Study: white dwarfs stay unusually hot even as they get older

Previously, scientists believed that if you find out the temperature of a white dwarf and its cooling rate, you can approximately

determine his age.But the authors of the new work refuted this theory. To understand exactly how the temperature of white dwarfs changes and when thermonuclear reactions stop, the authors looked at white dwarfs from the large globular clusters M 3 and M 13.

The researchers used the Hubble Space Telescope to make new observations of white dwarfs M 3 and M 13 in the near ultraviolet range and compare them.

As a result, it turned out that, unlike morecold dwarfs in M ​​3, some stars in M ​​13 have retained their hydrogen shells, in which slow thermonuclear reactions can take place. Therefore, the temperature of M 13 stars is much higher than previously thought.

As a result of computer simulationIt turned out that due to such processes, about 70% of white dwarfs in M ​​13 cool more slowly than expected. Based on the results of the work, the authors found that the temperature of white dwarfs is not as directly related to age as is commonly thought.

Now this scheme will have to be adjusted, since white dwarfs may look younger than they appear, and this discrepancy can be up to a billion years. 

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