Methodological Aspects of Delta Scuti Star Seismology

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stars: Variable, Oscillations, Delta Scuti Type, Asteroseismology

Scientific paper

I present a personally biased view of the present status of seismology of delta Scuti stars. While much thought has been given to develop new tools for mode identification, the required cross-calibrations between them are difficult. I suggest to pay more attention to target selection, since the objects which have the best chances to be successfully modeled -- unevolved, slowly rotating delta Scuti stars -- are poorly observed. In the light of an upcoming large multi-site campaign on the only well investigated representative of this class, WET 0856 = CD-24 7599 = XX Pyx, I estimate the size of some spurious results which can affect data analysis, in particular those caused by passband mismatches of inhomogeneous equipment used in worldwide observing campaigns. I find that they hardly influence the results for delta Scuti and roAp stars, but they can become dangerous for high-amplitude DA pulsators.

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