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Astrophysics Publications of the Astronomical Institute rais-mf—ii«o of the Czechoslovak Academy of Sciences Publication No. 70 EUROPEAN REGIONAL ASTRONOMY MEETING OF THE IA U Praha, Czechoslovakia August 24-29, 1987 ASTROPHYSICS Edited by PETR HARMANEC Proceedings, Vol. 1987 Publications of the Astronomical Institute of the Czechoslovak Academy of Sciences Publication No. 70 EUROPEAN REGIONAL ASTRONOMY MEETING OF THE I A U 10 Praha, Czechoslovakia August 24-29, 1987 ASTROPHYSICS Edited by PETR HARMANEC Proceedings, Vol. 5 1 987 CHIEF EDITOR OF THE PROCEEDINGS: LUBOS PEREK Astronomical Institute of the Czechoslovak Academy of Sciences 251 65 Ondrejov, Czechoslovakia TABLE OF CONTENTS Preface HI Invited discourse 3.-C. Pecker: Fran Tycho Brahe to Prague 1987: The Ever Changing Universe 3 lorlishdp on rapid variability of single, binary and Multiple stars A. Baglln: Time Scales and Physical Processes Involved (Review Paper) 13 Part 1 : Early-type stars P. Koubsfty: Evidence of Rapid Variability in Early-Type Stars (Review Paper) 25 NSV. Filtertdn, D.B. Gies, C.T. Bolton: The Incidence cf Absorption Line Profile Variability Among 33 the 0 Stars (Contributed Paper) R.K. Prinja, I.D. Howarth: Variability In the Stellar Wind of 68 Cygni - Not "Shells" or "Puffs", 39 but Streams (Contributed Paper) H. Hubert, B. Dagostlnoz, A.M. Hubert, M. Floquet: Short-Time Scale Variability In Some Be Stars 45 (Contributed Paper) G. talker, S. Yang, C. McDowall, G. Fahlman: Analysis of Nonradial Oscillations of Rapidly Rotating 49 Delta Scuti Stars (Contributed Paper) C. Sterken: The Variability of the Runaway Star S3 Arietis (Contributed Paper) S3 C. Blanco, A. Hamano, C. Baratta, R. Coluzzl, V. Croce, R. Margoni, R. Stagni, U. Hunari, I. 59 Dalaerl: Searching Relativist1c Stars Among 0-B Kunaways I. V568 Cyg - hO 197419 (Contributed Paper) M. Alvarez, D. Ballereau: 13-Color Photometry of HO 184279 (Poster Paper) 63 C.A. Oafcos, 3. Tremko: Photometric and Spectroscoplc Study of AZ Canls Hinoris (Paster Paper) 67 K. Pavlovski: A Hultlfrequency Analysis of the Short-Term Variable Be Star KY And (Poster Paper) 69 3. Zverko, 3. Ziznovsky, N. Zborll, L. Hrlc, N. Polosukhlna, V. Halanushenko, V. Bychkov, I. Iliev: 71 Search for Rapid Variability In Spectna of Alpha Andromedae (Poster Paper) Part 2: Late-type stan O.S. Hall: Variability In CnroBospherlcally Active Stars - At All Tine Scales (Review Paper) 77 N. Bodono: Stellar Activity (Revle> Paper) 89 F. Sealtrltl, H. Busso, L. Corclonai Rapid Tlae Variability In the Short-Period RS CVn-Type Binary 91 SV Canelopardalla (Contributed Paper) K. Olid, L. Gesztelyl, A. Holl: Starapot Proper Motion In HK Lac (Contributed Paper) 95 F. Glovannelli, A.A. Vlttone, L. Errlco, C. Rossi: Energy Distribution Monitoring of the T Tauri 99 Star RU Lupi (Poster Paper) B. Clebockl, E. Blelicz, Z. Pastuszka, 3. Slkorski: A Search of Tidal Interaction In the Binary 103 Systea Laabda And (Poster Paper) P. Rovlthis, H. Rovlthls-Llvanlou: Flare Activity On HD 12211 (Poster Paper) 107 Part 3tlligilei and) Multiple systems 3. van Paradljs: Fast Variability In Low-Mass X-Ray Binaries (Review Paper) 113 P. Hamanec, G.N. Hill, G.A.H. Walker, N. Dinshaw, S. Yang: Is Oaicron Andranedae a Quadruple 115 Or Even Quintuple Systea? (Contributed Paper) O.E. Aab: Rapid Spectral Variability of Massive X-Ray Binaries and Runaways (Poster Paper) 