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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The role of turbulent pressure as a coherent pulsational driving mechanism: The case of the δ SCUTI STAR HD 187547
Astrophysical Journal, Volume 796, No. 2, Article 118, Year 2014
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Description
HD 187547 was the first candidate that led to the suggestion that solar-like oscillations are present in δ Scuti stars. Longer observations, however, show that the modes interpreted as solar-like oscillations have either very long mode lifetimes, longer than 960 days, or are coherent. These results are incompatible with the nature of "pure" stochastic excitation as observed in solar-like stars. Nonetheless, one point is certain: the opacity mechanism alone cannot explain the oscillation spectrum of HD 187547. Here we present new theoretical investigations showing that convection dynamics can intrinsically excite coherent pulsations in the chemically peculiar δ Scuti star HD 187547. More precisely, it is the perturbations of the mean Reynold stresses (turbulent pressure) that drives the pulsations and the excitation takes place predominantly in the hydrogen ionization zone. © 2014. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Antoci, Victoria L.
Denmark, Aarhus
Aarhus Universitet
Cunha, Margarida S.
Portugal, Porto
Universidade do Porto
Houdek, Gueuler
Denmark, Aarhus
Aarhus Universitet
Kjeldsen, Henrik
Denmark, Aarhus
Aarhus Universitet
Handler, Gerald
Poland, Warsaw
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences
Lüftinger, Theresa
Austria, Vienna
Universität Wien
Arentoft, Torben
Denmark, Aarhus
Aarhus Universitet
Murphy, Simon J.
Australia, Sydney
The University of Sydney
Statistics
Citations: 62
Authors: 8
Affiliations: 6
Identifiers
Doi:
10.1088/0004-637X/796/2/118
ISSN:
0004637X