Advances In Helio- And Asteroseismology: Proceedings Of The 123th [sic] Symposium Of The International Astronomical Union, Held In Aarhus, Denmark, July 7-11, 1986 Helio- And Astroseismology

Helio- and asteroseismology study the interior of the Sun and other stars, by means of observations of oscillations on their surfaces. The last 10 years in the study of the solar interior, to a has witnessed a very rapid evolution point where we can now contemplate investigating the physical state of matter, or the details of rotation and other large-scale motion, in the Sun. The stellar studies are in some respects at the point of the solar studies 10 years ago, but appear poised to take off. Thus the time was deemed ripe for lAO Symposium No 123, to assess the present status of this work, and plan for its future development. Apart from the seismic data, few observations are available to provide information about stellar interiors. Detailed studies, by spectral analysis, can be made of stellar surface properties, including atmospheric temperature and chemical composition. However, the stellar radiative spectrum is almost entirely fixed by the mass, luminosity, radius and surface rotation of the star, and contains essentially no other information about the interior. An important test of stellar evolution theory is provided by observations of stel­ lar clusters, whose members can reasonably be assumed to have the same age and chemical composition. The location of such stars in a HR diagram, where luminosity is plotted against the effective temperature, can roughly be understood in terms of stellar evolution calculations. Front Matter....Pages i-xxi Front Matter....Pages 1-1 An Overview Of Helio- and Asteroseismology....Pages 3-19 Front Matter....Pages 19-19 Helioseismology from the South Pole The 1984/85 campaign....Pages 21-23 Splitting of the Low l Solar p Modes....Pages 25-28 Helioseismic Observations at Stanford, 1977–1986....Pages 29-32 Observations of Solar Global Oscillations (1983–1985) And Potential Influence of Terrestrial Sources of Errors....Pages 33-36 Intermediate Degree Solar Oscillations....Pages 37-40 Measurements of Solar Internal Rotation Obtained with the Mt. Wilson 60-Foot Solar Tower....Pages 41-44 Solar Equatorial Rotation Rate Inferred From Inversion of Frequency Splitting of High-Degree Modes....Pages 45-48 Rotation in the Solar Convection Zone Inferred from Fabry-Perot Observations of the 5-Min Oscillations....Pages 49-52 Comparison of Solar Oscillation Data Obtained from a Study of the Na and K Fraunhoffer Absorption Lines....Pages 53-57 Response of the Solar Five-Minute Oscillations to a Major Flare....Pages 59-62 Solar 5-min Oscillation Amplitude Anisotropy and Doppler Velocity Systematics....Pages 63-65 Ground Based Observations of Solar Luminosity Oscillations....Pages 67-69 Earth Based Observations of Solar Luminosity Oscillations....Pages 71-74 On the 160 Minute Oscillation....Pages 75-78 Search For Solar G-Modes from 1981 to 1985....Pages 79-82 Solar Gravity Modes from Acrim/Smm Irradiance Data....Pages 83-86 Limb Darkening Oscillations: The Discrepancy with Doppler Data and the 160-Minute Period....Pages 87-88 Front Matter....Pages 89-89 Sensitivity of Solar P-Modes To Solar Envelope Structure....Pages 91-94 A Solar Model With Turbulent Diffusion Mixing: Surface Abundances And Oscillations....Pages 95-98 Front Matter....Pages 89-89 The Influence of a Modified Mixing-Length Theory and of an Adopted Description of the Atmosphere on the Solar Five-Minute Oscillations....Pages 99-103 Constraints on Central Solar Conditions from Helioseismology and Neutrino Counts....Pages 105-109 Do Solar Models with Weakly Interacting Massive Particles Reproduce the Stanford Seismic Data?....Pages 111-114 The Study of Oscillations Localized Near a Layer of Density Discontinuity in an Example of Solar Model....Pages 115-116 Inertial Modes Trapped in the Solar Convective Envelope....Pages 117-117 Non-Newtonian Forces and the Observed Solar Oscillation