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Advances in Helio and Asteroseismology : International Astronomical Union Symposia - J. Christensen-Dalsgaard

Advances in Helio and Asteroseismology

International Astronomical Union Symposia

By: J. Christensen-Dalsgaard (Editor), S. Frandsen (Editor)

Paperback Published: 1987
ISBN: 9789027726155
Number Of Pages: 628

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Proceedings of the 123rd Symposium of the International Astromonomical Union, held in Aarhus, Denmark, July 7-11, 1986.

An overview of helio- and asteroseismology.- 1. Observations of Solar Oscillations.- Helioseismology from the South Pole. The 1984/85 campaign.- Splitting of the low l solar p modes.- Helioseismic Observations at Stanford, 1977-1986.- Observations of solar global oscillations (1983 - 1985) and potential influence of terrestrial sources of errors.- Intermediate degree solar oscillations.- Measurements of solar internal rotation obtained with the Mt. Wilson 60-foot solar tower.- Solar equatorial rotation rate inferred from inversion of frequency splitting of high-degree modes.- Rotation in the solar convection zone inferred from Fabry-Perot observations of the 5-min oscillations.- Comparison of solar oscillation data obtained from a study of the Na and K Fraunhoffer absorption lines.- Response of the solar five-minute oscillations to a major flare.- Solar 5-min oscillation amplitude anisotropy and Doppler velocity systematics.- Ground based observations of solar luminosity oscillations.- Earth based observations of solar luminosity oscillations.- On the 160 minute oscillation.- Search for solar g-modes from 1981 to 1985.- Solar gravity modes from ACRIM/SMM irradiance data.- Limb darkening oscillations: the discrepancy with Doppler data and the 160-min period.- 2. Theory of Solar Oscillations.- Sensitivity of solar p-modes to solar envelope structure.- A solar model with turbulent diffusion mixing: surface abundances and oscillations.- The influence of a modified mixing-length theory and of an adopted description of the atmosphere on the solar five-minute oscillations.- Constraints on central solar conditions from helioseismology and neutrino counts.- Do solar models with weakly interacting massive particles reproduce the Stanford seismic data?.- The study of oscillations localized near a layer of density discontinuity in an example of solar model.- Inertial modes trapped in the solar convective envelope.- Non-newtonian forces and the observed solar oscillation spectrum.- Asymptotic properties of low degree gravity modes.- Stellar acoustic ray patterns.- An optimal approach to the inverse problem.- Inverse problem: acoustic potential vs acoustic length.- On the technique of the inversion of helioseismological data.- An attempt to determine the structure of the solar core from observed g-mode frequencies.- Inversion of asymptotic gravity-mode frequencies and its application to the Sun.- A search of the effects of magnetic field in the solar five-minute oscillations.- Magnetic perturbations to stellar oscillation eigenfrequencies.- Magnetic effects on solar p-modes.- The effect of toroidal magnetic fields in the overshoot layer on the eigenfrequencies of stellar oscillations.- The magnetic field inside the Sun.- On the implications of the symmetric component of the frequency splitting reported by Duvall, Harvey and Pomerantz.- Sunspot seismology.- Oscillations in sunspot umbra, -penumbra and the surrounding photosphere.- The energy conversions and enhancement caused by the unsteady plasma motion in the active region.- Radial and non-radial oscillations of spherically symmetric stellar systems.- 3. Longterm Variations in the Sun.- Time variations of the frequencies of low-degree solar p modes.- Solar cycle dependence of solar p modes.- The solar oscillations spectrum and the solar cycle.- The 13 day period oscillation and the solar cycle.- Variations in the mean line of sight velocity of the Sun: 1976-1985.- Study of long period global oscillations of Sun through spherical harmonic Fourier analysis of sunspot activity.- Long periods in diameter, irradiance and activity of the Sun.- Solar diameter and solar rotation during the Maunder minimum.- 4. Asteroseismology: Results and Prospects.- Asteroseismology: results and prospects.- Evidence for global pressure oscillations in Procyon and ? Centauri.