Dust Shells around WR 140 from Webb [apod.nasa.gov]
What are those strange rings?
Rich in dust, the rings are likely 3D shells — but * how * they were created remains a topic of research.
- Where * they were created is well known: in a binary star system that lies about 6,000 light years away toward the constellation of the Swan (Cygnus) — a system dominated by the Wolf-Rayet star WR 140.
Wolf-Rayet stars are massive, bright, and known for their tumultuous winds.
They are also known for creating and dispersing heavy elements such as carbon which is a building block of interstellar dust.
The other star in the binary is also bright and massive — but not as active.
The two great stars joust in an oblong orbit as they approach each other about every eight years.
When at closest approach, the X-ray emission from the system increases, as, apparently, does the dust expelled into space — creating another shell.
The featured infrared image by the new Webb Space Telescope resolves greater details and more dust shells than ever before.
