One of the brightest stars we see in the night sky has lost its outer layers of gas and now it is just a rare, stripped-back core
Gamma Columbae looks like a normal star to the naked eye, but it has been stripped of its outer layers of gasOne of the Milky Way’s brightest stars visible with the naked eye, Gamma Columbae, is actually a stripped-back stellar core.
at the University of Innsbruck in Austria and his colleagues have used spectroscopy to analyse the elements in Gamma Columbae, which has a mass about five times that of our sun. They realised that the signature, which was lacking in carbon and rich in nitrogen, only made sense if what they were seeing was the surface of a recently extinguished core.“It exposes, on the surface, the chemical signature of a stellar core,” says Przybilla.
Further observations of Gamma Columbae should help us better understand how stars evolve once they have exhausted their supply of hydrogen for fusion, as well as how Gamma Columbae might have been stripped back. The team thinks it could be from a companion star removing its outer layers, but it isn’t certain.
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