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Toward 3-D pulsation maps of roAp stars

Published online by Cambridge University Press:  13 January 2006

G. Alecian ,
O. Richard ,
S. Vauclair  and
O. Kochukhov
O. Kochukhov*
Affiliation:
Department of Astronomy and Space Physics, Uppsala University, Box 515, 751 20 Uppsala, Sweden
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Abstract


Time-resolved spectroscopic observations of non-radial oscillations in magnetic Apstars reveal unexpected and complex pulsation behaviour in spectral linesof individual chemical elements. This diverse rapid spectroscopic variability isclosely related to the presence of strong photospheric vertical abundance gradientsbuilt up by chemical diffusion. Consideration of chemical stratification and simultaneous interpretation of the pulsationalvariability of different chemical species have made it possible a tomographicmapping of the radial dependence of pulsationproperties of the atmospheres of roAp stars. Combination of the informationobtained using pulsation tomography with horizontal mapping using Doppler imagingopens a unique possibility to construct unprecedented three-dimensional maps of pulsationwaves, chemical spots and magnetic field in the atmospheres of peculiar A stars.


Type
Research Article
Information
European Astronomical Society Publications Series , Volume 17: Element Stratification in Stars: 40 Years of Atomic Diffusion , 2005 , pp. 103 - 112
Copyright
© EAS, EDP Sciences, 2005

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