121 A.E. Tarasov, I. Tuoalnen: Duplicity of the Be-Star 59 Cyg (Poster Paper) 127 Part *:Theoretical considerations A. Noelst Theoretical Aspects of Non Radial Pulsations (Review Paper) 133 N. Auvergne, A. Baglln: Soae Characterization of a Nonlinear Dynamic In Variable Stars (Poster 145 Paper) M.3. Goupll, 3.R. Buchler, G. Kovacs: A Possible Explanation of the Occurence of Irregularities 149 In Pulsating Stars (Poster Paper)• F. Verheests Discussion of Nonlinear Interaction Models For Stellar Pulsations (Poster Paper) 153 H. Klrblylk: Radial Pulsations And Vlbrational Instability of Massive Stars (Poster Paper) 157 I.L. Andronov: Smoothing the "Smoothing" Cubic Spline Functions (Poster Paper) 161 P. Hamanec: On the Social Behaviour of Stellar Astronomers During Astronomical Meetings (Poster 165 Paper) P a r t 5 : P a n e1 discussion P. Harnanec: Introductory Comments To the Panel Discussion On Discrimination Between Various 171 Possible Causes of Rapid Variability In Stars Panel Discussion 176 i)l trivlolet stellar spectra A.A. Boyarchuk: UV Stellar Spectra - Some Basic AchleveMents (Review Paper) 185 M.3. Plavec: Ultraviolet Spectra of Algol Binaries (Review Paper) 193 R.S. Polidan: Far-Ultraviolet Astronomical Observations With the Voyager 1 and 2 Spacecraft 199 Contributed Paper) D. Chochol, Z. Komarek, A. Vittone: Ultraviolet Spectroscopy of the Symbiotic Star AC Pegasi 201 Contributed Paper) A. Talavera, A.I. .Gomez de Castro: Stellar Winds In A-Type Supergiants (Contributed Paper) 207 H.L. Halaghlnl, C. Horossl, L. Rossi, T. Valente: Calibrated IUE LHR Low Resolution Spectra of 211 ' G-'Type Stars (Contributed Paper; A.W.| Harris: Interstellar UV Lines (Rovlew Paper) 213 High-energy astrophysics G.F. Bignami, P.A. Caraveo: Is the Vela Pulsar Associated With the Vela SNR? (Contributed Paper) 223 P.A. Caraveo, G.f. Bignami, I. Mltrofanov, G. Vacant!: Search For Linear Polarization In Gamma-Ray 227 Sources! Possible Evidence For the Vela Pulsar (Contributed Paper) R. Hudec, 3. Borovicka, R. Peresty, B. Valnicek: Search For Optical Flashes From Gamma-Ray Burst 239 Sources (Contributed Paper) W. Gbtz: Optical Study of X-Ray Sources And Search For Optical Counterparts of Gamma-Ray Burst 241 Sources At Sonneberg Observatory (Contributed Paper) E. V/oyk (Chvojkova): Gravitomagnetic Explanation of Cosmic Phenomena Without Using Computers II. 243 Streaming of Plasma Along Field Lines After an Impact - Even Without Any Energy Supply Contributed Paper) Binary stars C. de Loore: Binary Evolution^Review Paper) 251 P. Hadrava: Model Atmospheres of Binary Components (Review Paper) 263 F. Barone, S. Mancuso, L. Hilano: UBV Light Curve Solutions of TT Her (Contributed Paper) 267 G. DJurasevic: Light Curve Variabilities of Close Binaries (Contributed Paper) 271 V.G. Karetnikov: Spectral Investigation of Eclipsing Binary Stars At the 5tage of Mass Exchange 273 (Contributed Paper) T.fi. Horak, D. Chochol: TW Casslopeiae - an Algol-Type Binary (Contributed Paper) 277 A.Abad, 3.A. Docobo, A. Ellpe: Some Methods For Solving Visual Double Star Orbits With Inclination 281 Fqual To 90° (Contributed Paper) P. Paolicchi, M. Alongi, M. Fofl, M. Scardia: Statistical Properties of Visual and Eclipsing 285 Binaries (Poster Paper) P. Paolicchi, M. Bellesl, F: Ferrini, M. Boss!: The Role of Angular Momentum Transfer To Determine 289 the Mass Ratio of Binaries (Poster Paper) R.S. Polidan: Luminous Accretion