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Empirical relations for the sensitivities of solar-like oscillations to magnetic perturbations
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Kiefer, René and Broomhall, Anne-Marie (2020) Empirical relations for the sensitivities of solar-like oscillations to magnetic perturbations. Monthly Notices of the Royal Astronomical Society, 496 (4). pp. 4593-4605. doi:10.1093/mnras/staa1807
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Official URL: http://doi.org/10.1093/mnras/staa1807
Abstract
Oscillation mode frequencies of stars are typically treated as static for a given stellar model. However, in reality they can be perturbed by time varying sources such as magnetic fields and flows. We calculate the sensitivities of radial p-mode oscillations of a set of models for masses between 0.7–3.0M⊙ from the main sequence to the early asymptotic giant branch. We fit these mode sensitivities with polynomials in fundamental stellar parameters for six stages of stellar evolution. We find that the bestfitting relations differ from thos proposed in the literature and change between stages of stellar evolution. Together with a measure of the strength of the perturbation, e.g., of the level of magnetic activity, the presented relations can be used for assessing whether a star’s observed oscillation frequencies are likely to be close to the unperturbed ground
state or whether they should be adjusted.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||
| Divisions: | Faculty of Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Astroseismology, Stellar oscillations -- Mathematical models, Stars -- Magnetic fields | |||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||
| Publisher: | Oxford University Press | |||||||||
| ISSN: | 1745-3933 | |||||||||
| Official Date: | August 2020 | |||||||||
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| Volume: | 496 | |||||||||
| Number: | 4 | |||||||||
| Page Range: | pp. 4593-4605 | |||||||||
| DOI: | 10.1093/mnras/staa1807 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access | |||||||||
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