INTERNATIONAL ASTRONOMICAL UNION
COMMISSIONS 27 AND 42
IVTH COLLOQUIUM ON VARIABLE STARS
HELD IN BUDAPEST, HUNGARY, 5-9 SEPTEMBER 1968
CHAIRMAN OF SCIENTIFIC ORGANIZING COMMITTEE:
G. H. HERBIG
(Lick Observatory)
NON-PERIODIC PHENOMENA IN
VARIABLE STARS
Edited by
L. DETRE
Konkoly Observatory, Budapest
1969
ACADEMIC PRESS - BUDAPEST
PREFACE
From September 5 until September 9, 1968, the IVth Colloquium on
Variable Stars was held in Budapest, Hungary. The Colloquium was
organized by a committee consisting of G. H. Herbig (President), A.
Boyarchuk, M. W. Feast, D. McNamara, J. E. Merrill, D. J. K. O'Connell,
V. Tsessevich, W. Wenzel.
The local organization was placed in the hands of a Committee consisting
of members of the Konkoly Observatory, Budapest: L. Detre (Chairman),
I. Almár, Julia Balázs-Detre, K. Barlai, M. Ill, S. Kanyó, M. Lovas and of
J. Kovács (Hungarian Academy of Sciences).
The Colloquium was attended by about 90 scientists representing
Argentina, Austria, Bulgaria, Canada, France, GDR, GFR, Hungary, Italy,
The Netherlands, Poland, Roumania, South Africa, Sweden, United Kingdom,
U.S.A., U.S.S.R.
As chairmen acted at the sessions: M. W. Feast, G. H. Herbig, J. Sahade,
A. Boyarchuk, W. Wenzel, F.B. Wood and L. Rosino.
The contents of the present volume parallel closely the programme of
the individual sessions of the Colloquium.
