PAGE i Z C A M E L O P A R D A L I S L I G H T C U R V E S 1 9 2 7 - 1 9 9 5 AAVSO MONOGRAPH 6 This monograph is dedicated to Martha L. Hazen in recognition of her service and many contributions to the Association. Prepared by Janet A. Mattei Elizabeth O. Waagen Benjamin D. Oppenheimer E. Grant Foster Funds for preparation and publication provided by Martha L. Hazen Clinton B. Ford Additional funds provided by AAVSO Members International Astronomical Union (IAU) ---------------------------------------------------------------------------- PAGE ii ISBN 1-878174-12-6 COPYRIGHT 1996 by the American Association of Variable Star Observers 25 Birch Street Cambridge, Massachusetts 02138 USA All rights reserved. All commercial use of any part of this book requires the written permission of the AAVSO. All non-commercial use by individuals and educators is granted without restriction. ----------------------------------------------------------------------------- PAGE iii TABLE OF CONTENTS Introduction v Observers of Z Camelopardalis vii Information on Z Camelopardalis x Key to Symbols x Historical Light Curve of Z Camelopardalis, 1927 - 1995 1 Light Curves of Z Camelopardalis, 1963 - 1995 2 ----------------------------------------------------------------------------- PAGE iv is blank ----------------------------------------------------------------------------- PAGE v Z CAMELOPARDALIS LIGHT CURVES, 1927 - 1995 Introduction AAVSO long-term light curves of variable stars contain crucial information that has a significant bearing on many outstanding questions in astrophysics. These light curves define the behavior of variable stars and provide basic sets of observations for multiwavelength data correlation, data analysis, and for checking theories and matching models. The monograph format enables us to present long-term variable star behavior, with each Monograph containing 20 or more years of computer-generated light curves on one star. Each Supplement to a Monograph continues the light curves of the same star, bringing them more up-to-date. Z Camelopardalis Light Curves, 1927 - 1995 AAVSO Monograph 6 contains light curves of the dwarf nova-type cataclysmic variable Z Camelopardalis from 1927 through December 1995. The AAVSO historical light curve of Z Camelopardalis from September 1927 through March 1995 (JD 2425126 - 2449808) is presented on page 1. This light curve has been included to give a more complete picture of Z Camelopardalis' behavior. The observations that comprise this light curve are visual and come from the AAVSO International Database and Archives. Of these data, those that have been published appear in Popular Astronomy, Volumes 35 - 43 (1927 - 1935); Harvard Annals, Volumes 104 - 107 and 110 - 116 (1935 - 1946); AAVSO Quarterly Reports 1 - 27 (1946 - 1961); and AAVSO Report 29 (1961 - 1963). Pages 2 through 61 contain computer-generated light curves from 1963 through December 1995, with each dot representing one observation. Observations are plotted Julian date versus magnitude, and the start of each year (January 1) is indicated along the upper axis. A scaled grid is provided to assist in determining the exact date and magnitude of any data point. Factual information on Z Camelopardalis and a Key to Symbols are given on page x. The observations in this monograph are the contributions of AAVSO members or observers in the United States and abroad. 