Even schoolchildren know that the vast majority of starsin the universe has a spherical shape. Refuting all the usual rules of physics, a star, called HD74423, recently discovered in 1500 light years from Earth, has a strange droplet or tear shape. The unusual star is part of a binary system with a red dwarf, which, researchers say, can be the very cause of the curved shape and unusual pulsations. How exactly does a small star affect its larger neighbor?
The strangest star in the universe
Pulsating stars are some of the most unusual.stars in the universe, which periodically increase and decrease in size, while changing their brightness for a relatively short period. Pulsing only in certain parts along strong magnetic fields, these stars for a long time remained one of the most mysterious stars in the Universe, the portal newsweek.com reports.
See also: A bright star near the Earth was clouded by cosmic dust
The most unusual star in the universe wasdiscovered with the TESS telescope - a recognized exoplanet hunter who has managed to find several hundred interesting objects outside the solar system. HD74423, whose mass is about 1.7 times the mass of our Sun, is part of a red dwarf binary system. These two stars rotate around each other every 1.6 days, which indicates the closest cosmic distance available between the stars. The gravitational attraction acting on each of the stars distorts them, causing the larger and hotter HD74423 to stretch in the shape of a drop.
The point of the star most susceptible to stretchingpulsates on the side that faces the satellite. In addition, Simon Murphy from the University of Sydney also noticed that the star HD74423 has some unusual physical properties. In particular, the density, pressure, and gravity indices of individual regions of the star are significantly different from similar indices of neighboring zones of a discovered unique object.
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Although the exact causes of very unusual behaviorstars still remain obscure today, several computer simulations have been carried out, which previously showed that the star pulsates along its tidal axis. According to researchers, this may mean that the pulsations can grow to even greater amplitudes, compared with those that were previously observed. Although the part of HD74423, which is opposite from its satellite, has stronger gravity, which allows the star to maintain its usual shape from at least one of the sides, pulsations can also be seen on it.
Although an unusual star mayseem truly unique in its kind, researchers believe that in the universe there are already analogues of the elongated drop-shaped HD74423. So, earlier TESS was able to detect a similar star with a metal shell, whose radiation of light lifts molten metals from the surface into the atmosphere.
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Although mankind has already managed severalto advance in the study of objects located from us in a relative cosmic neighborhood, the Universe certainly has even more amazing phenomena that we have yet to discover. However, those grains that we have already been able to find in the vastness of our universe can amaze even the most confident skeptic, which is once again proved by the star HD74423 and its small red satellite.