This article shows how some recent developments in the observation and theoretical modeling of weak polarization signals in chromospheric spectral lines are...
Chromospheric modelling in late-type dwarfs. I - Quiescent objects
Attention is given to problems which arise when an attempt is made to use observational material to clarify the mechanisms responsible for the heating of the...
Chromospheric modelling in late-type dwarfs. II - CES observations of active and quiescent stars
The characteristics of the chromospheres of late-type dwarf stars were studied using the CoudeEchelle Spectrograph (CES) at ESO and the IUE. The study focused...
Chromospheric resonant cavities in umbrae: unequivocal detection and seismic applications
Umbral chromospheric oscillations exhibit significant differences compared to their photospheric counterparts. We evaluate two competing scenarios proposed for...
Chromospheric variability in late-type dwarfs from high-resolution spectra of CA II H
An analysis is presented of high-resolution high SNR spectra of late-type chromospherically active dwarfs in Ca II H. Observational parameters employed are the...
Chromospheric Velocity Fields Diagnostics from CAII and MGII Emission Profiles
The authors discuss the present limits to the velocity field diagnostics in stellar chromospheres achievable with ESO CAT+CES and IUE high resolution spectra.
CI Cam: Observations of the Dust Envelope Diameter
We spatially resolved the symbiotic star CI Cam, about 6 months after its April 1998 outburst, using the IOTA stellar interferometer. We measured the diameter...