Skip to Main content Skip to Navigation
Journal articles

Asteroseismology can reveal strong internal magnetic fields in red giant stars

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, 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 ~105 gauss may produce the observed depression, and in one case we infer a minimum core field strength of ≈107 gauss.
Document type :
Journal articles
Complete list of metadatas

https://hal-cea.archives-ouvertes.fr/cea-01820446
Contributor : Marianne Leriche <>
Submitted on : Thursday, June 21, 2018 - 4:21:36 PM
Last modification on : Friday, April 10, 2020 - 5:20:00 PM

Links full text

Identifiers

Citation

J. Fuller, M. Cantiello, D. Stello, R. Garcia, L. Bildsten. Asteroseismology can reveal strong internal magnetic fields in red giant stars. Science, American Association for the Advancement of Science, 2015, 350 (6259), pp.423 - 426. ⟨10.1126/science.aac6933⟩. ⟨cea-01820446⟩

Share

Metrics

Record views

374