Asteroseismology can reveal strong internal magnetic fields in red giant stars

DOI10.1126/SCIENCE.AAC6933zbMATH Open1355.85006arXiv1510.06960OpenAlexW3098742043WikidataQ34499177 ScholiaQ34499177MaRDI QIDQ2961931

Jim Fuller, Rafael Garcia, Lars Bildsten, Dennis Stello, Matteo Cantiello

Publication date: 15 February 2017

Published in: Science (Search for Journal in Brave)

Abstract: Internal stellar magnetic fields are inaccessible to direct observations and little is known about their amplitude, geometry and evolution. We demonstrate that strong magnetic fields in the cores of red giant stars can be identified with asteroseismology. The fields can manifest themselves via depressed dipole stellar oscillation modes, which arises from a magnetic greenhouse effect that scatters and traps oscillation mode energy within the core of the star. The Kepler satellite has observed a few dozen red giants with depressed dipole modes which we interpret as stars with strongly magnetized cores. We find field strengths larger than $sim!10^5,mG$ may produce the observed depression, and in one case we infer a minimum core field strength of $approx!!10^7,mG$.

Full work available at URL: https://arxiv.org/abs/1510.06960

Mathematics Subject Classification ID

Galactic and stellar structure (85A15)

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