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“Cold” neutron stars discovered by astronomers in Spain

“Cold” neutron stars discovered by astronomers in Spain

“In theory, his temperature is very high, but it is unusually cold for his young age,” Alessio Marino, co-author of the study and a member of the Barcelona Institute of Space Sciences, told AFP.

Normally, a star is born “at a temperature of approximately 500 billion degrees, and in just a few minutes, its temperature drops below 10 billion degrees,” explained Michaela Ortel, research director at the National Center for Scientific Research at the Strasbourg Observatory who specializes in these compact objects. To Agence France-Presse.

Its temperature drops dramatically with age, after a million years.

In this case, astronomers calculate cooling curves by age, allowing them to be compared to neutron stars. They determine the age by looking at the cloud left over from the original explosion that gave rise to the stars.

According to their calculations, the youngest, J0205, is 841 years old. The other two are 7,700 years old and 2,500 to 5,000 years old, respectively, with temperatures ranging from 1.9 to 4.6 million degrees Celsius. At least twice the size of contemporary neutron stars.

Despite this, “the cooling of a star is really sensitive to its internal composition,” especially the ratio of neutrons to protons, says Michaela Ortel, who was not involved in the study.

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