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The Sun and Cool Stars: activity, magnetism, dynamos [[electronic resource] ] : Proceedings of Colloquium No. 130 of the International Astronomical Union Held in Helsinki, Finland, 17–20 July 1990 / / edited by I. Tuominen, D. Moss, G. Rüdiger
| The Sun and Cool Stars: activity, magnetism, dynamos [[electronic resource] ] : Proceedings of Colloquium No. 130 of the International Astronomical Union Held in Helsinki, Finland, 17–20 July 1990 / / edited by I. Tuominen, D. Moss, G. Rüdiger |
| Edizione | [1st ed. 1991.] |
| Pubbl/distr/stampa | Berlin, Heidelberg : , : Springer Berlin Heidelberg : , : Imprint : Springer, , 1991 |
| Descrizione fisica | 1 online resource (X, 530 p. 71 illus., 1 illus. in color.) |
| Disciplina | 520 |
| Collana | Lecture Notes in Physics |
| Soggetto topico |
Observations, Astronomical
Astronomy—Observations Astrophysics Geophysics Astronomy, Observations and Techniques Astrophysics and Astroparticles Geophysics/Geodesy |
| ISBN | 3-540-46483-2 |
| Formato | Materiale a stampa  |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto | 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 surface magnetic 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 µ 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 K spectroscopy 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. |
| Record Nr. | UNINA-9910257448603321 |
| Berlin, Heidelberg : , : Springer Berlin Heidelberg : , : Imprint : Springer, , 1991 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
The Sun and Cool Stars: activity, magnetism, dynamos [[electronic resource] ] : Proceedings of Colloquium No. 130 of the International Astronomical Union Held in Helsinki, Finland, 17–20 July 1990 / / edited by I. Tuominen, D. Moss, G. Rüdiger
| The Sun and Cool Stars: activity, magnetism, dynamos [[electronic resource] ] : Proceedings of Colloquium No. 130 of the International Astronomical Union Held in Helsinki, Finland, 17–20 July 1990 / / edited by I. Tuominen, D. Moss, G. Rüdiger |
| Edizione | [1st ed. 1991.] |
| Pubbl/distr/stampa | Berlin, Heidelberg : , : Springer Berlin Heidelberg : , : Imprint : Springer, , 1991 |
| Descrizione fisica | 1 online resource (X, 530 p. 71 illus., 1 illus. in color.) |
| Disciplina | 520 |
| Collana | Lecture Notes in Physics |
| Soggetto topico |
Observations, Astronomical
Astronomy—Observations Astrophysics Geophysics Astronomy, Observations and Techniques Astrophysics and Astroparticles Geophysics/Geodesy |
| ISBN | 3-540-46483-2 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto | 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 surface magnetic 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 µ 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 K spectroscopy 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. |
| Record Nr. | UNISA-996466718303316 |
| Berlin, Heidelberg : , : Springer Berlin Heidelberg : , : Imprint : Springer, , 1991 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. di Salerno | ||
| ||
Variability of Active Galaxies [[electronic resource] ] : Proceedings of a Workshop of the Sonderforschungsbereich 328 Held at Heidelberg, Germany, 3–5 September 1990 / / edited by Wolfgang J. Duschl, Stefan J. Wagner, Max Camenzind
| Variability of Active Galaxies [[electronic resource] ] : Proceedings of a Workshop of the Sonderforschungsbereich 328 Held at Heidelberg, Germany, 3–5 September 1990 / / edited by Wolfgang J. Duschl, Stefan J. Wagner, Max Camenzind |
| Edizione | [1st ed. 1991.] |
| Pubbl/distr/stampa | Berlin, Heidelberg : , : Springer Berlin Heidelberg : , : Imprint : Springer, , 1991 |
| Descrizione fisica | 1 online resource (XII, 312 p. 56 illus.) |
| Disciplina | 523.1/12 |
| Collana | Lecture Notes in Physics |
| Soggetto topico |
Observations, Astronomical
Astronomy—Observations Astrophysics Geophysics Astronomy, Observations and Techniques Astrophysics and Astroparticles Geophysics/Geodesy |
| ISBN | 3-540-46325-9 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto | Have all questions been asked? -- Line and continuum variability in NGC 4151 -- The optical, ultraviolet and X-ray variations in NGC 4151 -- Mapping the BLR in NGC 5548 & NGC 4151 -- Ground-based studies of emission-line variability: Recent results for NGC 5548 and future plans -- Variability of line profiles in NGC 5548 -- Continuum variability in NGC 5548: Implications for theoretical models -- Variability in Markarian 279 -- A search for variability in PKS 1302-102 -- Meteorology of the broad line region -- An atlas of 2-dimensional transfer functions of the Broad Line Region -- Limits on the expansion of the radio source OQ 208 in Mkn 668 -- BLR models and the L-M relation for AGNs -- Variability of BL Lac objects in the radio regime -- Intraday radio variability of quasars and BL Lac objects -- The high frequency properties of synchrotron radiation -- Synchrotron source models and the