411 observers have contributed 45,510 observations to the light curves from 1963 through 1995. The names and observer codes of these observers are given on pages vii through ix. Organizations whose members have contributed observations to the AAVSO either individually or through their organization are listed on page ix. Benjamin (Ben) D. Oppenheimer, high school summer intern at AAVSO in 1993, 1994, and 1995, worked with the observations of Z Camelopardalis from the AAVSO International Database and evaluated them for accuracy in order to analyze the star's longterm behavior. His initial work was presented at the AAVSO 83rd Annual Meeting in October, 1994, after which Ben worked with the data more and also prepared the historical light curve of Z Camelopardalis on page 1. This later work was presented at the AAVSO 84th Annual Meeting in October, 1995, and was published in Bulletin of the American Astronomical Society, Volume 27, 1399 (1995). In preparing the data for publication in this monograph, the data files evaluated by Ben were used. Each of the observations was further evaluated by my senior technical assistant Elizabeth O. Waagen and by me. Software used in evaluating and plotting the observations was developed by my technical assistant E. Grant Foster. The observations from 1963 through 1995 included in this monograph have been preserved on compact disc, cartridge, and printout. v ----------------------------------------------------------------------------- PAGE vi Electronic, diskette, or printout copies of observations for further analysis may be obtained by writing or sending email to the AAVSO Director at aavso@aavso.org. The data may also be retrieved for personal use (not for publication or distribution) from the AAVSO's ftp site: ftp.aavso.org (198.116.78.2) in /pub/monographs, or its home page: http://www.aavso.org. Acknowledgements We dedicate AAVSO Monograph 6 to Martha L. Hazen. Martha has graciously and cheerfully given much time and wisdom in her many years of service to the AAVSO, and has contributed generously towards the preparation of the AAVSO monographs and supplements. We extend our sincere thanks to her. We remember with special thanks Clinton B. Ford for his very generous contribution for the preparation of this and subsequent monographs and monograph supplements. Our sincere thanks go to AAVSO members and friends for their contributions to prepare these monographs and monograph supplements. We thank the International Astronomical Union (IAU) for their support of our monograph series and for the grant provided to the AAVSO to publish this and other monographs. We acknowledge with thanks the computer support of the Smithsonian Astrophysical Observatory for the processing of part of the data and