EAS Publications Series
Volume 17, 2005Element Stratification in Stars: 40 Years of Atomic Diffusion
|Page(s)||103 - 112|
|Published online||13 January 2006|
G. Alecian, O. Richard and S. Vauclair (eds)
EAS Publications Series, 17 (2005) 103-112
Toward 3-D pulsation maps of roAp stars
Department of Astronomy and Space Physics, Uppsala University,
Box 515, 751 20 Uppsala, Sweden
Time-resolved spectroscopic observations of non-radial oscillations in magnetic Ap stars reveal unexpected and complex pulsation behaviour in spectral lines of individual chemical elements. This diverse rapid spectroscopic variability is closely related to the presence of strong photospheric vertical abundance gradients built up by chemical diffusion. Consideration of chemical stratification and simultaneous interpretation of the pulsational variability of different chemical species have made it possible a tomographic mapping of the radial dependence of pulsation properties of the atmospheres of roAp stars. Combination of the information obtained using pulsation tomography with horizontal mapping using Doppler imaging opens a unique possibility to construct unprecedented three-dimensional maps of pulsation waves, chemical spots and magnetic field in the atmospheres of peculiar A stars.
© EAS, EDP Sciences, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.