L. DETRE
PARTICIPANTS
ARGENTINA
DR. J. SAHADE, Observatorio Astronomico, La Plata
AUSTRIA
DR. P. L. FISCHER, Universitäts-Sternwarte Wien
DR. F. V. PROCHAZKA, Universitäts-Sternwarte Wien
DR. A. SCHNELL, Universitäts-Sternwarte Wien
BULGARIA
DR. B. KOWATCHEW, Section d'Astronomie, Sofia
DR. N. S. NIKOLOV, Dept. of Physics, Sofia
CANADA
Prof. G. A. BAKOS, University of Waterloo
C. COUTTS, David Dunlap Observatory
DR. J. D. FERNIE, David Dunlap Observatory
DR. J. B. HUTCHINGS, Dominion Astrophysical Observatory, Victoria
Prof. DR. H. B. SAWYER-HOGG, David Dunlap Observatory
CZECHOSLOVAKIA
DR. J. TREMKO, Skalnate Pleso Observatory
ENGLAND
DR. M. J. PENSTON, Royal Greenwich Observatory
DR. M. PENSTON, Royal Greenwich Observatory
DR. S. H. PLAGEMANN, Institute of Theoretical Astronomy, Cambridge
FRANCE
DR. A. BAGLIN, Paris
DR. C. CHEVALIER, Institut d'Astrophysique, Paris
DR. A. M. FRINGANT, Institut d'Astrophysique, Paris
DR. R. HERMAN, Observatoire de Paris, Meudon
DR. M. LACOARRET, Observatoire de Nice
DR. J. M. LE CONTEL, Paris
DR. M. C. LORTET-ZUCKERMANN, Institut d'Astrophysique, Paris
DR. C. OUNNAS, Observatoire de Nice
M. PETIT, Drancy
GERMAN
DEMOCRATIC REPUBLIC
DR. P. AHNERT, Sternwarte Sonneberg
DR. W. GÖTZ, Sternwarte Sonneberg
H. HUTH, Sternwarte Sonneberg
I. MEINUNGER, Sternwarte Sonneberg
DR. L. MEINUNGER, Sternwarte Sonneberg
DR. G. RICHTER, Sternwarte Sonneberg
DR. W. SCHÖNEICH, Astrophysikalisches Observatorium Potsdam
W. THÄNERT, Sternwarte Sonneberg
DR. W. WENZEL, Sternwarte Sonneberg
GERMAN
FEDERAL REPUBLIC
DR. E. H. GEYER, Observatorium Hoher List
DR. H. MAUDER, Remeis-Sternwarte Bamberg
DR. E. POHL, Sternwarte Nürnberg
E. SCHÖFFEL, Remeis-Sternwarte Bamberg
DR. W. SEGGEWISS, Observatorium Hoher List
DR. W. C. SEITTER, Universitäts-Sternwarte Bonn
Prof. DR. W. STROHMEIER, Remeis Sternwarte Bamberg
HUNGARY
DR. I. ALMÁR, Konkoly Observatory Budapest
DR. B. BALÁZS, Konkoly Observatory Budapest
DR. J. BALÁZS-DETRE, Konkoly Observatory Budapest
K. BARLAI, Konkoly Observatory Budapest
Prof. DR. L. DETRE, Konkoly Observatory Budapest
E. ILLÉS, Konkoly Observatory Budapest
S. KANYÓ, Konkoly Observatory Budapest
M. LOVAS, Konkoly Observatory Budapest
DR. B. SZEIDL, Konkoly Observatory Budapest
ITALY
DR. P. BROGLIA, Osservatorio Astronomico Merate
DR. C. BLANCO, Osservatorio Astrofisico Catania
DR. F. CATALANO, Osservatorio Astrofisico Catania
DR. S. CRISTALDI, Osservatorio Astrofisico Catania
Prof. DR. G. GODOLI, Osservatorio Astrofisico Catania
DR. A. MAMMANO, Osservatorio Astrofisico Asiago
DR. R. MARGONI, Osservatorio Astrofisico Asiago
Prof. DR. A. MASANI, Osservatorio Astrofisico di Brera
DR. M. RODONO, Osservatorio Astrofisico Catania
Prof. DR. L. ROSINO, Astrophysical Observatory Asiago
NETHERLANDS
DR. M. DE GROOT, University of Utrecht
POLAND
DR. P. FLIN, Astronomical Observatory Wroclaw
DR. T. JARZEBOWSKI, Astronomical Observatory Wroclaw
DR. J. M. KREINER, Astronomical Observatory Cracow
DR. W. KRZEMINSKI, Astronomical Observatory Warsaw
DR. J. SMAK, Astr. Obs. of Warsaw University
DR. K. STEPIEN, Astronomical Observatory Warsaw
DR. R. SZAFRANIEC, Astronomical Observatory Cracow
ROUMANIA
DR. Á. PÁL, Observatoire astronomique Cluj
DR. I. TODORAN, Observatoire Astronomique Cluj
SOUTH AFRICA
M. W. FEAST, Radcliffe Observatory
SWEDEN
DR. G. LARSSON-LEANDER, Astr. Institute, Lund
U. S. A.