data preservation. The evaluation of the data and the preparation of this monograph supplement were accomplished using the computer facilities at AAVSO Headquarters. This computer hardware was purchased through grants from the National Aeronautics and Space Administration (grant awards NAGW 1493 and NAG 5-1459), the Kenilworth Fund, and the Theodore H. Dunham Fund for Astrophysical Research. We gratefully acknowledge these grants. Many AAVSO assistants helped in the preparation of the data for publication. My special thanks go to Benjamin D. Oppenheimer for extracting the observations from the AAVSO International Database and evaluating them initially, to Elizabeth O. Waagen for her careful evaluation of the observations and plotting the light curves, and to E. Grant Foster for developing the computer programs for the IBM-PC compatible MS-DOS computers at AAVSO Headquarters to evaluate, plot, and prepare the data for publication. Robert S. Hill, Charles M. Jones, and Richard J. Strazdas assisted in the initial development of the computer programs to manage the large volumes of data. Barbara Silva, Donna Eldridge, Douglas Van Orsow, Young Lim, Michael Bickford, and several other student-assistants have helped in making the data computer-readable. The dedication, the many, many hours of observing, and the untiring efforts of our observers in pursuit of contributing to variable star astronomy have made this publication possible. Our very sincere thanks and gratitude go to them for their valuable astronomical contributions. Janet Akyuz Mattei Director Cambridge, Massachusetts April 1996 vi ---------------------------------------------------------------------------- PAGE vii CONTRIBUTORS TO AAVSO DATA ON Z CAMELOPARDALIS 1963 - 1995 AAP ABBOTT, A. PATRICK 9 | COK COOK, RYAN D. 5 | AD ADAMS, ROBERT M. 3 | CK COOK, STEPHEN P. 36 | AG ALLIN, ROBERT 2 | CSD COSTANZO, DANIEL 19 | ALN ALLISON, RUDIE J. 4 | CR CRAGG, THOMAS A. 77 | AOD ANDERSEN, ODD'IVAR 42 | CSM CSUKAS, MATYAS 7 | AC ANDERSON, CURTIS E. 707 | CCO CUBILLO, CARLOS F. 4 | ASR ANDERSON, STERLING 86 | DAH DAHLE, HAAKON 3 | AJR ANDRESS, J. ROBERT 45 | DAK DANSKIN, KEITH H. 4 | ANN ANNAL, ROBERT J. 389 | DTA DARVANN, TRON A. 1 | ARI ARIAIL, ROBERT B. 229 | DMT DE MENTEN, TH. 8 | ACP ARMSTRONG, C. PETER 2 | DEY DE YOUNG, JAMES A. 413 | BOZ BAGO, BALAZS 7 | DBF DEBOOSERE, FRANK 4 | BTR BAKER, TIM R. 51 | DES DECEUNINCK, STEFAAN 15 | BM BALDWIN, MARVIN E. 2 | DJO DEJONG, J. 1 | BJ BANKS, JAMES 39 | DEA DEMARTINO, ROBERT 1 | BWK BARKSDALE, WILLIAM 16 | DEK DEQUICK, KURT 25 | BSF BARNHART, STEPHEN 17 | DTE DESLIJPERE, TOMMY 9 | BXR BARRY, RON 9 | DPA DIEPVENS, ALFONS 766 | BAU BAUER, JOHANN 337 | DMN DIERICK, DOMINIQUE 59 | BKK BECKMANN, KENNETH 63 | DRG DIETHELM, ROGER 128 | BTY BENNER, TERRY 1 | DLA DILL, ALBERT G. 2 | BEB BERG, RAYMOND 2 | DZM DONZEL, MARC 1 | BEG BERGER, L. 7 | DRY DUCOTY, RICHARD B. 23 | BML BERNSTROM, MARVIN 62 | DUR DURUY, MAURICE V. 37 | BVA BERVALD, ASSAF 1 | DGP DYCK, GERALD P. 2068 | BJZ BEST, JANET 1 | ECJ ECKENDORF, JAMES H. 9 | BIC BICHON, LAURENT 73 | ECK