Spectrum....Pages 119-119 Asymptotic Properties of Low Degree Gravity Modes....Pages 121-124 Stellar Acoustic Ray Patterns....Pages 125-128 An Optimal Approach to the Inverse Problem....Pages 129-132 Inverse Problem: Acoustic Potential vs Acoustic Length....Pages 133-136 On the Technique of the Inversion of Helioseismological Data....Pages 137-140 An Attempt to Determine the Structure of the Solar Core from Observed G-Mode Frequencies....Pages 141-146 Inversion of Asymptotic Gravity-Mode Frequencies and its Application to the Sun....Pages 147-150 A Search of the Effects of Magnetic Field in the Solar Five-Minute Oscillations....Pages 151-154 Magnetic Perturbations to Stellar Oscillation Eigenfrequencies....Pages 155-160 Magnetic Effects on Solar p-Modes....Pages 161-165 The Effect of Toroidal Magnetic Fields in the Overshoot Layer on the Eigenfrequencies of Stellar Oscillations....Pages 167-170 The Magnetic Field Inside the Sun....Pages 171-174 On the Implications of the Symmetric Component of the Frequency Splitting Reported by Duvall, Harvey and Pomerantz....Pages 175-180 Sunspot Seismology....Pages 181-182 Front Matter....Pages 89-89 Oscillations in Sunspot Umbra, -Penumbra and the Surrounding Photosphere....Pages 183-186 The Energy Conversions and Enhancement Caused by the Unsteady Plasma Motion in the Active Region....Pages 187-190 Radial and Non-Radial Oscillations of Spherically Symmetric Stellar Systems....Pages 191-194 Front Matter....Pages 195-195 Time Variations of the Frequencies of Low-Degree Solar P-Modes....Pages 197-200 Solar Cycle Dependence of Solar p Modes....Pages 201-204 The Solar Oscillations Spectrum and the Solar Cycle....Pages 205-209 The 13 Day Period Oscillation and the Solar Cycle....Pages 211-214 Variations in the Mean Line of Sight Velocity of the Sun: 1976 – 1985....Pages 215-218 Study of Long Period Global Oscillations of Sun Through Spherical Harmonic Fourier Analysis of Sunspot Activity....Pages 219-222 Long Periods in Diameter, Irradiance and Activity of the Sun....Pages 223-226 Solar Diameter and Solar Rotation During the Maunder Minimum....Pages 227-230 Front Matter....Pages 231-231 Asteroseismology: Results and Prospects....Pages 233-247 Evidence for global pressure oscillations in Procyon and α Centauri....Pages 249-252 A Photometric Search for ‘5-min’ Oscillations in the Components of Alpha Centauri and Two Other Double Stars....Pages 253-254 A Spectroscopic Search for Oscillations in the 769.9 nm Potassium Line of Procyon....Pages 255-259 The Rich p-Mode Pulsation Spectrum of HD 60435....Pages 261-264 Search for Oscillations in Some Ap Stars....Pages 265-268 A Search for Rapidly Oscillating Ap Stars in the Northern Hemisphere....Pages 269-272 The Radius and the Pulsation Constant of the Primary of Spica....Pages 273-276 A Survey for Doppler-Shift Oscillations in K Giants....Pages 277-280 Front Matter....Pages 231-231 Modeling The Global Oscillations OF Epsilon Eridani....Pages 281-284 Stellar Models of ε Eridani Constrained by Stellar Seismology....Pages 285-286 Internal Constitution And Oscillation Spectrum Of Procyon....Pages 287-289 Helium Diffusion In Rapidly Oscillating Ap Stars....Pages 291-294 A Hertzsprung-Russell Diagram For Stellar Oscillations....Pages 295-298 Can Stellar Mass be Measured by Asteroseismology?....Pages 299-302 Front Matter....Pages 303-303 Seismological Investigations of Compact Stars....Pages 305-324 An Improved Limit for the Rate of Period Change in the ZZ Ceti Star G117-B15A....Pages 325-328 The Stellar Seismology of the Hot White Dwarf Star PG1159-035....Pages 329-332 Pulsations of White Dwarf Stars with Thick Hydrogen or Helium Surface Layers....Pages 333-337 The Non Linear Dynamic of the ZZ Ceti Variable GD 66....Pages 339-342 Front Matter....Pages 343-343 Excitation and Damping of Solar and Stellar Oscillations....Pages 345-357 What do the Observations Tell us About the Excitation of Solar Oscillation Modes?....Pages 359-362 The Role of Nuclear Reactions in the Excitation of Stellar