- A photometric search for '5-min' oscillations in the components of Alpha Centauri and two other double stars.- A spectroscopic search for oscillations in the 769.9 nm potassium line of Procyon.- The rich p-mode pulsation spectrum of HD 60435.- Search for oscillations in some Ap stars.- A search for rapidly oscillating Ap stars in the northern hemisphere.- The radius and the pulsation constant of the primary of Spica.- A survey for Doppler-shift oscillations in K giants.- Modeling the global oscillations of Epsilon Eridani.- Stellar models of Epsilon Eridani constrained by stellar seismology.- Internal constitution and oscillation spectrum of Procyon.- Helium diffusion in rapidly oscillating Ap stars.- A Hertzsprung-Russell diagram for stellar oscillations.- Can stellar mass be measured by asteroseismology?.- 5. Seismological Investigations of Compact Stars.- Seismological investigations of compact stars.- An improved limit for the rate of period change in the ZZ Ceti star G117-B15A.- The stellar seismology of the hot white dwarf star PG1159-035.- Pulsations of White Dwarf Stars with Thick Hydrogen or Helium Surface Layers.- The non linear dynamic of the ZZ Ceti variable GD 66.- 6. Excitation and Damping of Solar and Stellar Oscillations.- Excitation and damping of solar and stellar oscillations.- What do the observations tell us about the excitation of solar oscillation modes?.- The role of nuclear reactions in the excitation of stellar oscillations.- On the excitation of solar five-minute oscillations.- Influence of the perturbation of the Reynolds tensor on the stability of the solar 5 min oscillations.- Interaction of convection and oscillations in the solar atmosphere: numerical results.- Gravity wave generation by large scale bubbles.- The evolution to steady nonlinear pulsation in stellar models.- Finally a double-mode RR Lyrae model?.- Overstable convection in a non-uniform magnetic field.- The critical mass for the overstability of massive zero-age main sequence stars.- 7. Oscillations in the Solar Atmosphere.- Diagnosis of the solar atmosphere using solar oscillations.- Chromospheric seismology.- Infrared Helioseismology: Detection of the chromospheric mode.- Variations of the solar limb brightness with the oscillations.- Oscillatory properties of meso-scale intensity structures at chromospheric level.- On the energy of short period acoustic waves in the solar atmosphere.- Convective overshoot and upper boundary conditions.- Variation of the generalized Compton red shift in the Sun.- 8. Techniques for Observing Solar Oscillations.- Techniques for observing solar oscillations.- Continuous magnetic calibration of (velocity) sensitivity of oscillation spectrometers.- Full-Disk solar Dopplergrams observed with a 1024x1024 Pixel CCD Camera.- Performance of a stabilized Fabry-Perot solar analyzer.- Infrared heterodyne spectroscopy: a tool for helioseismology.- A Bayesian approach to ridge fitting in the ?-k diagram of the solar five-minute oscillations.- Automated p-mode identification using Bayes' theorem.- 9. Techniques for Observing Stellar Oscillations.- Techniques for observing stellar oscillations.- Sodium cell spectrophotometer for detection of stellar oscillations.- Multiplexed interferometric stellar oscillation spectrometry - MISOS.- The precision calcium photometer: a new instrument for astroseismology.- 10. Network and Space Observations of Solar and Stellar Oscillations.- Space observations of solar and stellar oscillations.- Experience in operating a limited global network of stations measuring full-disc oscillations of the Sun.- Requirements of a network telescope.- Helioseismology from space, the SOHO project.- Prospect for stellar seismology on board an interplanetary spacecraft.- Observations of stellar oscillations with the Hubble Space Telescope.- 11. Summary of the Conference.- Overview of the conference: implications of seismological data for astrophysics.- 12. The Etcetera of Astronomical Seismology.- The discovery of late twentieth century mod man.- An extremely high 'Q'ueue value applied to seismological meetings.- Author Index.

ISBN: 9789027726155
ISBN-10: 9027726159
Series: International Astronomical Union Symposia
Audience: General
Format: Paperback
Language: English
Number Of Pages: 628
Published: 1987
Publisher: Springer
Country of Publication: NL
Dimensions (cm): 25.4 x 17.78  x 3.23
Weight (kg): 1.08