Pulsation and Mass Loss in Stars : Proceedings of a Workshop Held in Trieste, Italy, September 14–18, 1987

Stellar mass loss is an essential part of the cycling of material from the interstellar medium into stars and back, and must be understood if we are to model processes on galactic to cosmological scales. The study of stellar winds and the effects of stellar mass loss has reached a particularly exciting stage where observational capabilities are increasingly able to provide interesting constraints on models and theories. Recent resu1ts from theoretical and observational work for both hot and cool stars with substantial winds have led to the suggestion that a combination of pulsation with other mechanisms makes for particularly efficient mass loss from stars. This provided the original motivation for the organization of this workshop. The conference was organized along relatively conventional lines according to the types of objects being scrutinized. However the true unity of the proceedings comes from the interplay of the mechanisms involved. For example, for the cool, luminous Mira variables, pulsation leads to shock waves that extend the atmosphere, enhancing dust formation; radiation pressure on dust drives the wind, cooling the atmosphere and in some cases suppressing the shocks. Similarly for the Be stars, both pulsation (in this case, non-radial) and radiation pressure (due to UV resonance lines) are expected to be important, and this expectation is at least qualitatively borne out by the observations. Front Matter....Pages i-xii Front Matter....Pages 1-1 The Mechanism of Mass Loss from Pulsating Cool Stars....Pages 3-25 The Fourier Decomposition Technique: Interpreting the Variations of Pulsating Stars....Pages 27-50 The Winds from Cool Stars Including the Sun....Pages 51-72 Summary by M. Hack and L. A. Willson of Selected Short Contributions on Cool Stars by....Pages 73-79 Front Matter....Pages 81-81 Circumstellar Matter and Winds in Young Stars....Pages 83-104 Winds from Low Mass Protostars....Pages 105-118 Evolution of the Outer Atmospheres of Pre-Main-Sequence Stars....Pages 119-132 The Fu Orionis Variables: Accretion and Mass Loss....Pages 133-154 Front Matter....Pages 155-155 Introduction to Helio- and Astro-Seismology....Pages 157-161 Observations of Solar Oscillations....Pages 163-179 Solar and Stellar Nonradial Oscillations, Wave Propagation and Heating of the Upper Atmosphere....Pages 181-206 Summary by S. Jordan and L. A. Willson of Selected Contributions on Helio- and Astero- Seismology....Pages 207-208 Front Matter....Pages 209-209 Mass Loss and Non-Radial Pulsations in Be Stars....Pages 211-227 Time-Dependent Mass Loss from Hot Stars with and without Radiative Driving....Pages 229-249 Nonradial Pulsations and Early Be Stars: Angular Momentum Considerations....Pages 251-274 Summary by R. Polidan of Selected Contributions on Hot Stars by....Pages 275-281 Front Matter....Pages 283-283 Pulsation and Mass Loss: Evolutionary Considerations....Pages 285-311 Front Matter....Pages 313-313 Summary of the Workshop....Pages 315-319 Back Matter....Pages 321-336