Variable Stars as Essential Astrophysical Tools

Pulsating and eccentric binary stars play a fundamentally important role in deciphering the mass distribution within stars. The present volume reviews the fundamental concepts of both radial and nonradial oscillations in the stars, including the Sun. Helio- and astroseismological results are reviewed, from the basics to the most recent developments. A new theory is presented, which seems to explain the mechanism of the light and radial velocity variations of recently discovered Ap stars. This textbook covers almost all kinds of variable stars of widely different characteristics. It will serve as a reference text for a very long time to come, not only for specialists but also for undergraduate students of physics and astronomy.

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I Basic Aspects of Stellar Structure and Pulsation.- II an Introduction to Helioseismology.- Solar Models and Helioseismology.- III Astrophysical Equation of State and Opacity.- IV Introduction to Asteroseismology of ? Scuti Stars.- The Pulsational Behaviour of Variable Stars in The Lower Part of the Instability Strip.- 57 Tau a 6 Scuti Star in Binary System in the Hyades.- V Evolution and Hydrodynamics of Rotating Stars.- VI Techniques of Collection, Reduction and Analysis of Data of Pulsating Stars I: Multi-Band Multi-Longitude Campaigns.- Techniques of Collection, Reduction and Analysis of Data of Pulsating Stars II: Cluster Surveys, Multi-Band Observations, New Approaches for ? Doradus and ? Scuti Stars.- Simultaneous Light Curve, Color Curve and Line Profile Fitting for Pulsating Stars. Objects in the lower part of Cepheid Instability Strip ? Scuti and ? Doradus Stars.- VII AN INTRODUCTION TO Ap STARS, roAp STARS AND THE ASTEROSEISMOLOGY OF roAp STARS.- Evidence for, and Development of, the Oblique Pulsator Model.- Long-term Monitoring of Cyclic Frequency Variability in roAp Stars.- Multi-color Observations and Atmospheric Level Effects in roAp Stars.- Asteroseismology Versus Astrometry Testing p-mode predictions for roAp stars against Hipparcos.- Pulsational Radial Velocity Studies of roAp Stars y Equulei, 33 Librae, H.D. 134214, HR 1217, and HD 122970.- Asteroseismology with a Spatial Resolution: Prospects for Rapid RV-Spectroscopy of roAp Stars.- VIII Asteroseismology of Cepheids.- On the Normalization of Cepheid Period-Luminosity Relationships.- IX theoretical models of ? doradus variables.- Gamma Doradus Stars: Observational Constraints to Theoretical Models.- X Trend Analysis of Long Period Variables.- Absolute Magnitudes of M Type Semi-regular Variables in Hipparcos Catalogue.- XI Pulsating White Dwarf Stars.- XII The O-C Diagram.- Period Changes as a Tool to Study Stellar Evolution.- XIII Binary Stars Apsidal Motion in Close Binaries.- Apsidal Motion Studies for DI Her.- Irradiation Effects and Light Curve Solution of Close Hot Binaries.- Orbital Period Variations of Some Algol-Type Binaries.- Period Changes as a Tool to Study Unseen Components Around Eclipsing Binaries.- Asymmetry in the Light Curves of Massive Binaries.- On the Gravity Darkening of Eclipsing Variables of the W UMa Type.- UBV Photometry of the Massive Eclipsing Binary TT Aurigae.- Orbital Period Changes and Global Evolution of Contact Binaries.- Detached Eclipsing Binaries as a Test of Stellar Evolutionary Models.- XIV Cool Close Binaries and Rs CVn Stars Modelling Photospheres of Active Stars - What Can We Learn from Photospheric Spot Modelling?.- H ? Line and Photometric Variability in Magnetical Active Stars.- On the Connection Between Magnetic Activity and Orbital Period Modulation in Close Binaries.- Multi-Site Spectroscopy on FK Comae: An Extreme Activity Laboratory.- XV High Energy Binaries and Exotic Objects Cataclysmic Variables as a Magnetic Laboratory.- Accretion Disk Winds in Dwarf Novae.- Apparent Changes of Orbital Period due to Outbursts in Symbiotic Binaries.- Statistical Investigations of High and Low Mass X-Ray Binaries.- Application of the Hot White Dwarf Atmosphere Models to the X-Ray Data of Classical Novae.- XVI Satellite Observations Flares and Large Scale Evolution of a Solar Active Region Observed in 1996 by GOES, SOHO and YOHKOH: Implications for X-Ray stellar Variability.- Stellar Astrophysics With a Wide Field Optical Camera in Space.- Star Index.

Proceedings of the NATO Advanced Study Institute, held in Çesme, Turkey, from August 31 - September 10, 1998