Determining temperature amplitude as a function of depth in the atmospheres of rapidly oscillating Ap stars |
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| Authors: | R Medupe & D W Kurtz |
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| Institution: | Astronomy Department, University of Cape Town, Rondebosch 7700, South Africa,;Institute of Physics and Astronomy, Aarhus University, Building 520, Ny Munkegade, DK-8000 Aarhus C, Denmark |
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| Abstract: | We present numerical models based on realistic treatment of the intensity spectrum (from model atmospheres), and demonstrate that they are consistent with Kurtz and Medupe's recent formula in showing that limb darkening is too small an effect to explain the observed sharp decline of pulsation light amplitude with wavelength in rapidly oscillating Ap stars. Kurtz and Medupe's formula is shown to be a special form of Watson's earlier general formula for non-radial light variations of a star pulsating in any mode ( l m ). Using a technique suggested by Kurtz and Medupe we derive temperature semi-amplitude as a function of depth in the atmospheres of α Cir and HR 3831, assuming that we can neglect non-adiabatic effects. |
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| Keywords: | stars: chemically peculiar stars: individual: HR 3831 stars: individual: α Cir stars: oscillations stars: variables: other |
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