ECKERT, CHRISTOPH 60 | BMM BIESMANS, MARC 1 | EDG EDGERTON, BRIAN J. 1 | BIL BILODEAU, GERALD A. 2 | EWH EDWARDS, WILLIAM H. 2 | HUO BLOOM, DONNA J. 7 | EIE EIERS, CHARLES J. 2 | BOH BOHME, DIETMAR 3 | EJT EMMERT, JOHN T. 25 | BOD BOHN, DENNIS 59 | ED ENGELKEMEIR, DONALD 7 | BFK BOINCK, FRANK 23 | EKS ERIKSSON, SOREN 5 | BOI BOIS, BERNARD 121 | EJL EVERAERT, JEAN-LUC 16 | BYR BONDONO, JEFFERY R. 34 | FCA FAUSEL, CHARLES A. 22 | BOR BORNHURST, LARRY 2 | FJH FEIJTH, HENDRIK 743 | BRJ BORTLE, JOHN E. 1953 | FE FERNALD, CYRUS F. 343 | BMU BOUMA, R. J. 464 | FET FETTERMAN, THOMAS 35 | BAV BREIVIK, ASBJORN 1 | FRF FIDRICH, ROBERT 113 | BMS BREMSETH, PER-JOHNNY 4 | FSJ FIS, JEAN-LOUIS 7 | BHN BRIL, HENK 2 | FDV FISHER, DAVID A. 33 | BSM BRINCAT, STEPHEN M. 68 | FEM FLYNN, EDWARD M. 77 | BAA BRITISH ASTRONOMICAL ASS'N 125 | FFC FOLDESI, FERENC 1 | BOS BROENS, ERIC 96 | FD FORD, CLINTON B. 44 | BBM BROWN, BUCK M. 11 | FRH FRICH, ARNAND 26 | BBT BROWNING, ROBERT R. 3 | FRI FRIGON, LEON A. 3 | BRY BRYAN JR., JAMES T. 44 | GBZ GABZO, OFER 328 | BYD BRYDEN, ROBERT K. 164 | GAE GAERTNER, ELKE 4 | BZB BRYLOWSKI, ZBIGNIEW 6 | GAY GAYDOS, MARK 20 | BUO BUENO, ANTONIO T. 12 | GJN GENSLER, JAN 12 | BUW BUHROW, ROSS 22 | GSR GESCHWIND, RALPH 10 | BDH BULDER, H. J. J. 1 | GDI GILL, DAVID P. 2 | BCN BURRELL, C. M. 7 | GOP GOODWIN, PAUL N. 27 | BTH BURROWS, THOMAS A. 65 | GGH GOUGH, THOMAS 2 | CMP CAMPBELL, RICHARD 7 | GDP GRANAUD, PIERRE 1 | CWA CAMPNEY, WALTER 132 | GRL GRANSLO, BJOERN H. 683 | CIA CAMURRI, LUCA 5 | GRW GREEN, DANIEL W. E. 1 | CEA CANDELA, BERNARD 59 | GRI GRIESE III, JOHN W. 340 | CTB CARTER, BRIAN A. 59 | GCT GRUNNET, CARL 408 | CNT CHANTILES, DEAN 5 | GRZ GRZELCZYK, HEINZ 260 | CGF CHAPLE JR., GLENN 606 | GUB GUBBELS, GUIDO 53 | CRK CHILDRESS, R. KEN 1 | GHD GUIDRY, HOWARD 24 | CHI CHIPMAN, RUSSELL 1 | GUN GUNTHER, JEAN 532 | TCE CIFUENTES-TORRES, EDUARDO 32 | HTY HAGER, TIMOTHY 27 | CIR CINTRON, ROBERT 4 | HK HALBACH, EDWARD A. 143 | CCR COCHRAN, HARRY F. 23 | HAN HANNON, JAMES 7 | COL COLLINS, PETER L. 55 | HSG HANSON, GENE 140 | CMG COMELLO, GEORG 253 | H HARTMANN, FERDINAND 16 | CGG CONLIN, GREGORY 1 | HAV HARVAN, RICHARD P. 104 | COO COOK, LEWIS M. 14 | HAY HAYDEN, EDWARD R. 2 | HAB HAYS JR., ROBERT H. 477 HZL HAZEL, LAWRENCE 43 HY HEASLEY, ALAN S. 7 HEF HEIFNER, MARK A. 312 HEE HEISER, ERWIN 38 HEY HEYNDRICKX, BRUNO 5 HE HIETT, F. LANCASTER 136 HRI HILL, RICHARD E. 103 HWD HODGSON, WILLIAM D. 6 HJO HOLTROP, J. 58 HOH HONDA, HIDEO 25 HOO HOOGEVEEN, GEERT 7 HOP HOPP, ULRICH 18 HSF HOSSFIELD, CASPER 57 HSR HOSTE, SERGE 13 HU HOUSTON, WALTER S. 1 HUB HUBBARD, RUSSELL 17 HDB HUDGENS, BEN 1 HUH HUGHES JR., HARRY 3 HR HURLESS, CAROLYN J. 2496 HUR HURST, GUY M. 1 HTD HUTTER, DONALD J. 2 IML IDEM, MICHAEL 664 ILS ISLES, JOHN E. 3 JM JAMES, ROBERT A. 35 JLT JENSEN, LASSE TEIST 222 JRJ JOHANNS, R. J. 3 JOG JOHNSON, GUS E. 1 JR JOHNSSON, ROBERT G. 14 JON JONCKHEERE, KURT 4 JNM JONES, MICHAEL I. 3 JRR JURY, ROGER 1 KB KAMINSKI, WALTER J. 1 KPS KANE, PHILLIP 2 KLY KELLEY JR., GEORGE 519 KEK KELLY, KEN 1 KTY KESLER, TERRY 1 KRB KING, ROBERT P. 13 KIR