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Giant bubbles on red giant star's surface

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Owlscrying
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Unread post Fri Dec 22, 2017 9:40 pm

Astronomers using ESO's Very Large Telescope have for the first time directly observed granulation patterns on the surface of a star outside the solar system—the aging red giant π1 Gruis. This remarkable new image from the PIONIER instrument reveals the convective cells that make up the surface of this huge star, which has 700 times the diameter of the sun. Each cell covers more than a quarter of the star's diameter and measures about 120 million kilometers across.

Located 530 light-years from Earth in the constellation of Grus (The Crane), π1 Gruis is a cool red giant. It has about the same mass as our Sun, but is 700 times larger and several thousand times as bright. Our Sun will swell to become a similar red giant star in about five billion years.

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Owlscrying
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Unread post Fri Dec 22, 2017 9:42 pm

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Credit: ESO

Astronomers using ESO's Very Large Telescope have directly observed granulation patterns on the surface of a star outside the Solar System -- the ageing red giant π1 Gruis. This remarkable new image from the PIONIER instrument reveals the convective cells that make up the surface of this huge star. Each cell covers more than a quarter of the star's diameter and measures about 120 million kilometres across.

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Owlscrying
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Unread post Fri Dec 22, 2017 9:43 pm



Astronomers using ESO’s Very Large Telescope have for the first time directly observed granulation patterns on the surface of a star outside the Solar System — the ageing red giant π1 Gruis.

 

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Owlscrying
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Unread post Fri Dec 22, 2017 9:44 pm



This sequence takes the viewer towards the southern constellation of Grus (The Crane). We zoom in on the pair of stars π1 Gruis (red) and π2 Gruis (bluish-white), and the bright spiral galaxy IC 5201 is also visible. The final shot shows a very detailed view of the surface of the red giant star π1 Gruis from the PIONIER instrument on the VLT Interferometer.


 

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