Wolf-Rayet stars are notable for their unusual emission lines, first explained after the discovery of helium in 1868. These stars, which eject gas at high velocities, are central to planetary nebulae. This week, a photograph of WR 134, a variable Wolf-Rayet star approximately 6,000 light-years away in the constellation Cygnus, was shared by an astronomer. The image showcases the blue shell of ionized oxygen gas resulting from stellar winds, which highlights the beauty and wonder of the universe.
In the 1800s, astronomers were mystified by the discovery of stars that displayed highly unusual emission lines. It was only after 1868, when scientists discovered the element helium, that astronomers were able to explain the broad emission bands due to the presence of helium in these stars.
Over time, these stars became known as Wolf-Rayet stars... Astronomers came to understand that they were the central stars within planetary nebulae, and continually ejecting gas at high velocity.
This week, Chris McGrew has shared a photo of WR 134—a variable Wolf-Rayet star about 6,000 light-years away from Earth in the constellation of Cygnus.
The stellar winds are blowing out the blue shell of ionized oxygen gas visible in the middle of the image... Ever since I saw it for the first time, it's been high on my list.
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