This book is the proceedings of an international conference entitled "Close Binaries in the 21st Century: New Opportunities and Challenges", held in Syros island, Greece, June 27-30, 2005. The papers collected in this volume detail the latest achievements in the field and reflect the state of the art of the dynamically evolving area of binary star research.

InhaltsangabeClose Binaries in the 21 st Century: New Opportunities and Challenges.- The Brave New World of Binary Star Studies.- Multisite, Multiwavelength Studies of the Active Cool Binary CC Eri.- Late-type X-ray Emitting Binaries in the Solar Neighborhood and in Star Forming Regions.- Analysis of Extra-Solar Planetary Transits Using Tools from Eclipsing Binaries.- Photometric Studies of Twelve Deep, Low-mass Ratio Overcontact Binary Systems.- Updated UBV Light-Curve and Period Analysis of Eclipsing Binary HS Herculis.- The Period Variation of V839 Oph.- Investigation of Times of Minima of Selected Early-Type Eclipsing Binaries.- Photometric Studies of Bright Southern Binary Systems: ? Cra and ? Ori.- Photometric Solution of the O-type Eclipsing Binary V1007 Sco.- First results of the Central-East-South European Binary Star Study Group (CESEB).- Spot Modelling of ? Andromedae.- Chromospheric Activity and Orbital Solution of Six New Late-type Spectroscopic Binary Systems.- The Near-Contact System V387 Cygni: BVRI Photometry and Modelling.- Monitoring Secular Orbital Period Variations of Some Eclipsing Binaries at the Ankara University Observatory.- The W UMa-type Stars Program: First Results, Current Status and Perspectives.- A Mechanism for Producing Short-Period Binaries.- Evolutionary Status of Late-type Contact Binaries: Case of a 1.2 + 1 M ? Binary.- Wind Ionization Structure of the Short-Period Eclipsing LMC Wolf-Rayet Binary BAT99-129: Preliminary Results.- Masses and Radii of Low-Mass Stars: Theory Versus Observations.- Light-Time Effect in the Eclipsing Binaries GO Cyg, GW Cep, AR Aur and V505 Sgr.- X-ray Observations of Binary and Single Wolf-Rayet Stars with XMM-Newton and Chandra.- Libration Points in Schwarzschild's Circular Restricted Three-Body Problem.- Symbiotic Stars in the Context of Binary Evolution and Metallicity.- Properties of Components in Contact Systems.- On (? ? ?) and ( ? ?)-Type Relations for Close Binaries.- Radiation Pressure and Surface Gravity of Close Binaries: First Results from Observational Data Analysis.- The Spatial Distribution of W UMa-Type Stars.- Modeling the 2004.5 Brightening of the Contact Binary V839 Oph.- First Photometric Observations and Preliminary Results of Binaries FO Aurigae and V1025 Herculis.- Monitoring Possible Light-Time Effect in the Orbital Period of Some Eclipsing Binaries at the Ankara University Observatory.- Distributions of Geometrical and Physical Parameters of Contact Binaries.- Some Thoughts on Pulsation and Binarity.- Active Longitudes in Close Binaries.- Enhanced Activity in Close T Tauri Binaries.- Modelling Eclipsing Binaries with Dense Spot Coverage.- Orbital Period Changes and Long Term Luminosity Variation in Active Binary CG Cyg.- Short Time-Scale Variability in the Light Curve of TW Draconis.- X-ray Emission from the Pre-Main Sequence Systems FU Orionis and T Tauri.- A Search for Pulsating, Mass-Accreting Components in Algol-Type Eclipsing Binaries.- HD172189, a Cluster Member Binary System with a ? Scuti Component in the Field of View of COROT.- Eclipsing Binaries with Possible Light-Time Effect.- Eccentric Eclipsing Binary YY Sagittarii.- Photospheric Abundance Peculiarities in RS CVn Binaries.- Possible Light-Time Effect in the Eclipsing Binary System TY Boo.- Preliminary Photometric Evidence of Starspot Umbrae and Penumbrae on Late-Type Active Stars.- Late-Type Active Stars: Rotation & Companions.- Eclipsing Binaries in Open Clusters.- Eclipsing Binaries in Local Group Galaxies.- The First DIRECT Distance to a Detached Eclipsing Binary in M33.- Absolute Parameters of Early-Type Close Binaries in the LMC.- Searching for Planetary Eclipses in Open Clusters: NGC 7086.- Binaries with Total Eclipses in the LMC: Potential Targets for Spectroscopy.- Eclipsing Binary Stars in Nearby Galaxies.- EROS-II Variable Stars: Eclipsing Binaries in the EROS Microlensing Surveys.- First Results from ROTES: The ROtse Telescope Eclipsing-binary Survey.- Planets and Planet