KIRBY, PHILLIP E. 5 KBS KIRBY-SMITH, HENRY 3 KHT KLINTENS, HENNY 1 KON KLINTING, OLE 31 KGT KNIGHT, GEORGE 1 KSP KNIGHT, STEPHEN P. 50 KOJ KNOX, OSWALD J. 261 KOC KOCSIS, ANTAL 8 KKF KOEHLER, KARL F. 113 KHL KOHL, MICHAEL 34 KRS KOLMAN, ROGER S. 2 KMA KOMOROUS, MIROSLAV 79 KRF KONIOR, ROBERT F. 1 KRT KORTH, STEFAN 19 KOS KOSA-KISS, ATTILA 6 KKO KOSS, K. 3 KVI KOVACS, ISTVAN 1 KWO KRIEBEL, WOLFGANG 140 KPG KUIPERS, GAUKE 65 LGT LACASSIN, GILBERT 55 LBT LAMBERT, MIKE 1 LAR LAMBERT, RANDY 1 LGU LAMBRECHTS, GUY 9 LND LANDIS, HOWARD J. 2 LGH LANGE, HERBERT A. 113 LTW LANGHANS, THOMAS W. 33 LKG LARSON, KEVIN GARY 60 LAB LAURENT, BERGER 6 LDR LAURENT, DIRK 2 LVA LAUVSTAD, ANDREAS 24 LTF LEIFSEN, TORBEN 1 LVY LEVY, DAVID H. 120 vii ----------------------------------------------------------------------------- PAGE viii CONTRIBUTORS TO AAVSO DATA ON Z CAMELOPARDALIS (continued) 1963 - 1995 LNB LINDBLOOM, GEORGE 253 | ORB OLSEN, ROBERT 2 | LJK LINGAAS, JACOB 47 | OJR OSORIO, JOSE RIPERO 492 | LI LIVINGSTON, DONALD 2 | PAS PADILLA, STEPHEN 7 | LWT LOHVINENKO, TODD W. 1 | PPS PAPP, SANDOR 7 | LVT LOVETT, JAMES 259 | PLI PARMEGGIANI, LIONEL 9 | LX LOWDER, WAYNE M. 354 | PRN PATRICK, RAYMOND M. 46 | LW LOWRY, WILLIAM I. 25 | PCE PEARCE, ERIC C. 2 | LBG LUBCKE, GILBERT C. 566 | PEI PEDERSEN, EIGIL 89 | LS LUCAS, DIANE 233 | P PELTIER, LESLIE C. 1460 | LKS LUKAS, RAINER 3 | PMR PERALA, MARTTI R. 280 | MJM MAJOR, M. H. 6 | PRZ PEREZ, A. ARMANDO 8 | MLT MALLAMA, ANTHONY 1 | PZA PEREZ-REVILLA, ALAIN 366 | MMK MALMROS, MARK K. 6 | PED PETTENGILL, DWYNAL 74 | MKE MANSKE, ROBERT P. 22 | PIA PIEMONTE, ANTONELLA 23 | MJZ MANZORRO, JUAN 21 | PTZ PIETZ, JOCHEN 147 | MCO MARCARIO, MIKE 6 | PBE PIOLON, BENGT 3 | MYA MASSEY, ANDREW 1 | PLS PLESIER, GHISLAIN 2 | MTO MATEO, MARIO 12 | PTP POITEVIN, PATRICK 1 | MTH MATSUYAMA, HIROSHI 38 | PLR POOLE, RANDALL M. 1 | MPR MAURER, PETER 36 | PO POWELL, EUGENE A. 67 | MGE MAVROFRIDIS, GEORGE 6 | POX POXON, MICHAEL 201 | MYW MAYER JR., ERNST W. 68 | PYG POYNER, GARY 245 | MYR MAYER, ERNST H. 1204 | PTF PTACEK, KIM E. 1 | MJW MAYER, JAY W. 124 | PUJ PUJOL, FRANCISCO 3 | MDO MCDODONALD, JAMES 1 | RRB RAPHAEL, ROBERT B. 1 | MGG MCGINNIS, GARY L. 11 | RCJ RENNER, CARL J. 3 | MCI MCINNERNY, BRIAN J. 2 | RNN RENNER, THOMAS 1 | MKJ MCKENNA, JEROME F. 131 | RIR RIETH, RALPH 46 | MBC MCMILLAN, BETTY P. 77 | RJI RIGGS, JOHN I. 112 | MIB MEDIAAS, IVAR B. 13 | RPR ROBBINS, PHILLIP 147 | MED MEDWAY, KENNETH J. 946 | RAR ROBOTHAM, ROBERT A. 63 | MDG MEGGINSON, DAVID L. 29 | ROR RODGER, DAVID A. 1 | MJL MENDEZ-ALVAREZ, JAVIER 1 | RSS ROESS, STEVEN T. 3 | MMY MEYER, MAIK 23 | RGL ROTEM, GILAD 24 | MDI MIDDLEMIST, IAN A. 4 | RWL ROWLEY, DENNIS A. 2 | MOK MIDTSKOGEN, ORNULF 809 | RR ROYER, RONALD E. 40 | MTL MILTON, RUSSELL E. 10 | SAB SABINE, KENNETH M. 58 | MJI MINER, JAMES R. 6 | SKM SAKARIAS, MICHAEL 1 | MIS MINOIS, JOEL 198 | SAH SAMOLYK, GERARD 4 | MZS MIZSER, ATTILA 53 | SNL SANDEL, JEFF G. 16 | MRV MODIC, ROBERT J. 344 | SGE SARTY, GORDON 3 | MMI MOELLER, MICHAEL 541 | SHL SCHALTEGGER, ERNST 2 | MGJ MOGELINSKI, JERRY 2 | SRW SCHAUPP, RICHARD