Oscillations....Pages 363-369 On the Excitation of Solar Five-Minute Oscillations....Pages 371-374 Influence of the Perturbation of the Reynolds Tensor on the Stability of the Solar 5 Minute Oscillations....Pages 375-378 Interaction of Convection and Oscillations in the Solar Atmosphere: numerical results....Pages 379-382 Gravity Wave Generation by Large Scale Bubbles....Pages 383-386 The Evolution to Steady Nonlinear Pulsation in Stellar Models....Pages 387-391 Finally a Double-Mode RR Lyrae Model?....Pages 393-394 Front Matter....Pages 343-343 Overstable Convection in a Non-Uniform Magnetic Field....Pages 395-398 The Critical Mass for the Overstability of Massive Zero-Age Main Sequence Stars....Pages 399-402 Front Matter....Pages 403-403 Diagnosis of the Solar Atmosphere Using Solar Oscillations....Pages 405-419 Chromospheric Seismology....Pages 421-424 Infrared Helioseismology: Detection of the Chromospheric Mode....Pages 425-428 Variations of the Solar Limb Brightness with the Oscillations....Pages 429-432 Oscillatory Properties of Meso-Scale Intensity Structures at Chromospheric Level....Pages 433-437 On the Energy of Short Period Acoustic Waves in the Solar Atmosphere....Pages 439-442 Convective Overshoot And Upper Boundary Conditions....Pages 443-446 Variation of the Generalized Compton Red Shift in the Sun....Pages 447-450 Front Matter....Pages 451-451 Techniques for Observing Solar Oscillations....Pages 453-465 Continuous Magnetic Calibration of (Velocity) Sensitivity of Oscillation Spectrometers....Pages 467-469 Full-Disk Solar Dopplergrams Observed with a 1024 X 1024-Pixel CCD Camera....Pages 471-474 Performance of a Stabilized Fabry-Perot Solar Analyzer....Pages 475-479 Infrared Heterodyne Spectroscopy: A Tool for Helioseismology....Pages 481-484 A Bayesian Approach to Ridge Fitting in the ω - k Diagram of the Solar Five-Minute Oscillations....Pages 485-489 Automated p-Mode Identification Using Bayes’ Theorem....Pages 491-494 Front Matter....Pages 495-495 Techniques For Observing Stellar Oscillations....Pages 497-511 Sodium cell spectrophotometer for detection of stellar oscillations....Pages 513-516 Multiplexed Interferometric Stellar Oscillation Spectrometry — MISOS....Pages 517-520 Front Matter....Pages 495-495 The Precision Calcium Photometer: A New Instrument for Astroseismology....Pages 521-524 Front Matter....Pages 525-525 Space Observations of Solar and Stellar Oscillations....Pages 527-534 Experience in Operating a Limited Global Network of Stations Measuring Full-Disc Oscillations of the Sun....Pages 535-539 Requirements of a Network Telescope....Pages 541-544 Helioseismology from Space, the SOHO Project....Pages 545-548 Prospect for Stellar Seismology on Board an Interplanetary Spacecraft....Pages 549-553 Observations of Stellar Oscillations with the Hubble Space Telescope....Pages 555-558 Front Matter....Pages 559-559 Overview of the Conference: Implications of Seismological Data for Astrophysics....Pages 561-575 Front Matter....Pages 577-577 The Discovery of Late Twentieth Century Mød Man....Pages 579-583 An Extremely High ‘Q’ueue Value Applied to Seismological Meetings....Pages 585-585 Back Matter....Pages 587-604 1. Observations Of Solar Oscillations -- 2. Theory Of Solar Oscillations -- 3. Longterm Variations In The Sun -- 4. Asteroseismology: Results And Prospects -- 5. Seismological Investigations Of Compact Stars -- 6. Excitation And Damping Of Solar And Stellar Oscillations -- 8. Techniques For Observing Solar Oscillations -- 9. Techniques For Observing Stellar Oscillations -- 10. Network And Space Observations Of Solar And Stellar Oscillations -- 11. Summary Of The Conference -- 12. The Etcetera Of Astronomical Seismology. Edited By Jørgen Christensen-dalsgaard, Søren Frandsen. At Head Of Title: International Astronomical Union. Includes Bibliographies And Indexes. Includes Bibliographical References And Indexes. Proceedings of the 123rd Symposium of the International Astromonomical Union, held in Aarhus, Denmark, July 7-11, 1986.