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Surface convection : from the Sun to red giant stars

By Laurent Piau, P. Kervella, S. Dib and P. Hauschildt

Abstract

International audienceWe check how the change in surface conditions between the Sun and red giant branch stars,changes the characteristic surface convection length scale to be used in models. We investigate the question in the case of the mixing length theory and of the phenomenology of full spectrum of turbulence. For the observational part, we rely on independent measurements of e ective temperatures and interferometric radii of nearby red giants. We nd that the local red giant branch cannot be explained taking into account the solar calibrated convective length scale

Topics: Surface convection, Sun, Red giant stars, Interferometry, [ SDU.ASTR.SR ] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [ PHYS.ASTR.SR ] Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR]
Publisher: Société Française d'Astronomie & d'Astrophysique (SF2A)
Year: 2011
OAI identifier: oai:HAL:hal-00647826v1
Provided by: Hal-Diderot
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