A researcher at the UNAM ensures that in matter inside do not have viscosity or friction
Of this type of stars escaping the neutrinos, elementary particles with no electric charge, whose mass is so small that it no yet could be measured (Foto: Tomada UNAM )
Neutron stars are small, dense, high-energy and matter inside them is superfluid and no viscosity or friction, said Dany Page, a researcher at the Institute of Astronomy (IA) of the UNAM.
These stars are born when a massive star dies and have a mass greater than twice that of the Sun, but are the size of a city, such as 20 kilometers in diameter.
"A normal star is mainly formed with hydrogen and helium, and during his life transforms these into heavier and heavier elements. Those who have a mass greater than about 10 times the Sun, reach to produce iron at its core, which grows again, and there comes a time when the gravity that produces this dense core is so strong, that matter can not stand the force and begins to collapse. The collapse of the iron core produces a neutron star and induces a massive explosion rest of the star. "
These stars are born when a massive star dies and have a mass greater than twice that of the Sun, but are the size of a city, such as 20 kilometers in diameter.
"A normal star is mainly formed with hydrogen and helium, and during his life transforms these into heavier and heavier elements. Those who have a mass greater than about 10 times the Sun, reach to produce iron at its core, which grows again, and there comes a time when the gravity that produces this dense core is so strong, that matter can not stand the force and begins to collapse. The collapse of the iron core produces a neutron star and induces a massive explosion rest of the star. "
On February 23, 1987 was observed supernova, the first visible to the eye from the time of Kepler and the birth of a neutron star. The researcher of the highest house of studies reported are now known around 2 000 500 of these stars, but astronomers estimate that the Milky Way there are hundreds of millions.
"About two thousand are known because they emit radio waves, and there are between 300 and 500, which do not emit radio and X-rays are captured because they are very energetic, " he said.
According to the doctoral thesis, Dany Page became aware the importance of superfluidity in the evolution of neutron stars, claiming that "the only ones that have this phenomenon, which can be replicated in the laboratory, but very low temperatures a few degrees Kelvin, very close to absolute zero, "he explained.
Superfluidity of neutron stars accentuates the issue of neutrinos, elementary particles with no electric charge, whose mass is so small they will not could be measured. Neutrinos originate in very special conditions and, once produced, do not interact with matter, so that the universe is almost transparent to them.
"About two thousand are known because they emit radio waves, and there are between 300 and 500, which do not emit radio and X-rays are captured because they are very energetic, " he said.
According to the doctoral thesis, Dany Page became aware the importance of superfluidity in the evolution of neutron stars, claiming that "the only ones that have this phenomenon, which can be replicated in the laboratory, but very low temperatures a few degrees Kelvin, very close to absolute zero, "he explained.
Superfluidity of neutron stars accentuates the issue of neutrinos, elementary particles with no electric charge, whose mass is so small they will not could be measured. Neutrinos originate in very special conditions and, once produced, do not interact with matter, so that the universe is almost transparent to them.
No hay comentarios:
Publicar un comentario