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Astronomers capture stellar winds in unprecedented detail 5nvklj





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Astronomers capture stellar winds in unprecedented detail

Dragon
Dragon
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Astronomers capture stellar winds in unprecedented detail Empty Astronomers capture stellar winds in unprecedented detail

Post by Dragon Sat Sep 19, 2020 3:31 am

Astronomers have presented an explanation for the shapes of planetary nebulae. The discovery is based on a set of observations of stellar winds around aging stars. Contrary to common consensus, the team found that stellar winds are not spherical, but have a shape similar to that of planetary nebulae.

Dying stars swell and cool to eventually become red giants. They produce stellar winds, flows of particles that the star expels, which causes them to lose mass. Because detailed observations were lacking, astronomers have always assumed that these winds were spherical, like the stars they surround.

As the star evolves further, it heats up again and the stellar radiation causes the expanding ejected layers of stellar material to glow, forming a planetary nebula.

Continued...
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Astronomers capture stellar winds in unprecedented detail 334pu7m
Dragon
Dragon
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Posts : 7244
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Post by Dragon Sat Sep 19, 2020 3:33 am

Astronomers capture stellar winds in unprecedented detail 13-astronomersc
Credit: L. Decin, ESO/ALMA

The stellar wind of R Aquilae resembles the structure of rose petals.

Source / Image Courtesy


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Astronomers capture stellar winds in unprecedented detail 334pu7m
Dragon
Dragon
Senior Administrator
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Posts : 7244
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Times User Thanked: : 899
Join date : 2018-01-18

Astronomers capture stellar winds in unprecedented detail Empty Re: Astronomers capture stellar winds in unprecedented detail

Post by Dragon Sat Sep 19, 2020 3:34 am

Astronomers capture stellar winds in unprecedented detail 12-astronomersc
Credit: L. Decin, ESO/ALMA

This image gallery of stellar winds around cool ageing stars shows a variety of morphologies, including disks, cones, and spirals.

The blue colour represents material that is coming towards you; red is material that is moving away from you.

Source / Image Courtesy


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Astronomers capture stellar winds in unprecedented detail 334pu7m
Dragon
Dragon
Senior Administrator
Senior Administrator

Posts : 7244
Points : 23811
Times User Thanked: : 899
Join date : 2018-01-18

Astronomers capture stellar winds in unprecedented detail Empty Re: Astronomers capture stellar winds in unprecedented detail

Post by Dragon Sat Sep 19, 2020 3:36 am



Superstar Eta Carinae Shoots Cosmic Rays


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Astronomers capture stellar winds in unprecedented detail 334pu7m

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