The sun and cool stars : activity, magnetism, dynamos : proceedings of Colloquium no. 130 of the International Astronomical Union, held in Helsinki, Finland, 17-20 July 1990
The contributions in this volume report recent studies on the sun and late-type stars. Particular emphasis is placed on observations that are relevant to the question of large-scale magnetic activity, and also on the theoretical (dynamo) models for such activity. Experimental papers deal with surfac...
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| Edition sous un autre format: | • The Sun and Cool Stars: activity, magnetism, dynamos, Texte imprimé, 9783540539551 • The Sun and Cool Stars: activity, magnetism, dynamos, Texte imprimé, 9783662138106 • The Sun and Cool Stars: activity, magnetism, dynamos, Texte imprimé, 9783662138113 |
Indholdsfortegnelse:
- The confrontation of mean-field theories with numerical simulations
- On numerical studies of solar/stellar convection
- Turbulent Convection: A New Model
- Large scale convection in stars : Towards a model for the action of coherent structures
- Magnetoconvection patterns in rotating convection zones
- Stellar convection as a low Prandtl number flow
- Convective overshoot as a source of helicity
- Topological pumping in the lower overshoot layer
- Diffusion of particles, heat and magnetic fields in compressible turbulent media
- The spatial structure of homogeneous turbulence at high Reynolds number
- Compressible MHD in spherical geometry
- The role of overshoot in solar activity: A direct simulation of the dynamo
- Vector potential magnetic null points
- Magnetic tubes in overshooting compressible convection
- Convective cores in stellar models
- Rotational effects on Reynolds stresses in the solar convection zone
- Stable and unstable solutions of the nonlinear dynamo problem
- Nonlinear nonaxisymmetric dynamos for active stars
- Waves of Solar Activity
- Non-steady global magnetic fields in kinematic theory
- Asymptotic methods in the nonlinear mean-field dynamo
- Fractal flux tubes of the solar magnetic field
- ??-dynamos
- Fossil magnetic fields and activity of young stars
- The sun's internal differential rotation from helioseismology
- ?-effect, meridional flow and the differential solar rotation
- Differential rotation as an axisymmetric resonant mode of convection
- The solar internal rotation and its implications
- The toroidal magnetic field inside the Sun
- The transfer of large-scale magnetic field by radial inhomogeneity of the material density in the rotating convection zone
- Diagnostics of the solar dynamo using the observed pattern of surfacemagnetic fields
- The large-scale magnetic field in the global solar cycle: observational aspects
- Evolution of large and small scale magnetic fields in the sun
- The solar dynamo
- A topological model of the solar magnetic field reversals
- Solar internal rotation, the boundary layer dynamo and latitude distribution of activity belts
- Solar rotation over solar cycle 21
- Sun-as-a-star: Its convective signature and the activity cycle
- The hel ?10830 Å line as an indicator of the chromospheric and coronal activity of the sun
- The rotational modulation of ca II K in the sun
- The prolonged minima and maxima of solar activity
- The longer term evolution of magnetic field and mass flow in a decaying active region
- The main component analysis of the longitudinal distribution of solar activity
- Fe I line asymmetries and shifts caused by pressure broadening
- Rotation of large scale patterns on the solar surface as determined from filament and millimeter data
- Large scale patterns on the solar surface indicated by microwave observations
- The solar corona over the recent saros
- The history of activity of the Sun and its rotational period on the ZAMS
- The differential rotation and evolution of spots on UX Arietis from a sequence of Doppler images
- The art of surface imaging
- Surface imaging of El Eri
- Towards magnetic images of rapidly rotating late-type stars
- Chromospheric surface structures on El Eridani and HD 199178
- Activity, colour anomalies and temperature determination in solar-type stars
- Dynamo action in evolved stars
- The boundary between the magnetic fields of ap stars and the fields of solar-type stars
- Doppler mapping of CP-star surfaces with weak and strong magnetic fields
- Temperature variations on the surface of the Si-star CU Virginis.-Learning about stellar dynamos from long-term photometry of starspots
- Starspot activity on short-period RS CVn stars
- Variations in spottedness of photosphere and chromosphere of the flare star EV Lac
- Surface inhomogeneities on the W UMa star AC Bootis
- Long-term starspot behavior of BY Dra and EV Lac
- The spot activity of FK Comae Berenices
- On the existence of solar-type activity in the secondary components of cataclysmic variables
- Radial velocity variability of K giants
- Recent advances in the observation and analysis of stellar magnetic fields
- Limits on the magnetic flux of a pre-main sequence star
- Stellar zeeman analyses: Effects of multi-component atmospheres
- Multi-line Zeeman analysis
- A new technique to measure magnetic field strength in active stars
- Magnetic flux determination in late-type dwarfs
- Linear polarization and magnetic fields in cool stars
- Long-term polarimetric activity of the cool supergiant Cephei
- Polarimetric observations of active cool binaries
- Magnetic fields and filling factors in late-type stars: Predictions from dynamo theory
- Activity of relatively close binaries
- Two kinds of activity in late-type stars
- Ca II H and K and H?, and Li abundances in the pleiades late K main-sequence
- Is ? Boo AB a young or an evolved system? a model atmosphere analysis
- Spectroscopic analysis of HR 1099
- Recent advances in our understanding of chromospheric and coronal heating mechanisms
- Ca II H high-resolution spectral monitoring of active late-type dwarfs
- The onset of chromospheres in A-type stars: The altair affair
- H? and NaD line variability in RY Tauri
- He I 5876 å line in the study of chromospheric activity in F-type MS stars
- The age evolution of Ca II emission in late type stars
- Ca II H and Kspectroscopy of ER Vul
- The variations of the H? line of HD199178
- H? emission in the giant components of RS CVn systems
- Spectroscopy of southern active stars
- Full phase coverage of by Dra with the VLA
- Coronal magnetic fields of Algol binaries from microwave spectra
- On the coronal activity of RS CVn systems
- Flare rate spectra as a possibility of diagnostics of convection zones in stars
- Observations relating to stellar activity, magnetism and dynamos
- Concluding summary: Theoretical aspects.