DR. L. ANDERSON, University of California, Berkeley
R. W. AVERY, Flower and Cook Observatory
DR. W. S. FITCH, Steward Observatory
DR. G. H. HERBIG, Lick Observatory
DR. M. W. MAYALL, Cambridge
DR. E. F. MILONE, Gettysburg College
J. F. SIEVERS, Flower and Cook Observatory
Prof. DR. A. SLETTEBAK, Perkins Observatory
Prof. DR. F. B. WOOD, University of Florida, Gainesville
U. S. S. R.
DR. M. A. ARAKELIAN, Byurakan Astrophysical Observatory
DR. A. A. BOYARCHUK, Crimean Astrophysical Observatory
DR. E. A. DIBAJ, Sternberg State Astronomical Institute
DR. YU. S. EFIMOV, Crimean Astrophysical Observatory
DR. G. E. ERLEKSOVA, Astrophysical Institute Dushanbe
DR. R. E. GERSHBERG, Crimean Astrophysical Observatory
DR. I. D. KUPO, Alma Ata Observatory
DR. L. LUUD, Estonian Academy of Sciences, Tartu
DR. V. S. OSKANIAN, Byurakan Astrophysical Observatory
DR. E. S. PARSAMIAN, Byurakan Astrophysical Observatory
DR. U. V. PROKOFJEVA, Crimean Astrophysical Observatory
DR. I. B. PUSTYLNIK, Byurakan Astrophysical Observatory
DR. N. SHAKOVSKY, Crimean Astrophysical Observatory
DR. R. A. VARDANIAN, Byurakan Astrophysical Observatory
TABLE OF CONTENTS
Page
Preface III
List of Participants V
PART I
STATISTICAL AND PHYSICAL INTERPRETATION
OF IRREGULARITIES
MODERN TECHNIQUES OF OBSERVATION AND ANALYSIS
1. L. DETRE: Statistical and physical interpretation of non-periodic
phenomena in variable stars. Introductory report 3
2. S. P. PLAGEMANN: Spectral analysis of the light curves of T Tauri
stars and other objects 21
3. G. BARBARO, N. DALLAPORTA, C. SUMMA: On the presumed presupernova
stage for type II supernovae 41
4. S. CRISTALDI, L. PATERNO: Synchronous three colour stellar photometry
at the Catania Astrophysical Observatory 51
5. A. N. ABRAMENKO, V. V. PROKOFJEVA: About the T. V. photometry of
faint variable stars 57
PART II
INTRINSIC IRREGULAR VARIABLES
A. VERY YOUNG STARS
6. W. WENZEL: Extremely young stars. Introductory Report 61
7. G. H. HERBIG: The light variations of the nuclei in Herbig-Haro
object No. 2, 1946-1968 75
8. E. H. GEYER, W. SEGGEWISS: Photoelectric observations of 6 southern RW
Aurigae variables 85
9. L. ANDERSON, L. V. KUHI: Hydrogen emission phenomena in T Tauri stars 93
10. MERLE F. WALKER: The evidence for variable infall of material in
the ultraviolet excess stars 103
11. E. A. DIBAJ, V. F. ESIPOV: Emission H alpha-line profiles in several
T Tau stars 107
B. FLARE STARS
12. R. E. GERSHBERG: Flares of UV Ceti type stars. Introductory Report 111
13. P. F. CHUGAINOV: Cooperative 24-hour observations of UV Ceti-type
stars 127
14. V. S. OSKANIAN: The classification of photometric light-curves
of flares of UV Ceti stars 131
15. A. D. ANDREWS: Multi-colour photometry of Orion flare stars 137
16. S. CRISTALDI, G. GODOLI, M. NARBONE, M. RODONO: Photoelectric
research on flare stars at the Catania Astrophysical Observatory 149
17. G. A. BAKOS: HD 160202 - an early-type flare star 159
18. M. D. ARAKELIAN: On the group of young stars in the solar vicinity 161
19. L. V. MIRZOYAN, E. S. PARSAMIAN: Flare stars near NGC 7023 165
20. Yu. S. EFIMOV: On the polarimetric study of UV Ceti-type star flares 169
21. L. ROSINO: Preliminary results of a survey of nebular variables
and flare stars 173
C. Of, Be, SHELL STARS
22. A. SLETTEBAK: Of and Be stars. Introductory report 179
23. J. B. HUTCHINGS: Photoelectric observation of line profiles
