Influence of helium ionisation on red giant oscillation spectra
LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195 Meudon cedex, France
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Published online: 23 September 2015
Since its launch in 2009, the space mission Kepler has provided an amount of data of unprecedented quality. In particular, red giants exhibit an oscillation spectrum arranged in a regular pattern called the universal oscillation pattern. Here we analyse and characterize the departures observed from this universal pattern. We measured the deviation for more than one hundred red giants and attribute it to glitches related to the region of second ionisation of helium.
© Owned by the authors, published by EDP Sciences, 2015
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