Flare stars in star clusters, associations, and the solar vicinity : proceedings of the 137th Symposium of the International Astronomical Union, held in Byurakan (Armenia), U.S.S.R., October 23-27, 1989

I. Flare Stars. Optical Observations and Flare Statistics. - Flare stars in star clusters, associations and solar vicinity (Invited paper). - The flare activity of AD Leo1972-1988. - Photometrical, spectral and radio monitoring for EV Lac in 1986 and 1987. - Electrophotometric observations of the EV Lac flares in U, H? and H? - Rapid spike flares on AD Leo and EV Lac. - Photoelectric observations of flares on UV Ceti. - Two-colour observations of spikes and flares with high time resolution. - A short-lived flare on EV Lacertae. - Diagnostic possibilities of the Walrawen photometric system. - The flare activity of two peculiar red dwarfs. - Statistics of flares observed for UV Ceti type stars YZ CMi, AD Leo, and EV Lac at the Okayama Observatory. - Flare activity levels for fully convective red dwarfs. - Some physical consequences from the flare statistics of the UV Cet type stars in the solar neighbourhood. - Search for slow light variations of red-dwarf stars. - Distribution of red dwarfs in general galactic field on the basis of stellar star statistics. - New observations of flare stars in the Pleiades by the method of stellar tracks. - Possible new, bright flare star in the Pleiades region. - Data filtering in statistical studies of flares recorded in sky fields of stellar aggregates - demonstrated with the example of the Pleiades. - On two possible groups of flare stars in Pleiades. - Flare activity of stars in the Taurus region. - An automatic search for flare stars in southern stellar aggregates of different ages. - Spectral observations of flare stars. - NTT spectra of the flare stars HM1 and HM2 in the R Coronae Austrinae aggregate. - Catalog of flare stars in Orion nebula region. - A catalogue of flare stars in the Cygnus region. - Slow flares in stellar aggregates and solar vicinity. - A prediction of the flare activity of stellar aggregates. - Flare stars as age indicators in open clusters. - The relative number of flare stars in systems of different ages. - Flare stars at radio wavelengths (Invited paper). - Broadband spectral radio observations of flare stars. - Radio flare on eta Gemini star. - X-ray emission from solar neighbourhood flare stars. - Balmer and soft X-ray emission from solar and stellar flares. - X-ray variability in the Orion nebula. - II. Flare Stars and Related Objects. T Tauri Stars. - Some resolutions on T Tauri stars (Invited paper). - The variability of T Tauri stars. - Periodical variations of the brightness of T Tauri. - The polarization discovery and investigation of T Tau stars in Byurakan. - Recent results on polarization of T Tauri stars and other young stellar objects. - The UBVRI photometric and Polarimetric observations of the T Tau star HDE 283572. - Axial rotation of BY Dra-type stars and related objects. - Flares on T Tauri stars (Invited paper). - T Tauri stars and flare stars: common properties and differences. - Circumstellar phenomena and the position of T Tauri stars in the colour-magnitude diagram. - High resolution spectroscopy of RY Tauri: variability of the Na D line profiles. - Herbig-Haro phenomena associated with T Tauri: evidence for a precessing jet? - Survey observations of emission line stars and Herbig-Haro objects at the Kiso Observatory. - III. Flare Stars and Related Objects. Fuors and Other Non-Stable Objects. - FU Orionis eruptions and early stellar evolution (Invited paper). - Subfuors in Orion association. - Slow flares and eruptive phenomena in early stages of stellar evolution. - A new fuor? - Correlation between flare stars and other populations in young clusters and star forming regions. - The results of spectral observations of collimated outflows. - H2O megamaser in Orion KL. - Flares of radio line emission H2O in Ori A and W49N. - On the connection between the IRAS point sources and galactic nonstable objects. - The statistical analysis of the optical and infrared luminosities of young stars. - Far infrared emission from post-T Tauri stars. - Residual extinction effects in spectra of newly formed stars. - IV. Theoretical Problems and Interpretation of Observations. - Review of the theoretical models of flares of the UV Ceti-type stars (Invited review). - Quiescent chromospheric response to the (E)UV/optical flare radiation field on dMe stars. - The hydrogen atom kinetics in flare star chromospheres. - The Balmer decrement in red dwarfs spectra during the flares and quiescent state. - A model for the observed periodicity in the flaring rate on YY Gem. - Pinch-model of flares and its observational consequences. - On the gamma-activity of stellar flares. - On a differential equation for electromagnetic wave transmission in flare stars and the possible existance of cohesive wave solutions. - The stochastical approach to the modelling of the line profiles in T Tauri stellar winds. - On the origin of dwarf stars (Invited review). - Magnetic activity and evolution of low-mass young stars. - V. Prospects for Stellar Flare Research and Concluding Remarks. - Prospects for studies of UV Cet-type flare stars (Invited review). - Closing remarks. - Author index. - Object index.