CoRoT measures solar-like oscillations and granulation in stars hotter than the Sun

Details CoRoT measures solar-like oscillations and granulation in stars hotter than the Sun CoRoT measures solar-like oscillations and granulation in stars hotter than the Sun

2008-12-06

arxiv.org/abs/0812.1267v1

Science 322:558-560,2008

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures

Scientific paper

10.1126/scien=

Oscillations of the Sun have been used to understand its interior structure. The extension of similar studies to more distant stars has raised many difficulties despite the strong efforts of the international community over the past decades. The CoRoT (Convection Rotation and Planetary Transits) satellite, launched in December 2006, has now measured oscillations and the stellar granulation signature in three main sequence stars that are noticeably hotter than the sun. The oscillation amplitudes are about 1.5 times as large as those in the Sun; the stellar granulation is up to three times as high. The stellar amplitudes are about 25% below the theoretic values, providing a measurement of the nonadiabaticity of the process ruling the oscillations in the outer layers of the stars.

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