W. 1 | MOL MOLNAR JR., JAMES 4 | SPK SCHMEER, PATRICK 200 | MAR MONELLA, RINALDO 2 | SV SCHMITZ, VICKI 2 | MOR MONSKE, ROBERT L. 6 | SCZ SCHWEITZER, EMILE 332 | MJ MONTAGUE, ALLEN C. 826 | SCE SCOVIL, CHARLES E. 304 | MF MONTAGUE, FREDERICK 3 | SEZ SEGONZAT, JACQUES 1 | MOJ MORGAN, JAMES E. 142 | SHS SHARPE, STEVEN B. 156 | MOI MORILLON, ERIC 41 | SHQ SHEMMER, OHAD 37 | MRR MORRIS, CHARLES S. 1 | SLH SHOTTER, LAWRENCE 33 | MRO MORRISON, PATRICK 6 | SIH SILHOL, MAX 172 | MOW MORRISON, WARREN C. 1 | SNE SIMMONS, NEIL A. 6 | MUR MURN, PAUL 5 | SKP SKALAK, PETR 3 | MU MURPHY, A. THOMAS 1 | SLO SLOCUMB, ROBERT C. 1 | MUM MURPHY, MIKE 9 | SMI SMITH, ALAN L. 13 | MUY MUYLLAERT, EDDY 3 | SMH SMITH, C. J. 1 | NRH NELSON, ROBERT 10 | SDU SMITH, DOUGLAS 1 | NM NEWBERRY, MARK 3 | STL SMITH, MICHAEL B. 145 | NBY NORDBY, JOHN M. 22 | SJZ SPEIL, JERZY 235 | NN NORDEN, RODNEY A. 1 | SC SPRATT, CHRISTOPHER 228 | NVK NOVAK, MICHAEL 8 | STR STANTON, RICHARD H. 1 | OCN O'CONNOR, STEPHEN 1 | SKS STECKNER, THOMAS 4 | OF OBERSTATTER, ALPHONSE 32 | STI STEFFEY, PHILIP C. 168 | OER OFEK, ERAN 16 | SPU STEPAN, PETR 43 | OGR OGDEN, RICHARD H. 5 | SLW STEVENS, LESLIE 1 | OJO OLESEN, J. OSTERGAARD 157 | SWT STEWART, ROBERT J. 195 | STQ STOIKIDIS, NIK 2 SUL SULLIVAN, CHARLES 78 SUR SURAWSKI, URSULA E. 55 SVN SVENTEK, PAUL L. 210 SSW SWIERCZYNSKI, STANISLAW 10 SBT SZABO, ROBERT 63 SKV SZARKA, LEVENTE 43 SZG SZEGEDI, BELA 3 SNO SZENTASKO, LASZLO 1 SKB SZOKE, BALAZS 2 SOO SZOLLOSI, ATTILA 4 TB TABOADA R., DOMINGO 25 TPI TASSIE, PIERRE 9 TDB TAYLOR, DANIEL 67 TAY TAYLOR, PETER O. 1 TBA TEKATCH, BARBARA 1 TM THOMAS, HOWARD D. 7 TJ THOMAS, JAMES 160 TMR THOMAS, RONALD P. 1 THU THOUET, BERNARD 11 TOO TOONE, JOHN 11 TTH TOTH, TAMAS 1 TDM TROIANI, DANIEL M. 4 TRR TROMMER, DIRK 11 TSJ TSUJI, SEIJI 3 VCP VAN CAUTEREN, PAUL 3 VER VAN DER ENDE, BARRY 10 VDE VAN DIJK, E. 17 VNL VAN LOO, F. R. 397 VDL VANDERLOVY, JOHAN 19 VDJ VANDIJK, J. F. H. 67 VHD VANHESSCHE, DIRK 1 VMT VANMUNSTER, TONNY 28 VED VEDRENNE, PAUL 897 VET VERDENET, MICHEL 1151 VGJ VINCI, GREGORY J. 2 VIS VISOCKI, GARY 15 VFK VOHLA, FRANK 13 VLJ VOLHARD, JAMES 12 VOL VOLLMANN, WOLFGANG 31 VYP VUYLSTEKE, PIETER 2 WND WALLIAN, DENIS 4 WAB WARNER, BRIAN D. 6 WNF WASSON, NORMAN F. 3 WBB WEBB, WILLIAM V. 199 WER WEBER, RICHARD J. 32 WEI WEIER, DAVID D. 73 WC WEND, RICHARD E. 2 WEM WESOLOWSKI, MIKE 23 WTJ WEST, JOHN 4 WDM WESTLUND, MARGARETA 262 WJ WHITEHEAD, JAMES M. 4 WLM WILLIAMS, THOMAS R. 1 WJY WILMS, JOHNNY 3 WLP WILS, PATRICK 279 WDN WILSON, DANNY RAY 32 WSN WILSON, THOMAS W. 14 WNB WINGATE, BRUCE I. 43 WTN WITTEN, BLAKE C. 5 WHR WOHLEVER, RICHARD 13 WRO WRIGHT, ROBERT 5 WU WUNDERLICH, MAURICE 1 YRK YORK, DAVID O. 563 ZLT ZALEZSAK, TAMAS 1 ZMM ZIMMERMAN, DENNIS 9 ZRE ZISSELL, RONALD E. 27 ZT ZIT, RAYMOND E. 3 viii ----------------------------------------------------------------------------- PAGE ix CONTRIBUTORS TO AAVSO DATA ON Z CAMELOPARDALIS (continued) 1963 - 1995 CONTRIBUTING ASTRONOMICAL ORGANIZATIONS Agrupacia Astronomica Albireo of Seville (Spain) Asociacion Argentina Amigos de la Astronomia Association Francaise des Observateurs d'Etoiles Variables (France) Astronomical Society of Southern Africa, Variable Star Section Astronomischer Jugendclub (Austria) Astronomisk Selskab (Scandinavia) British Astronomical Association, Variable Star Section (England) British Astronomical Association of New South Wales (Australia) Bundesdeutsche Arbeitsgemeinschaft fur Veranderliche Sterne e.V.