Astronomers have discovered a new type of nebula that envelops a binary pair of stars. And they couldn't have done it without the help of amateurs.
Most Universe Today readers are familiar with nebulae. They’re gaseous structures lit up with radiation from nearby stars, and they’re some of nature’s most beautiful forms.
In a press release, Kimeswenger said, “Toward the end of their lives, normal stars inflate into red giant stars. Since a very large fraction of stars is in binary pairs, this affects the evolution at the end of their lives. In close binary systems, the inflating outer part of a star merges as a common envelope around both stars. However, inside this gas envelope, the cores of the two stars are practically undisturbed and follow their evolution like independent single stars.
The envelope is vast, over 15 light-years across. At that size, astronomers expect that the envelope would be distorted and disrupted by other stars. But YY Hya is above the galactic plane and undisturbed by other gas clouds. These are H-alpha images of the central portion of the nebula with YY Hya dotted pink in the center. The image on the right has other stars removed. The tip of the southwestern lobe of the nebula is visible on the right of the images. Image Credit: Kimeswenger et al 2021.
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