598 FURTHER REMARKS CONCERNING VARIABLE 14 IN M5 W. Osborn 6 December 1971 0599 THREE SOMEWHAT OVERLOOKED FACETS OF VY CANIS MAJORIS L.J. Robinson 7 December 1971

0600 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR EV Lac DURING THE 1971 SEPTEMBER 11-27 INTERNATIONAL PATROL S. Cristaldi, M. Rodono 21 December 1971