Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..948..249k&link_type=abstract
UNSOLVED PROBLEMS IN STELLAR PHYSICS: A Conference in Honor of Douglas Gough. AIP Conference Proceedings, Volume 948, pp. 249-2
Physics
Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation, Pulsations, Oscillations, And Stellar Seismology, Abundances, Chemical Composition, Main-Sequence: Intermediate-Type Stars
Scientific paper
We have obtained a large amount of data on over 40 roAp stars and potential roAp stars with the Ultraviolet and Visual Echelle Spectrograph (UVES) on the VLT with time resolution typically around 1 min and radial velocity precision as high as 1 m s-1. Abundance stratification caused by atomic diffusion in the presence of strong global magnetic fields gives promise of three-dimensional maps of the pulsation amplitude and phase, and of the abundance distributions of many ions that may provide the strongest observational tests of atomic diffusion theory. Studies of individual spectral lines and of line profile variability sample the observable atmospheres of roAp stars from continuum optical depth τ5000~1 to as high as τ5000~10-5, revealing fascinating new pulsational behaviour not observed in other types of pulsating stars, including, inter alia, line profile variability in rare earth elements lines interpreted by as evidence for shock waves in the high atmosphere of these stars, an intriguing range of line bisector shapes, and a new pulsational diagnostic for resolved Zeeman components for the most strongly magnetic stars.
Elkin V. G.
Freyhammer Lars Michael
Kurtz Don W.
Mathys Gautier
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