infrared-optical variability of blazars -- Rapid variability of BL Lac objects in the optical regime -- UV variability of blazars -- The connection between Frequency Dependent Polarization (FDP) and growing radio shocks in blazars -- Optical observations of rapid variability in the QSO PG 0117+213 -- The connection between blazars and compact radio sources -- VLBI knots and superluminal motion -- Relativistic jet models and variable knot emission -- Particle acceleration and variability: Magnetic reconnection in AGN -- Electron-ion coupling in Compton-heated plasmas -- Variable radio sources and the two-fluid models -- Infrared variability of active nuclei -- Continuum variability in quasars and Seyfert galaxies -- The variability of Ly-alpha in 3C273 -- The electromagnetic spectrum of the radio-quiet quasar 1821+643 and comparison with 3C 273 -- Variability of active galactic nuclei: A theorist's view -- The stability of thick disks -- Brightness and color variations of accretion disks: Implications for the parameters -- Structure and variability in broad absorption lines of quasar spectra -- Are the broad emission lines of quasars affected by gravitational microlensing? -- Gravitational microlensing and the Hamburg quasar monitoring program -- Lensing of BL Lac objects. |
| Record Nr. | UNISA-996466709703316 |
| Berlin, Heidelberg : , : Springer Berlin Heidelberg : , : Imprint : Springer, , 1991 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. di Salerno | ||
| ||
Variability of Active Galaxies [[electronic resource] ] : Proceedings of a Workshop of the Sonderforschungsbereich 328 Held at Heidelberg, Germany, 3–5 September 1990 / / edited by Wolfgang J. Duschl, Stefan J. Wagner, Max Camenzind
| Variability of Active Galaxies [[electronic resource] ] : Proceedings of a Workshop of the Sonderforschungsbereich 328 Held at Heidelberg, Germany, 3–5 September 1990 / / edited by Wolfgang J. Duschl, Stefan J. Wagner, Max Camenzind |
| Edizione | [1st ed. 1991.] |
| Pubbl/distr/stampa | Berlin, Heidelberg : , : Springer Berlin Heidelberg : , : Imprint : Springer, , 1991 |
| Descrizione fisica | 1 online resource (XII, 312 p. 56 illus.) |
| Disciplina | 523.1/12 |
| Collana | Lecture Notes in Physics |
| Soggetto topico |
Observations, Astronomical
Astronomy—Observations Astrophysics Geophysics Astronomy, Observations and Techniques Astrophysics and Astroparticles Geophysics/Geodesy |
| ISBN | 3-540-46325-9 |
| Formato | Materiale a stampa |
| Livello bibliografico | Monografia |
| Lingua di pubblicazione | eng |
| Nota di contenuto | Have all questions been asked? -- Line and continuum variability in NGC 4151 -- The optical, ultraviolet and X-ray variations in NGC 4151 -- Mapping the BLR in NGC 5548 & NGC 4151 -- Ground-based studies of emission-line variability: Recent results for NGC 5548 and future plans -- Variability of line profiles in NGC 5548 -- Continuum variability in NGC 5548: Implications for theoretical models -- Variability in Markarian 279 -- A search for variability in PKS 1302-102 -- Meteorology of the broad line region -- An atlas of 2-dimensional transfer functions of the Broad Line Region -- Limits on the expansion of the radio source OQ 208 in Mkn 668 -- BLR models and the L-M relation for AGNs -- Variability of BL Lac objects in the radio regime -- Intraday radio variability of quasars and BL Lac objects -- The high frequency properties of synchrotron radiation -- Synchrotron source models and the infrared-optical variability of blazars -- Rapid variability of BL Lac objects in the optical regime -- UV variability of blazars -- The connection between Frequency Dependent Polarization (FDP) and growing radio shocks in blazars -- Optical observations of rapid variability in the QSO PG 0117+213 -- The connection between blazars and compact radio sources -- VLBI knots and superluminal motion -- Relativistic jet models and variable knot emission -- Particle acceleration and variability: Magnetic reconnection in AGN -- Electron-ion coupling in Compton-heated plasmas -- Variable radio sources and the two-fluid models -- Infrared variability of active nuclei -- Continuum variability in quasars and Seyfert galaxies -- The variability of Ly-alpha in 3C273 -- The electromagnetic spectrum of the radio-quiet quasar 1821+643 and comparison with 3C 273 -- Variability of active galactic nuclei: A theorist's view -- The stability of thick disks -- Brightness and color variations of accretion disks: Implications for the parameters -- Structure and variability in broad absorption lines of quasar spectra -- Are the broad emission lines of quasars affected by gravitational microlensing? -- Gravitational microlensing and the Hamburg quasar monitoring program -- Lensing of BL Lac objects. |
| Record Nr. | UNINA-9910257422203321 |
| Berlin, Heidelberg : , : Springer Berlin Heidelberg : , : Imprint : Springer, , 1991 | ||
| Materiale a stampa | ||
| Lo trovi qui: Univ. Federico II | ||
| ||
