Radial Pulsations in A Stars: the Effects of Opacity Fluctuations in their Atmospheres

Details Radial Pulsations in A Stars: the Effects of Opacity Fluctuations in their Atmospheres Radial Pulsations in A Stars: the Effects of Opacity Fluctuations in their Atmospheres

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1170..506m&link_type=abstract

STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP Conference Proceedin

Computer Science

Radiative Transfer, Scattering, Pulsations, Oscillations, And Stellar Seismology, Photometric, Polarimetric, And Spectroscopic Instrumentation

Scientific paper

We investigate the effect of pulsational opacity fluctuations in the atmospheres of A star models and show that the opacity fluctuations are responsible for the ``bump'' often seen in the temperature eigenfunctions in the region of the hydrogen ionization zone. We also present a formula that relates perturbations in the surface flux to those in effective temperature (Teff). This formula shows that for cooler A stars, opacity fluctuations can introduce a phase difference between δH(0)/H(0) and δTeff/Teff. In addition the new formula is used to calculate multicolour pulsational amplitudes that can be compared with photometric data to perform mode discrimination.

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