Thorne Żytkow object

Thorne–Żytkow object:-

A Thorne–Żytkow object is a conjectured type of star wherein a red giant or supergiant contains a neutron star at its core, formed from the collision of the giant with the neutron star. Though we don't know exactly how a TZO comes to be, the prevailing theory is that a red supergiant star essentially swallows a tiny neutron star, which spirals into the center of the larger star and makes a home in its core. Since they can't identify a TZO by looking, scientists use their knowledge of the elements within it to detect them in its unique light spectrum.

Stars are basically element factories: their cores fuse hydrogen atoms into helium, helium into beryllium, and so on down the periodic table until they get to iron. Once a star massive enough to fuse iron has done so, its core caves in on itself until it's as dense as an atomic nucleus, then the entire thing explodes in a giant supernova. That's how a TZO's neutron-star core is created: it's the super-dense body that's left after a star has blown off its outer layers.

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