Disks And High Ionization Emission Lines In Interacting Binaries 293 (Review Paper) S. Kriz: Models of Accretion Disks In Interacting Binaries (Review Paper) 295 M.3. Plavec: On the Nature of the Component Stars In Beta Lyrae (Review Paper) 301 D.L. Dlmitrov: On the Non-LTE Analysis of the He I Lines In the Atmosphere of Beta Lyrae (Poster 307 Paper) P.L. Selvelli, R. Vlotti: The UV Spectra of Cataclysmic And Symbiotic Binaries (Review Paper) 311 A. Skopal, H. Mikolajewski, R. Biernlkowicz: Radiation of the Symbiotic Star CH Cygni In the Period 317 1982 - 3uly 1984 (Poster Paper) L. Hrlc: Chemically Peculiar Binary Onega UMa With Elliptical Orbit (Contributed Paper) 321 I. Kudzej: On the Possibility of Taking Into Account the Electromagnetic Radiation In the 325 Atmospheres of Close Binary Stars (Poster Paper) B. Onderlicka, D. Handlifova: The Spectroscopic Binary XI Cygni (Poster Paper) 331 S.-Y. 3iang: The Binary Model of HD 94033 And the Physical Nature of Dwarf Cepheid (Poster Paper) 333 Index of Authors 337 II PREFACE The Tenth European Regional Meeting of the IAU we held in Prague, Czechoslovakia from August 2* to 29, 1987. The meeting was attended by 387 European as well as non-European astronomers. Basic information, including the list of participants, the scientific programme of all conferences and the directory to the whole meeting can be found in a special Volume of the Proceedings (Publications of the Astronomical Insti- tute of the Czechoslovak Academy of Sciences No. 65). The present Volume of the Proceedings covers the scientific programme of several different meetings of stellar astronomers, which took place during the Prague Regional IAU Meeting, namely: 1. The invited discourse FROM TYCHO BRAHE TO PRAGUE 1987: THE EVER CHANGING UNIVERSE delivered by Dean-Claude Pecker; 2. Workshop RAPID VARIABILITY OF SINGLE, BINARY AND MULTIPLE STARS, which consisted of five morning sessions; 3. One afternoon session on ULTRAVIOLET STELLAR SPECTRA introduced by an invited paper delivered by A.A. Boyarchuk; *. One afternoon session devoted to HIGH-ENERGY ASTROPHYSICS and 5. Two afternoon sessions on BINARY STARS. Let me to say a few words about each of the conferences. The workshop on rapid variability of stars was prepared by the Scientific Organizing Panel (SOP here- after) consisting of the following scientists: A. Baglin, M. Breger, A. Cherepaschuk, M. Hack, P. Harmanec (Local Organizer), A. Hearn, H. 3erzykiewicz, and 3.-C. Pecker (Chairman). Very regrettably, only three members of this Panel succeeded to come to Prague. The central topic of the workshop was to seek the answer to the question how can one safely distin- qulsh between non-radial pulsations, rotating surface or near-surface inhomogeneities ("spots" and "spo- kes"), unrecognized duplicity (multiplicity) and other causes of rapid stellar variability in particular objects. Although - not very surprisingly - no definitive answer to this question was found during the meeting, a rather general agreement on the strategy and methodology of the future research in this area was achieved in my opinion, as well as a definite progress in sharper and more concise formulation of argu- ments for, and against each of the considered models. The SOP decided to ensure enough time for discussions during the meeting by admitting only invited contributions for the oral presentations.
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