Surface Inhomogeneities on Late-Type Stars: Proceedings of a Colloquium Held at Armagh Observatory, Northern Ireland, 24–27 July 1990

ISBN-13: 9783662138847 / Angielski / Miękka / 2014 / 356 str.

Patrick B. Byrne;Dermott J. Mullan

Opis

The contributions in this volume discuss the magnetic structures in the outer atmospheres of active late-type stars, and in particular the various methods available for imaging surface features on these objects. Emphasis has been laid upon multiwavelength studies of the phenomena and the application of solar astrophysics to stellar objects. The book is recommended to research workers or postgraduate students in stellar astrophysics.

Spis treści

Surface inhomogeneities on late-type stars.- Models of starspots and results.- Information limit optimization: Starspot solutions for eclipsing RS CVn systems.- Major changes in polar starspots on V833 Tau.- Modelling stellar photospheric spots using spectroscopy.- Comparisons between Doppler Imaging and starspot modelling.- The polar-spot structure on HD26337.- Ultraviolet imaging of plage regions on late-type stars.- A new approach to doppler imaging of late-type stars.- Fluorescence-induced surface inhomogeneities and ejection and trapping of plasma by the K dwarf component of V471 Tauri.- Influence of starspots on internal stellar structure.- The synchronization of binary components from the motion of starspots.- Spectroscopic signatures of active regions on main sequence stars.- Physical models of solar and stellar spots.- Lithium in RS CVn binaries and related chromospherically active stars.- Relationship of starspots to other indicators of stellar activity.- Sunspots: An observational overview.- Mapping magnetic fields on rapidly rotating stars.- CaII K line observations of solar stars.- UV observations of sunspots.- Starspot lifetimes from long-term photometry.- The effect of surface inhomogeneities on total solar irradiance.- Oscillations & seismological diagnostics of sunspots.- Surface mapping of slowly rotating, cool stars using line bisector variations.- Surface brightness characteristics of W Ursae Majoris.- Automated photometric telescopes in the study of active stars.- Modelling inhomogeneities on B and A type magnetic peculiar stars.- Surface inhomogeneities on Capella.- Multi-site spectroscopic networks for the study of late-type stars.- Flaring and quiescent X-ray emission from the RS CVn system II Peg.- Summary and conclusions.- The August 1989 Spot lightcurve of II Peg and related flare activity.- Spot characteristics of contact binaries.- Observations of AB Dor at 8.4 GHz and interpretation.- Optical photometry & UV spectroscopy of CC Eri IN Nov 1989.- Numerical simulations of flares on late-type stars: Hydrodynamics and X-ray spectra.- Non-local thermal conduction in solar and stellar coronal loops.- Phase dependent variations of the H? line in chromospherically active stars.- Long-term variability of active stars.- Vilnius photometry of the typical and suspected chromospherically active stars.- The UV spectrum of the RS CVn binary SZ PSc.- Short time-scale changes in the V-band light-curve of II Peg: Flare, companion or prominence?.- Proposed upgrade of the McMath solar/stellar Telescope to a 4 m aperture.- Surface inhomogeneity on T Tau stars and the structure of their stellar winds.- On the dynamics of the emerging pre-flare magnetic configuration.- Spots of AR Lacertae.- Modelling of the large X-ray flare on II Peg observed with GINGA.- Light curve analysis of stars with more than one spot.- A semi-analytical model of stellar flares.- Sunspot group braking and photometric period variations in spotted stars.- Statistics of magnetic cycles in late-type single and close binary stars.- On an unusual correlation for flare stars.- On spectra of some pleiades flare stars.- Electron densities and temperatures in solar and stellar atmospheres.- On the AR Lac active regions.- A search for rotational modulation of the lithium line in spotted stars.- FK Comae — A decrease of the period?.- On variability of TZ Ori.- Li abundances and chromospheric activity in F, G and K southern stars.- X-rays from both components of the flare star binary Gliese 867.- Characterization of long-term X-ray variability in a sample of late-type stars.- Radial velocity measures of suspected chromospherically active and RSCVn-like stars.- Optical properties of cool stars discovered by EXOSAT.

O autorze

For the first time the various methods available for imaging surface structures of active late-type stars are presented. The book addresses astrophysicists and graduate students in astronomy.