The Symbiotic Phenomenon: Proceedings of the 103rd Colloquium of the International Astronomical Union, Held in Torun, Poland, August 18-20, 1987

ISBN-13: 9789401078337 / Angielski / Miękka / 2011 / 380 str.

Joanna Mikolajewska; M. Friedjung; Scott J. Kenyon

Opis

Symbiotic stars were identified spectroscopically as M giants with a very strong He II 4686 emission line. After five decades of study by many astronomers, the first internatioinal meetings devoted to symbiotics were held at the University of Colorado (Boulder) and at the Haute Provence Observatory during the Summer of 1981. These conferences emphasized exciting new results obtained by modern satellite (EINSTEIN, IUE) and ground-based observatories. Although the vast majority of the participants were already fairly sure that symbiotics are almost certainly interacting binary systems, and not extremely peculiar single stars, it was not clear exactly which types of physical processes were needed to be invoked to explain their observed behaviour. Many were even worried that it might not be possible to clearly define a class of "symbiotic stars" , and thus establish a unique model applicable to any system. Since the publication of the Haute-Provence proceedings, our understanding of the physical processes occuring in symbiotic stars (and in related objects such as cataclysmic variables and compact planetary nebulae) has greatly improved. We now speak confidently of a "symbiotic phenomenon" , in which an evolved red giant and a hot companion object (usually thought to be an accreting main sequence star or a luminous white dwarf star) happily coexist.

Spis treści

Session 1. The Basic Data.- A Perspective on the Symbiotic Stars.- Multifrequency Observations of Symbiotic Stars.- V 641 Cas — A Symbiotic Candidate?.- Ultraviolet FeII Absorption Lines in HD 59643.- Orbital Radial Velocity Curves of Symbiotic Stars.- Orbital Parameters of Three Symbiotic Stars.- Properties of Cool Stellar Components in S-Type Symbiotic Stars.- Absolute Energy Distributions for Selected Quiescent Symbiotic Stars.- Infrared Observations of Symbiotic Miras.- The Environments of Cool Stars.- Dust Emission from Symbiotic Stars: Interpretation of IRAS Observations.- Atmospheric Shocks in Mira Variables — MgII Emission.- The Radio Properties of Symbiotic Stars.- Radio Imaging of Symbiotic Stars.- Observations of Bipolar Mass Flow from Symbiotic Stars.- Optical Polarimetry of Symbiotic Stars.- Polarimetry of Symbiotic Stars.- The Present State of Symbiotic Polarimetry.- Session 2. The Physics of the Symbiotic Phenomenon.- Ionization Models of Symbiotic Stars.- Photoionization Models with Accretion Disks.- Emission Line Ratio Classification of Symbiotic Stars.- Resonance Line Profiles from Radial Accretion Flows.- Colliding Winds in Symbiotic Systems.- Accretion Disks in Symbiotic Stars.- Accretion from Stellar Winds.- Thermonuclear Runaway Models for Symbiotic Novae.- On the Outburst of Symbiotic Stars.- Thermonuclear Runaways on Accreting Hot White Dwarfs.- The Decay Time after a Thermonuclear Flash.- General Discussion on the Physics of Symbiotic Stars.- Session 3. Physics of Individual Objects.- Z Andromedae: Quiescence and Activity.- CI Cygni — The Well Understood Symbiotic Binary?.- A P Cygni Profile for the He 10830 A Line of CI Cyg in Eclipse.- Symbiotic Eclipsing Binary Star CI Cyg. The Cold Component Variability.- AG Dra a Symbiotic Star with an Uncommon Cool Component.- Spectral Variations of AG Dra between 1981 and 1985.- CH Cyg: Ten Years of Activity.- CH Cygni Half a Century Ago — Changing Activity of the Cool Component.- Spectroscopic Orbit of the Eclipsing Symbiotic Star CH Cyg.- Slow and Rapid Changes of the Radial Velocities in the Symbiotic Binary CH Cygni.- Radial Velocities of CH Cyg Just as the Jets Appeared.- The Spectrum of CH Cygni — A Search for Rapid Line Variations.- Polarization in CH Cygni during Quiet and Active Phases.- Continued Radio Activity from CH Cygni.- An “Accretor-Propeller” Model of CH Cygni.- A Review of the R Aquarii System.- The Ultraviolet Spectrum of RX Puppis.- A Model for RX Puppis.- Symbiotic Star AG Pegasi — Retrospect and Prospects.- The Observations of AG Peg during 1985-1987.- The Photometric Period of AG Pegasi.- The Causes of the Light Variations in AG Peg.- Ultraviolet Variability of the Symbiotic Star AG Peg.- A New Absorption-Line Orbit for the Symbiotic Nova AG Pegasi.- The Symbiotic Novae.- The Symbiotic Nova PU Vul (Kuwano-Honda Object): Some Results of Coordinated Investigations.- The Spectroscopic Variations of the Symbiotic Nova PU Vul.- Emission Line Analyses of HBV 475, V1016 Cyg and HM Sge.- Session 4. Contributions for Other Individual Objects.- Photometric and Spectroscopic Variations of the Symbiotic Star EG Andromedae.- The Search for the Elusive Companion of EG Andromedae.- The Symbiotic Star UV Aurigae.- The Third Galactic Carbon Symbiotic.- BI Crucis.- Effects of Eccentric Orbit of BF Cygni on IUE and Optical Spectra.- Ultraviolet to Near Infrared Observations of BF Cyg.- Ultraviolet Variability of AX Persei.- IUE and Optical Observations of He 2-104.- Summary of Discussion on Individual Objects.- Session 5. Symbiotic Phenomena and Stellar Evolution Conclusions.- The Formation and Evolution of Symbiotic Stars.- Recurrent Novae.- Unravelling the Multiple Component Radio Emission of RS Oph in Outburst.- The 1987 Outburst of the Recurrent Nova U Sco.- What Can We Learn from ? Aur Binary Systems?.- Summary of Final Discussion.- Concluding Remarks.- Overheard in Torun.- Object Index.