Non-Periodic Phenomena in Variable Stars

Front Matter....Pages I-XII
Front Matter....Pages 1-1
Statistical and Physical Interpretation of Non-Periodic Phenomena in Variable Stars....Pages 3-19
Spectral Analysis of the Light Curves of T Tauri Stars and Other Objects....Pages 21-39
On the Presumed Pre Supernova Stage for Type II Super-Novae....Pages 41-49
Synchronous Three Colour Stellar Photometry at the Catania Astrophysical Observatory....Pages 51-56
About the T. V. Photometry of Faint Variable Stars....Pages 57-58
Front Matter....Pages 59-59
Extremely Young Stars....Pages 61-73
The Light Variations of the Nuclei in Herbig-Haro Object No. 2, 1946–1968....Pages 75-83
Photoelectric Observations of 6 Southern RW Aurigae Variables....Pages 85-92
Hydrogen Emission Phenomena in T Tauri Stars....Pages 93-101
The Evidence for Variable Infall of Material in the Ultraviolet Excess Stars....Pages 103-105
Emission Hα-Line Profiles in Several T Tau Stars....Pages 107-109
Flares of UV Ceti Type Stars....Pages 111-126
Cooperative 24-Hour Observations of UV Ceti-Type Stars....Pages 127-130
The Classification of Photometric Light-Curves of Flares of UV Ceti Stars....Pages 131-136
Multi-Colour Photometry of Orion Flare Stars....Pages 137-148
Photoelectric Research on Flare Stars at the Catania Astrophysical Observatory....Pages 149-157
HD 160202 — An Early-Type Flare Star....Pages 159-160
On the Group of Young Stars in the Solar Vicinity....Pages 161-163
Flare Stars Near NGC 7023....Pages 165-167
On the Polarimetric Study of UV Ceti Type Star Flares....Pages 169-171
Front Matter....Pages 59-59
The Problem of Irregular Variations in Magnetic Stars....Pages 227-237
Photometric Search for Periodicity Among Magnetic Stars....Pages 239-241
Photometric Research on Magnetic Stars at the Catania Astrophysical Observatory....Pages 243-251
RY SGR during the 1967–8 Minimum: A Blue Continuum and Other Spectroscopic and Photometric Observations....Pages 253-256
Spectroscopic Observations of the Recurrent Nova RS Ophiuchi from 1959 to 1968....Pages 257-260
Spectroscopic Observations of the Recurrent Nova T Pyxidis during the 1967 Maximum....Pages 261-269
Preliminary Report on the Spectrum of Nova Vul 1968....Pages 271-276
On Nova Delphini 1967 and Some Slow Nova Characteristics....Pages 277-284
Preliminary Results of a Survey of Nebular Variables and Flare Stars....Pages 173-177
Of and be Stars....Pages 179-189
Photoelectric Observation of Line Profiles with High Time Resolution in B and Be Stars....Pages 191-196
Some Remarks on the Spectral and Light Variability of P Cygni....Pages 197-201
Spectral Variations of P Cygni....Pages 203-213
Variations in the Continuous Spectrum of γ Cas....Pages 215-221
Variations Rapide, Probablement Non Périodiques d’Enveloppes d’Étoiles Be....Pages 223-226
Front Matter....Pages 285-285
Tidal Resonances in Some Pulsation Modes of the Beta Canis Majoris Star 16 Lacertae....Pages 287-296
Variations Dans Le Spectre De γ Pegasi....Pages 297-301
Is γ Bootis a Spectrum Variable Star?....Pages 303-306
The Short-Period Variability of 14 Aur (HR 1706)....Pages 306-311
On The Nature of Some of the O-C Diagrams of the Rr Lyrae Variables in M5....Pages 313-320
Front Matter....Pages 285-285
Instability of Light Curves and Periods of Longperiod Cepheids Belonging to the Spherical Component of the Galaxy....Pages 321-324
Correlations Between the Irregularities of the Period and Radial Velocity, Length of Period, Amplitude and Spectrum of Mira-Variables....Pages 325-329
The Irregularities in the Light-Changes of Mira Ceti....Pages 331-338
On the Intrinsic Light-Polarization in-Some Late Type Stars....Pages 339-341
Front Matter....Pages 343-343
Introductory Report....Pages 345-354
Photometric Observations of the Peculiar Blue Variable TT ARI = BD + 14°341....Pages 355-359
Photometric Effects for Highly Distorted White Dwarf Secondaries in Close Binary Systems....Pages 361-369
Photometric Observations of Nova WZ Sagittae and their Interpretation....Pages 371-376
Eclipses of U Geminorum....Pages 377-380
The Standstills of Light of Z Cam Stars Photoelectric and Spectrographic Observations....Pages 381-382
Analyse des Courbes de Lumière des Étoiles du Type U Geminorum....Pages 383-390
On a Possible Cause of Brightness Fluctuations in Close Binary Systems of Dwarf Stars....Pages 391-393
Symbiotic Stars....Pages 395-410
Spectral Evolution of the Peculiar Star Mhα 328-116 (V 1016 CYG) from 1965 to 1967....Pages 411-413
Spectroscopic Variations in WY Gem, W Cep and HD 4174....Pages 415-418
Theoretical Light Changes of W Uma Stars with Low Mass Ratio....Pages 419-422
On the Reflection Effect in Close Binaries....Pages 423-426
Nearly Contact Binary HD 17514....Pages 427-427
Non- Periodic Phenomena in Binary Systems. Conventional Binaries....Pages 429-433
Photometric Research on RS CVn at the Catania Astrophysical Observatory....Pages 435-441
Front Matter....Pages 343-343
Changes in the Light Curve of Beta Lyrae 1958–1959....Pages 443-455
The O’Connell Effect in Some Eclipsing Variables....Pages 457-464
Sudden Changes in the Period of Algol....Pages 465-470
On the Research Program Concerning Eclipsing Variables at the Observatories Nürnberg and Izmir....Pages 471-472
Front Matter....Pages 473-473
The Third Catalogue of Variable Stars in Globular Clusters....Pages 475-479
The Cepheids on the Colour-Colour Plot....Pages 481-484
Irregular Variations of Radio Sources....Pages 485-490