with high time resolution in B and Be stars 191
24. L. LUUD: Some remarks on the spectral and light variability
of P Cygni 197
25. M. DE GROOT: Spectral variations of P Cygni 203
26. N. L. IVANOVA, I. D. KUPO, CH. MAMATKAZINA: Variations in
the continuous spectrum of gamma Cas 215
27. A. M. DEPLACE, R. HERMAN, A. PETON: Variations rapides,
probablement non périodiques d'enveloppes d'étoiles Be 223
D. IRREGULAR MAGNETIC VARIABLES
28. T. JARZEBOWSKI: The problem of irregular variations in magnetic star 227
29. K. STEPIEN: Photometric search for periodicity among magnetic stars 239
30. C. BLANCO, F. CATALANO, G. GODOLI: Photometric research
on magnetic stars at the Catania Astrophysical Observatory 243
E. R CrB VARIABLES
31. M. W. FEAST: RY Sgr during the 1967-8 minimum: a blue continuum and
other spectroscopic and photometric observations 253
F. NOVA OUTBURSTS
32. R. BARBON, A. MAMMANO, L. ROSINO: Spectroscopic observations
of the recurrent nova RS Ophiuchi from 1959 to 1968 257
33. G. CHINCARINI, L. ROSINO: Spectroscopic observations
of the recurrent nova T Pyxidis during the 1967 maximum 261
34. A. MAMMANO, R. MARGONI, L. ROSINO: Preliminary report
on the spectrum of Nova Vul 1968 271
35. W. C. SEITTER: On Nova Delphini 1967 and some slow nova
characteristics 277
PART III
IRREGULAR ACTIVITY IN PERIODIC VARIABLES
A. beta CMa, delta Sct VARIABLES
36. W. S. FITCH: Tidal resonances in some pulsation modes of
the Beta Canis Majoris star 16 Lacertae 287
37. J.-M. LE CONTEL: Variations dans le spectre de gamma Pegasi 297
VARIATIONS IN delta SCUTI STARS
38. a) A. BAGLIN, F. PRADERIE, M. N. PERRIN: Is gamma Bootis
a spectrum variable star? 303
39. b) C. CHEVALIER: The short-period variability of 14 Aur (HR 1706) 306
B. RR LYRAE, delta CEPHEI STARS
40. C. COUTTS: On the nature of some of the O-C diagrams of the RR Lyrae
variables in M5 313
41. Q. P. VASILJANOVSKAJA, G. E. ERLEKSOVA: Instability of light curves
and periods of longperiod Cepheids belonging to the spherical
component of the Galaxy 321
C. LATE TYPE GIANTS
42. P. AHNERT: Correlations between the irregularities of the period
and the radial velocity, length of period, amplitude and spectrum
of Mira-variables 325
43. P. L. FISCHER: The irregularities in the light-changes of Mira Ceti 331
44. R. A. VARDANIAN: On the intrinsic light-polarization
of some late type stars 339
PART IV
NON-PERIODIC PHENOMENA IN BINARY SYSTEMS
A. HOT, VERY SHORT-PERIOD ERUPTIVE
BINARIES: OLD NOVAE, U GEM STARS etc.
45. J. SMAK: Introductory report 345
46. J. SMAK, K. STEPIEN: Photometric observations of the peculiar
blue variable TT Ari = BD +14 341 355
47. S. M. RUCINSKI: Photometric effects for highly distorted white
dwarf secondaries in close binary systems 361
48. W. KRZEMINSKI, J. SMAK: Photometric observations of nova WZ Sagittae
and their interpretation 371
49. M. W. MAYALL: Eclipses of U Geminorum 377
50. MARIE-CLAIRE LORTET: The standstills of light of Z Cam stars.
Photoelectric and spectrographic observations 381
51. M. PETIT: Analyse des courbes de lumiére des étoiles du
type U Geminorum 383
52. V. G. GORBATZKY: On a possible cause of brightness fluctuations
in close binary systems of dwarf stars 391
B. SYMBIOTIC STARS
53. A. A. BOYARCHUK: Symbiotic stars. Introductory Report 395
54. A. MAMMANO, L. ROSINO: Spectral evolution of the peculiar
