Active Close Binaries

Since the 1970s symposia or colloquia devoted to recent research on close binaries have been held around the world almost annually. At meetings of the General Assembly of the International Astronomical Union this topic has also been discussed in detail at presentations in various commission meetings and also as invited talks by leading astronomers in the field. In recent years, fundamental changes have taken place in the study of close binaries due to the improvements in observational techniques, extension of observations from X-ray to radio regions of the electromagnetic spectrum, and advances in theoretical studies. For more than a decade, a group of astronomers at Ege University Observatory has been concentrating on active close binaries with particular emphasis on the behaviour of the light curves of chromospherically active systems. Thus, we decided to organize an international meeting in Western Anatolia, where this part of Turkey had been the cradle for great developments in science during antiquity. KUljadasi, located only minutes away from Ephesus, one of the seven wonders of the world, was selected to be the meeting site. Close binary systems constitute a very rich source of information about the physical properties of the component stars. Some systems are eclipsing variables, where periodic recurrences of eclipses are observed as comparatively brief decreases in the total brightness of the binary system. Precise methods of photometric observations make it possible to obtain the light variations of these systems because of eclipses and other phenomena. Front Matter....Pages i-xvi Openingg Remarks On Physical Causes of the Light Variations of Active Binary Systems and on their Interpretation....Pages 1-6 Eclipsing Binaries as Astrophysical Laboratories and the Strange Case of Epsilon Aurigae....Pages 7-36 Accretion Disks in Non-Degenerate Binaries....Pages 37-48 Resolving the Puzzle of the W Serpentis Stars....Pages 49-60 Extragalactic Interacting Binaries....Pages 61-68 Effective Gravity-Darkening of Close Binary Systems....Pages 69-79 Binary Activity at the Top of the Main Sequence: Y Cyg and U Oph....Pages 81-94 Period Changes and Magnetic Cycles....Pages 95-119 Absolute Dimensions of Classical Algol-Type Binaries....Pages 121-135 Recent Results of Apsidal Motion Studies in Eclipsing Binaries....Pages 137-143 On the Orbital Circularization of Close Binaries....Pages 145-154 Stellar Structure and Evolution with Respect to Binarity....Pages 155-160 An Optimization Method for solutions of Close Eclipsing Binaries....Pages 161-188 Spectrophotometry of Algol-Type Binaries....Pages 189-201 Complications in the Balmer-Line Spectrum of TT Hydrae....Pages 203-211 An Optimization Technique for the Fourier Analysis of the Light Curves of Totally Eclipsing Systems of Algol-Type....Pages 213-218 The Algol-Type Binary U Coronae Borealis, a Triple?....Pages 219-235 Interacting Binary CX Draconis....Pages 237-238 Disk-Driven Precession in Active Close Binaries and in Active Galactic Nuclei....Pages 239-240 Near-Contact Binary Stars....Pages 241-251 Observations and Light Curve Analysis of Eclipsing Binaries of W UMa — Type....Pages 253-266 A Radial-Velocity Search for Brown Dwarfs and the Low-Mass Companion of HD114762....Pages 267-276 Photometry of Some Close Binaries at the Ankara University Observatory....Pages 277-285 Circularization, Synchronization, and Differential Rotation in Chromospherically Active Binaries....Pages 287-307 Do Thermally Decoupled Late-Type Contact Binaries Really Exist?....Pages 309-319 The Evolution of the Period and Synchronization for Close G-Type MS Binaries....Pages 321-329 The A-Type W Uma System Aw Uma....Pages 331-346 Rotation and Activity....Pages 347-362 Solar-Like Magnetic Structures in Active Close Binaries....Pages 363-375 Starspot Lifetimes....Pages 377-392 Tidal Torques and Magnetic Stellar Winds in RS CVn Binaries....Pages 393-409 Flares on RS CVn and Related Binaries....Pages 411-429 Activity and Evolution in RS CVn Systems....Pages 431-465 Deciphering Long-Term Photospheric and Chromospheric Activity on the Contact Binary VW Cephei....Pages 467-484 Synoptic Doppler Imaging and Photometry of Spotted Chromospherically Active Stars....Pages 485-491 Infrared Studies on Active Binaries and Circumstellar Matter....Pages 493-499 Infrared photometry of RS CVn short-period systems....Pages 501-508 On Chromospheric Emission and Photometric Variability of Active Late-Type Stars....Pages 509-514 Long-Term Observations of Active Binaries....Pages 515-544 Similarities and Differences Between the Light Variability of the K Giant and Dwarf Active Binaries HK Lac and BY Dra....Pages 545-549 Recent Measures of CaII H and K Chromospheric Fluxes in a Sample of RS CVn Systems....Pages 551-560 Photometric Variability of II Pegasi....Pages 561-572 Activity cycle in the RS CVn system II Peg....Pages 573-578 Low Flux Line Profiles on the IUE Spectra of II Peg....Pages 579-589 A Photometric Study of UV Piscium....Pages 591-600 Novae and Their Non Spherically Symmetric Explosions....Pages 601-610 Optical Properties of Cataclysmic Variable Stars....Pages 611-627 IUE Spectra of Cataclysmic Variables: Observational Results and Theoretical Implications....Pages 629-638 Binaries and Pulsars as gravitational Wave Sources: Possibility of Direct Detection By Ground Based Experiments....Pages 639-691 Neutron Star Masses....Pages 693-727 High Angular Resolution Studies of Binaries at Georgia State University....Pages 729-736 Extreme Ultraviolet Spectroscopy as a Probe of Active Close Binaries....Pages 737-746 Modelling the Coronae and Chromospheres of RS CVn Systems by the Analysis of Ultraviolet, X-Ray and Radio Observations....Pages 747-759 Magnetic Flares in Close Binaries....Pages 761-803 The Evolution of Chromospheric Structure on AR Lacertae....Pages 805-808 Spatial Resolution of Stellar Atmospheres within Active Close Binaries....Pages 809-819 Information Limit Optimization Techniques applied to AB Doradus....Pages 821-830 The Complementarity of Doppler Imaging and Starspot Modelling....Pages 831-843 Perspectives for Ground-Based and Space Research on Active Close Binaries....Pages 845-857 Unified Treatment of Satellite Motion in Various Potential Fields....Pages 859-863 Light Curve Variations of the RS CVn-Type Eclipsing Binary ER Vulpeculae....Pages 865-871 Synthesis Methods for Eclipsing-Binary Light Curves....Pages 873-879 Types of Contact Binary Systems and Ways to Find Them....Pages 881-890 A Photometric Analyses of Eclipsing Systems in NGC188....Pages 891-896 Back Matter....Pages 897-913