Flowers of stellar wind

The ongoing large-scale ATOMIUM project is being conducted in collaboration with ALMA, the Atacama Large  Millimeter/submillimeter Array, which is located in Chile and has ESO as a partner.The project set out to map the stellar winds blowing out from around a dozen red giant stars, an ambitious goal made possible thanks to ALMA’s spectacular resolution. These stellar winds — which are sometimes millions of times stronger than those of our Sun — were expected to be spherical, like the parent stars that they are blasted away from. 

However, researchers did not observe spherical stellar winds, but something quite different. As seen in the above image — which shows winds around a star called R Aquilae — the team found that in all cases the stellar winds were not spherical, but had different shapes, including some resembling the delicate petals of a rose. The patterns seen in the stellar winds have a striking resemblance to those of planetary nebulae. 

The research team, led by Leen Decin at KULeuven, Belgium, proposed that a process known as binary interaction is responsible for the shape of the stellar winds of red giant stars. As the name suggests, binary interaction involves two objects. The theory is that the stellar winds achieve their shape due to the influence of another star, or a giant planet. Stellar winds are the precursors to planetary nebulae, and the apparent similarity in their structures indicates that the physics that shapes stellar winds also shapes planetary nebulae, and hence that binary interaction is the key agent carving out the planetary nebulae morphologies.

Credit:

ALMA (ESO/NAOJ/NRAO), Decin et al.

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