(BAV) (Germany) Grupo Astronomico Silos (Zaragoza, Spain) Grupo Canario de Estrellas Variables (Canary Islands, Spain) Israeli Astronomical Association, Variable Star Section Madrid Astronomical Association M1 (Spain) Liga Ibero-Americana de Astronomia (South America) Magyar Csillagaszati Egyesulet, Valtozocsillag Szakcsoport (Hungary) Nederlandse Vereniging Voor Weer-en Sterrenkunde, Werkgroep Veranderlijke Sterren (Netherlands) Norsk Astronomisk Selskap, Variable Stjernegruppen (Norway) Planetario e Observatorio Astronomico do Colegio Estadual do Parana (Brazil) Red de Observatores de Estrellas Variables - MIRA (Spain) Royal Astronomical Society of Canada Royal Astronomical Society of New Zealand, Variable Star Section Sociedad Astronomica 'Syrma' (Valladolid, Spain) Svensk Amator Astronomisk Forening, variabelsektionen (Sweden) Uniao Brasileira deAstronomia, Variable Star Commission (Brazil) Unione Astrofili Italiani (UAI) Variable Star Observers League in Japan Vereniging Voor Sterrenkunde, Werkgroep Veranderlijke Sterren (Belgium) ix ----------------------------------------------------------------------------- PAGE x INFORMATION ON Z CAMELOPARDALIS Right Ascension Declination Position: (1900) 08h 14m 02s +73 degrees 25.8' (1950) 08 19 40 +73 16.4 (2000) 08 25 14 +73 06.7 Type: Cataclysmic variable - prototype of Z Camelopardalis-type dwarf nova, which shows standstills (halts in the normal decline about one-third of the way to maximum) than can last from weeks to years. Average Outburst Frequency: 25.7 days Orbital Period: 6.956 hours Spectrum (secondary): Pec(UG)+G1 Mass Ratio (primary/secondary): 1.41 +/- 0.20 Mass (primary): 0.99 +/- 0.15 solar mass Mass(secondary): 0.70 +/- 0.03 solar mass Orbital Inclination: 57 degrees Other Information: X-ray source (hard and soft x-ray) KEY TO SYMBOLS Symbols used in this monograph are: . = 1 visual observation v = variable is fainter than the magnitude indicated by the vertex of the "v" on the light curve (variable not seen) Please note that there may appear to be horizontal lines in some parts of the light curves. These "lines" are in fact very dense concentrations of individual observations. x ----------------------------------------------------------------------------- PAGE xi Z CAMELOPARDALIS LIGHT CURVES 1927 - 1995 ----------------------------------------------------------------------------- PAGE 1 Caption for long-term light curve AAVSO light curve of 0814+73 Z Camelopardalis 1927 - 1995 (JD 2425126 - 2449808). Data are visual and are from the AAVSO International Database and Archives. See Introduction for publication information. ---------END OF FILE----------------------------------------------------------