These Bizarre Concentric Rings in Space are Real, Not an Optical Illusion. New Data from JWST Explains What’s Happening By Nancy_A
The exotic, odd-couple stars in WR-140 consist of an O-type star roughly 30 times the mass of the Sun and a Wolf-Rayet companion about 10 times the mass of the Sun, located just over 5,000 light-years from Earth. While other Wolf-Rayet systems form dust, none is known to make the nested dust shells like Wolf-Rayet 140 does.
“The earlier ground-based observations detected only a couple of inner shells and related features,” Morris said via email. “They interpreted them as dust formed during the last two periastron passages of the massive O star and the more evolved carbon-rich Wolf-Rayet star.” Animation showing how the WR 140 binary produces dust at periastron. Credit: NASA, ESA, Joseph Olmsted/STScIThe new JWST observations, led by Ryan Lau, an astronomer at the National Science Foundation’s NOIRLab, reveals the unique ring pattern forms because the eccentric orbit of the stars in WR 140 is elongated, not circular. Only when the stars come close together every 7.
The two stars in Wolf-Rayet 140 produce shells of dust every eight years that look like rings, as seen in this image from NASA’s James Webb Space Telescope. Each ring was created when the stars came close together and their stellar winds collided. Credit: NASA/ESA/CSA/STScl/JPL-Caltech
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