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Americans simulated explosion of a star

28 Nov

starComputer modeling has enabled scientists to clarify the processes occurring during the explosion of supernovae of type Ia. Researchers reported their findings at the American Physical Society in Baltimore, and a summary of the report is available on the website of society.
According to the most popular hypothesis at the moment, the explosion of Type Ia supernovae occur in binary systems in which the white dwarf stealing matter from the star-neighbor reaches a critical mass (the Chandrasekhar limit) and explodes. But exactly how the explosion takes place, the physics are still arguing.
According to one theory in the envelope of the dwarf there are processes similar to the sudden transition from a relatively quiet deflagration combustion to detonation in gaseous mixtures (with the only difference being that in the outer layers of the dwarf is in the process of thermonuclear fusion). This process is known as DDT.
In the new work, scientists simulated this transition on the computer. In their calculations, they relied on the idea that a key role in this transition is turbulence. Researchers were able to get enough of a realistic picture of the development process. Moreover, they note that as far as the data correspond to reality, can be determined only by comparing the predictions of their model with data of real observations of supernovae.
Type Ia supernovae are used in astronomy for the construction of the so-called distance scale, so the scientists just need to understand the process in detail. In early October 2011 in the journal Monthly Notices of the Royal Astronomical Society published an article in which it was proved that at least the majority of type Ia supernovae produced by the collision of white dwarfs in binary systems

 
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Posted by on November 28, 2011 in Galaxy

 

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