Journal
SCIENCE
Volume 350, Issue 6259, Pages 423-426Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aac6933
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Funding
- NSF [AST-1205732, PHY 11-25915, AST 11-09174]
- Lee DuBridge Fellowship at the California Instiute of Technology
- European Community [312844]
- Centre National d'Etudes Spatiales
- Australian Research Council
- NASA under Theory and Computational Astrophysics Network [NNX14AB53G]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1109174] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1205732] Funding Source: National Science Foundation
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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, arising 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 that field strengths larger than similar to 10(5) gauss may produce the observed depression, and in one case we infer a minimum core field strength of approximate to 10(7) gauss.
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