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Stellar granulation and interferometry

Published online by Cambridge University Press:  10 September 2015

A. Chiavassa
Affiliation:
Laboratoire Lagrange, UMR 7293, CNRS, Observatoire de la Côte d*Azur, Université de Nice Sophia-Antipolis, Nice, France
L. Bigot
Affiliation:
Laboratoire Lagrange, UMR 7293, CNRS, Observatoire de la Côte d*Azur, Université de Nice Sophia-Antipolis, Nice, France
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Abstract

Stars are not smooth. Their photosphere is covered by a granulation pattern associated with the heat transport by convection. The convection-related surface structures have different size, depth, and temporal variations with respect to the stellar type. The related activity (in addition to other phenomena such as magnetic spots, rotation, dust, etc.) potentially causes bias in stellar parameters determination, radial velocity, chemical abundances determinations, and exoplanet transit detections.

The role of long-baseline interferometric observations in this astrophysical context is crucial to characterize the stellar surface dynamics and correct the potential biases. In this Chapter, we present how the granulation pattern is expected for different kind of stellar types ranging from main sequence to extremely evolved stars of different masses and how interferometric techniques help to study their photospheric dynamics.

Type
Research Article
Copyright
© EAS, EDP Sciences, 2015

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