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Post Info TOPIC: Stellar seismology
Blobrana


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Title: CoRoT measures solar-like oscillations and granulation in stars hotter than the Sun
Authors: E. Michel, A. Baglin, M. Auvergne, C. Catala, R. Samadi, et al

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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Blobrana


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Wiggles in the brightness of stars other than the Sun have been measured in detail for the first time. The technique could soon be used to probe stars' innards the way seismologists use sound to image Earth's interior and develop better estimates of stellar ages.

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Blobrana


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Courbes de lumière des 3 étoiles observées par CoRoT. Crédits : LESIA.
Courbes de lumière des 3 étoiles observées par CoRoT. Crédits : LESIA.

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Blobrana


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Sounding the Sun through a technique similar to seismology has opened a new era for understanding the Suns interior. The COROT satellite has now applied this technique to three stars, directly probing the interiors of stars beyond the Sun for the first time.
When global oscillations of the Sun were discovered, scientists realised they opened a window to the Suns interior. Like the propagation of seismic waves on Earth providing information about our planets interior, sound waves travel throughout the Sun carrying information about what is happening below the surface.

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Blobrana


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Scientists have recorded the sound of three stars similar to our Sun using France's Corot space telescope.
A team writing in Science journal says the sounds have enabled them to get information about processes deep within stars for the first time. If you listen closely to the sounds of each star you'll hear a regular repeating pattern.

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