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Theoretical understanding of radial-velocity pulsations observed in roAp stars

J. Sousa, M. S. Cunha

High-resolution spectroscopic time-series of rapidly oscillating Ap stars show evidence that standing and running waves can co-exist in their atmospheric layers. In order to understand these observations we have carried out a theoretical analysis of the pulsations in the outermost layers of these stars. By using the analytical solutions for the velocity components appropriate to the model considered we derive an estimate of the velocity component parallel to the line of sight averaged over the visible stellar disk, and derive the relative amplitude and the phase for our model as a function of height in the atmosphere.

Contributions of the Astronomical Observatory Skalnaté Pleso
Volume 38, Page 453
2008 August

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia