"The star - said Hollands - stood out immediately as something that we had never seen before. You may expect to see an outer layer of hydrogen, sometimes mixed with helium, or just a mixture of helium and carbon. Don't expect to see this combination of hydrogen and carbon".
According to the researcher, the composition and the mass, double the average for a white dwarf can be explained through the normal stellar evolution. The only way to explain them is that the star has formed "through the fusion of two white dwarfs". Also the collision between the two celestial objects was particularly unusual: most of the fusion events between two stars can occur between mass stars different, but in this case it seems that the merger has occurred between two white dwarfs of similar mass.
Difficult to establish the age of the star: because the mechanism of fusion, restart the cooling process of the star, it is difficult to determine how old it is. However, astronomers speculate that the merger between the two stars could be occurred by 1.3 billion years ago, but the two white dwarfs original have already existed for several billion years.
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