star MHalpha 328-116 (V 1016 Cyg) from 1965 to 1967 411
55. A. MAMMANO, A. MARTINI: Spectroscopic variations in WY Gem, W Cep and
HD 4174 415
C. CONTACT BINARIES AND W UMa STARS
56. H. MAUDER: Theoretical light changes of W UMa Stars with low
mass ratio 419
57. I. B. PUSTYLNIK: On the reflection effect in close binaries 423
58. V. I. BURNASHOV, E. A. VITRICHENKO: Nearly contact binary HD 17514 427
D. CONVENTIONAL BINARIES
59. F. B. WOOD: Introductory Report 429
60. S. CATALANO, M. RODONO: Photometric research on RS CVn at the Catania
Astrophysical Observatory 435
61. G. LARSSON-LEANDER: Changes in the light curve
of Beta Lyrae 1958-1959 443
62. E. F. MILONE: The O'Connell-effect in some eclipsing variables 457
63. T. HERCZEG: Sudden changes in the period of Algol 465
64. E. POHL: On the research program concerning eclipsing variables
at the observatories Nürnberg and Izmir 471
PART V
MISCELLANEOUS PROBLEMS
65. H. SAWYER-HOGG: The third catalogue of variable stars
in globular clusters 475
66. N. S. NIKOLOV, P. Z. KUNCHEV: The Cepheids on the colour-colour plot 481
67. M. V. PENSTON, R. D. CANNON: Irregular variations of radio sources 485
PART I
STATISTICAL AND PHYSICAL INTERPRETATION OF
IRREGULARITIES
MODERN TECHNIQUES OF OBSERVATION OR ANALYSIS
STATISTICAL AND PHYSICAL INTERPRETATION
OF NON-PERIODIC PHENOMENA IN VARIABLE STARS
L. DETRE
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SPECTRAL ANALYSIS OF THE LIGHT CURVES
OF T TAURI STARS AND OTHER OBJECTS
STEPHEN PLAGEMANN
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ON THE PRESUMED PRESUPERNOVA STAGE FOR TYPE II SUPERNOVAE
G. BARBARO, N. DALLAPORTA, C. SUMMA
[HTML]
SYNCHRONOUS THREE COLOUR STELLAR PHOTOMETRY
AT THE CATANIA ASTROPHYSICAL OBSERVATORY
S. CRISTALDI and L. PATERNO
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ABOUT THE T. V. PHOTOMETRY OF FAINT VARIABLE STARS
A. N. ABRAMENKO and V. V. PROKOFJEVA
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PART II
INTRINSIC IRREGULAR VARIABLES
A. VERY YOUNG STARS
B. FLARE STARS
C. Of, Be AND SHELL STARS
D. IRREGULAR MAGNETIC VARIABLES
E. R CrB VARIABLES
F. NOVA OUTBURSTS
A. VERY YOUNG STARS
EXTREMELY YOUNG STARS
W. WENZEL
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THE LIGHT VARIATIONS OF THE NUCLEI IN HERBIG-HARO
OBJECT NO. 2, 1946-1968
G. H. HERBIG
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PHOTOELECTRIC OBSERVATIONS OF 6 SOUTHERN RW AURIGAE
VARIABLES
W. SEGGEWISS and E. H. GEYER
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HYDROGEN EMISSION PHENOMENA IN T TAURI STARS
L. ANDERSON and L. V. KUHI
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THE EVIDENCE FOR VARIABLE INFALL OF MATERIAL IN THE
ULTRAVIOLET EXCESS STARS
MERLE F. WALKER
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EMISSION H alpha-LINE PROFILES IN SEVERAL T TAU STARS
E. A. DIBAJ and V. F. ESIPOV
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B. FLARE STARS
FLARES OF UV CETI TYPE STARS. INTRODUCTORY REPORT
R. E. GERSHBERG
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COOPERATIVE 24-HOUR OBSERVATIONS OF UV CETI-TYPE STARS
P. F. CHUGAINOV
[HTML]
THE CLASSIFICATION OF PHOTOMETRIC LIGHT-CURVES OF FLARES OF UV CETI STARS
V. S. OSKANIAN
[HTML]
MULTI-COLOUR PHOTOMETRY OF ORION FLARE STARS
A. D. ANDREWS
[HTML]
PHOTOELECTRIC RESEARCH ON FLARE STARS AT THE CATANIA
ASTROPHYSICAL OBSERVATORY
