The role of turbulent pressure as a coherent pulsational driving mechanism: The case of the δ SCUTI STAR HD 187547
Article
Article Title | The role of turbulent pressure as a coherent pulsational driving mechanism: The case of the δ SCUTI STAR HD 187547 |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Antoci, V. (Author), Cunha, M. (Author), Houdek, G. (Author), Kjeldsen, H. (Author), Trampedach, R. (Author), Handler, G. (Author), Luftinger, T. (Author), Arentoft, T. (Author) and Murphy, S. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 796 (2), pp. 1-8 |
Article Number | 118 |
Number of Pages | 8 |
Year | 2014 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0004-637X/796/2/118 |
Web Address (URL) | https://iopscience.iop.org/article/10.1088/0004-637X/796/2/118 |
Abstract | 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. |
Keywords | Asteroseismology; Convection; Stars: individual (HD 187546); Stars: oscillations; Stars: variables: delta Scuti |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | Aarhus University, Denmark |
University of Porto, Portugal | |
Nicolaus Copernicus Astronomical Center, Poland | |
University of Vienna, Austria | |
University of Sydney | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q736x/the-role-of-turbulent-pressure-as-a-coherent-pulsational-driving-mechanism-the-case-of-the-scuti-star-hd-187547
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