J. De Ridder
- Investigating the Properties of Granulation in the Red Giants Observed by Kepler
- Astronomical Society of the Pacific conference series
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Anton Pannekoek Institute for Astronomy (API)
More than 1000 red giants have been observed by NASA/Kepler mission during a nearly continuous period of ˜ 13 months. The resulting high-frequency resolution (< 0.03 μHz) allows us to study the granulation parameters of these stars. The granulation pattern results from the convection motions leading to upward flows of hot plasma and downward flows of cooler plasma. We fitted Harvey-like functions to the power spectra, to retrieve the timescale and amplitude of granulation. We show that there is an anti-correlation between both of these parameters and the position of maximum power of acoustic modes, while we also find a correlation with the radius, which agrees with the theory. We finally compare our results with 3D models of the convection.
Proceedings title: Progress in solar/stellar physics with helio- and asteroseismology: proceedings of a Fujihara Seminar held at Hakone, Japan, in 13-17 March 2011
Publisher: Astronomical Society of the Pacific
Place of publication: San Francisco
Editors: H. Shibahashi, M. Takata, A.E. Lynas-Gray
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