S. CRISTALDI, G. GODOLI, M. NARBONE and M. RODONO
[HTML]
HD 160202 - AN EARLY-TYPE FLARE STAR
GUSTAV A. BAKOS
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ON THE GROUP OF YOUNG STARS IN THE SOLAR VICINITY
M. A. ARAKELIAN
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FLARE STARS NEAR NGC 7023
L. V. MIRZOYAN and E. S. PARSAMIAN
[HTML]
ON THE POLARIMETRIC STUDY OF UV CETI TYPE STAR FLARES
Yu. S. EFIMOV
[HTML]
PRELIMINARY RESULTS OF A SURVEY OF NEBULAR VARIABLES
AND FLARE STARS
L. ROSINO
[HTML]
C. Of, Be, shell stars
Of AND Be STARS
Introductory Report by
ARNE SLETTEBAK
[HTML]
PHOTOELECTRIC OBSERVATION OF LINE PROFILES WITH HIGH
TIME RESOLUTION IN B AND Be STARS
J. B. HUTCHINGS
[HTML]
SOME REMARKS ON THE SPECTRAL AND LIGHT VARIABILITY
OF P CYGNI
L. LUUD
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SPECTRAL VARIATIONS OF P CYGNI
MART DE GROOT
[HTML]
VARIATIONS IN THE CONTINUOUS SPECTRUM OF GAMMA CAS
N. L. IVANOVA, I. D. KUPO and A. CH. MAMATKAZINA
[HTML]
VARIATIONS RAPIDE, PROBABLEMENT NON PERIODIQUES
D'ENVELOPPES D'ETOILES Be
A. M. DEPLACE, R. HERMAN, A. PETON
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D. Irregular magnetic variables
THE PROBLEM OF IRREGULAR VARIATIONS IN MAGNETIC STARS
Introductory Report by
T. JARZEBOWSKI
[HTML]
PHOTOMETRIC SEARCH FOR PERIODICITY AMONG MAGNETIC
STARS
KAZIMIERZ STEPIEN
[HTML]
PHOTOMETRIC RESEARCH ON MAGNETIC STARS AT THE CATANIA
ASTROPHYSICAL OBSERVATORY
C. BLANCO, F. CATALANO, and G. GODOLI
[HTML]
RY SGR DURING THE 1967-8 MINIMUM: A BLUE CONTINUUM AND
OTHER SPECTROSCOPIC AND PHOTOMETRIC OBSERVATIONS*
M. W. FEAST
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SPECTROSCOPIC OBSERVATIONS OF THE RECURRENT NOVA
RS OPHIUCHI FROM 1959 TO 1968
R. BARBON, A. MAMMANO, L. ROSINO
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SPECTROSCOPIC OBSERVATIONS OF THE RECURRENT NOVA
T PYXIDIS DURING THE 1967 MAXIMUM
G. CHINCARINI, L. ROSINO
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PRELIMINARY REPORT ON THE SPECTRUM OF NOVA VUL 1968
A. MAMMANO, R. MARGONI and L. ROSINO
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ON NOVA DELPHINI 1967 AND SOME SLOW NOVA
CHARACTERISTICS
WALTRAUT CAROLA SEITTER
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PART III
IRREGULAR ACTIVITY IN PERIODIC VARIABLES
A. beta CMa, delta Sct VARIABLES
B. RR Lyr, delta Cep VARIABLES
C. LATE-TYPE GIANTS
A. beta CMa, delta Sct VARIABLES
TIDAL RESONANCES IN SOME PULSATION MODES OF THE BETA
CANIS MAJORIS STAR 16 LACERTAE
W. S. FITCH
[HTML]
VARIATIONS DANS LE SPECTRE DE GAMMA PEGASI
JEAN-MICHEL LE CONTEL
[HTML]
VARIATIONS IN delta SCUTI STARS
IS gamma BOOTIS A SPECTRUM VARIABLE STAR?
A. BAGLIN
[HTML]
THE SHORT-PERIOD VARIABILITY OF 14 AUR (HR 1706)
C. CHEVALIER
[HTML]
B. RR Lyr, delta Cep VARIABLES
ON THE NATURE OF SOME OF THE O-C DIAGRAMS OF THE
RR LYRAE VARIABLES IN M5
C. COUTTS
[HTML]
INSTABILITY OF LIGHT CURVES AND PERIODS OF LONGPERIOD
CEPHEIDS BELONGING TO THE SPHERICAL COMPONENT OF THE
GALAXY
O. P. VASILJANOVSKAJA and G. E. ERLEKSOVA
[HTML]
C. LATE-TYPE GIANTS
CORRELATIONS BETWEEN THE IRREGULARITIES OF THE PERIOD
AND RADIAL VELOCITY, LENGTH OF PERIOD, AMPLITUDE
AND SPECTRUM OF MIRA-VARIABLES
P. AHNERT
[HTML]
THE IRREGULARITIES IN THE LIGHT-CHANGES OF MIRA CETI
P. L. FISCHER
[HTML]
ON THE INTRINSIC LIGHT-POLARIZATION IN SOME LATE TYPE
STARS
R. A. VARDANIAN
[HTML]
