An "unusual star" has been found that is radically different


Space is a place that constantly presents scientists with new surprises and surprises. Such surprises can be safely attributed to the IRA 00500+6713 system discovered in 2019, whose star did not form in the traditional way, but arose as a result of a destructive event - the collision of two white dwarf stars. Such a collision and subsequent unification of two dwarf stars are usually accompanied by a powerful and bright supernova explosion, which scientists refer to as a class 1a. But in the case of the IRA 00500+6713 system, the explosion was not powerful enough to completely destroy everything in the nearby surrounding space, because of this, an astronomical object of a type previously unknown to scientists was formed at the site of the explosion.



The unusual nature of the IRA 00500+6713 object immediately attracted the attention of scientists. The object consists of a super-hot Central star, J005311, surrounded by a nebula of hot (several million degrees) cosmic gas and warm dust. In the composition of the star, there is a fairly large amount of oxygen and carbon, and the speed of the stellar wind produced by this star starts at 16 thousand kilometers per second. Scientists noted that no one had ever seen an object similar to the IRA 00500+6713 system before, and this statement was confirmed by observations in the infrared range, in which the star J005311 shone too brightly to be confused with a dwarf star.


After that, scientists conducted observations of the IRA 00500+6713 system in the x-ray range using the XMM-Newton space telescope. The characteristic spectral lines in the x-ray immediately indicated the presence of a large amount of another element in the system - neon. Also, in smaller amounts, the presence of silicon and sulfur was recorded.


Mathematical simulations indicate that IRA 00500+6713 is the result of a collision between two white dwarf stars. The heavier dwarf star gradually "pumped" matter into itself from the lighter companion, which subsequently caused a supernova explosion, weak enough to completely destroy the system. Nevertheless, the power of this explosion was enough to scatter a sufficiently large amount of matter across space, which led to the formation of a nebula. And the star itself after the explosion turned into an "unusual star", the mass of which is 1.4 times the mass of the Sun, which is the theoretical upper limit of mass for white dwarf stars (dwarf stars with a larger mass after the explosion usually collapse into a black hole or explode, leaving behind a neutron star).


Scientists suspect that objects like IRA 00500+6713 should occur in space quite often. But they have long and successfully evaded detection by astronomers due to the high speed of processes and the short period of their existence. Indeed, according to calculations, the star J005311 will turn into a neutron star in approximately one thousand years, which will be accompanied by another supernova explosion.



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