Asteroseismology Across the HR Diagram: Proceedings of the Asteroseismology Workshop Porto, Portugal 1-5 July 2002

ISBN-13: 9781402011733 / Angielski / Twarda / 2003 / 294 str.

Michael J. Thompson; Michael J. Thompson; Margarida S. Cunha

Opis

We stand at the threshold of an exciting era of Asteroseismology. In a few months' time, the Canadian small-satellite asteroseismology mission MOST will be laun- ched. Danish and French missions MONS and COROT should follow, with the ESA mission Eddington following in 2007/8. Helioseismology has proved spec- tacularly successful in imaging the internal structure and dynamics of the Sun and probing the physics of the solar interior. Ground-based observations have detected solar-like oscillations on alpha Centauri A and other Sun-like stars, and diagnostics similar to those used in helioseismology are now being used to test and constrain the physics and evolutionary state of these stars. Multi-mode oscillations are being observed in an abundance of other stars, including slowly pulsating B stars (SPB stars), delta Scuti stars, Ap stars and the pulsating white dwarfs. New classes of pulsators continue to be discovered across the Hertzsprung-Russell diagram. For good reason it was decided to entitle our conference 'Asteroseismology Across the HR Diagram' . Yet the challenges still to be faced to make asteroseismology across the HR diagram a reality are formidable. Observation, data analysis and theory all pose hard problems to be overcome. In conceiving this meeting, the aim of the organisers was to facilitate a cross-fertilization of ideas and approaches between researchers working on different pulsators and with different areas of expertise. We venture to suggest that in this the conference was a great success.

Spis treści

Space and Ground Based Data for Asteroseismology.- STARE Results on a Single Field: Tens of New Pulsating Stars.- The Eddington Mission.- Present Observational Status of Solar-Type Stars.- Present Observational Status of the Intermediate Mass Stars.- Present Observational Status of High Mass Pulsating Stars.- Old Pulsators: White Dwarfs and their Immediate Precursors.- ? Scuti Pulsations in Pre-Main Sequence Stars.- Solar-like Oscillations in Semiregular Variables.- Discovery of a New Class of Pulsating Stars: Gravity Mode Pulsators among Subdwarf B Stars.- Recent Observations of PMS ? Scuti Stars.- Multicolour Photometry for Mode Identification.- High-Resolution Spectroscopy for Mode Identification.- Theoretical Clues for Mode Identification — Instability Ranges and Rotational Splitting Patterns.- Peakbagging for Solar-Like Stars.- Mode Identification from Line Profiles Using the Direct Fitting Technique.- Statistical Revision of the Moment Method.- An Improved Method of Photometric Mode Identification: Applications to Slowly Pulsating B, ? Cephei, ? Scuti and ? Doradus Stars.- Photometric Nonadiabatic Observables in Rotating ß Cephei Models.- Gravity Modes in Delta Scuti Stars.- Seismic Inference Using Genetic Algorithms.- Stellar Inversions.- On the Principal Asteroseismic Diagnostic Signatures.- Diagnostics of the Internal Structure of Stars Using the Differential Response Technique.- Stellar Convection.- Mixing and Diffusion in Stars.- Are Pulsation and Magnetic Axes Aligned in roAp Stars?.- Seismic Diagnostics of Stellar Convection Treatment from Oscillation Amplitudes of p-Modes.- Of Variability, or its Absence, in HgMn Stars.- A Study of the Solar-Like Properties of ? Hydri.- Giant Vibrations in Dip.- Stochastic Excitation of Gravity Waves by Overshooting Convection in Solar-Type Stars.- p-Mode Oscillations of ? Cen A.- Outstanding Issues for the Pulsation of Young Stars.- Outstanding Issues for Post-Main Sequence Evolution: Instability Strips and Excitation of Modes in Compact Pulsators.- Hot Subdwarfs: Magnetic, Oscillatory and other Physical Properties.- Nonlinearity of Nonradial Modes in Evolved Stars.- Summary: Problems, Connections and Expectations.