PART IV
NON-PERIODIC PHENOMENA IN BINARY SYSTEMS
A. HOT, VERY SHORT-PERIOD ERUPTIVE BINARIES: OLD NOVAE, U Gem STARS etc.
B. SYMBIOTIC STARS
C. CONTACT BINARIES AND W UMa STARS
D. CONVENTIONAL BINARIES: PERIOD VARIATIONS, INTERPRETATION IN TERMS OF GAS
STREAMS, MASS EXCHANGE etc.
A. HOT, VERY SHORT-PERIOD ERUPTIVE BINARIES
INTRODUCTORY REPORT
J. SMAK
[HTML]
PHOTOMETRIC OBSERVATIONS
OF THE PECULIAR BLUE VARIABLE TT ARI = BD +14 341
J. SMAK and K. STEPIEN
[HTML]
PHOTOMETRIC EFFECTS FOR HIGHLY DISTORTED WHITE DWARF
SECONDARIES IN CLOSE BINARY SYSTEMS
S. M. RUCINSKI
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PHOTOMETRIC OBSERVATIONS OF NOVA WZ SAGITTAE AND
THEIR INTERPRETATION
W. KRZEMINSKI and J. SMAK
[HTML]
ECLIPSES OF U GEMINORUM
MARGARET W. MAYALL
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THE STANDSTILLS OF LIGHT OF Z CAM STARS
PHOTOELECTRIC AND SPECTROGRAPHIC OBSERVATIONS
MARIE-CLAIRE LORTET
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ANALYSE DES COURBES DE LUMIERE DES ETOILES DU TYPE
U GEMINORUM
MICHEL PETIT
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ON A POSSIBLE CAUSE OF BRIGHTNESS FLUCTUATIONS IN
CLOSE BINARY SYSTEMS OF DWARF STARS
V. G. GORBATZKY
[HTML]
B. SYMBIOTIC STARS
INTRODUCTORY REPORT
A. A. BOYARCHUK
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SPECTRAL EVOLUTION OF THE PECULIAR STAR MHalpha 328-116
(V 1016 CYG) FROM 1965 TO 1967
A. MAMMANO, L. ROSINO
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SPECTROSCOPIC VARIATIONS IN WY GEM, W CEP AND HD 4174
A. MAMMANO, A. MARTINI
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C. CONTACT BINARIES AND W UMa STARS
THEORETICAL LIGHT CHANGES OF W UMa STARS WITH LOW
MASS RATIO
H. MAUDER
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ON THE REFLECTION EFFECT IN CLOSE BINARIES
I. B. PUSTYLNIK
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NEARLY CONTACT BINARY HD 17514
V. I. BURNASHOV and E. A. VITRICHENKO
[HTML]
D. CONVENTIONAL BINARIES
INTRODUCTORY REPORT
FRANK BRADSHAW WOOD
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PHOTOMETRIC RESEARCH ON RS CVn AT THE CATANIA
ASTROPHYSICAL OBSERVATORY
S. CATALANO and M. RODONO
[HTML]
CHANGES IN THE LIGHT CURVE OF BETA LYRAE 1958-1959
G. LARSSON-LEANDER
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THE O'CONNELL EFFECT IN SOME ECLIPSING VARIABLES
E. F. MILONE
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SUDDEN CHANGES IN THE PERIOD OF ALGOL
T. HERCZEG
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ON THE RESEARCH PROGRAM CONCERNING ECLIPSING
VARIABLES AT THE OBSERVATORIES NURNBERG AND IZMIR
E. POHL
[HTML]
THE THIRD CATALOGUE OF VARIABLE STARS IN GLOBULAR
CLUSTERS
HELEN SAWYER HOGG
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THE CEPHEIDS ON THE COLOUR-COLOUR PLOT
N. S. NIKOLOV and P. Z. KUNCHEV
[HTML]
IRREGULAR VARIATIONS OF RADIO SOURCES
M. V. PENSTON and R. D. CANNON
[HTML]