Researchers from Lawrence Livermore National Laboratory (LLNL) with the help
Red dwarfs are stars with very low mass.As a result, they are characterized by relatively low pressure, melting rate and temperature. The generated energy comes from the nuclear fusion of hydrogen into helium during the proton-proton cycle. Also, these stars emit relatively little light.
Photo: NASA/ESA/G. Bacon (STScI)
In their article, scientists and staff of LLNLproposed a new implosion experiment at NIF to measure hydrogen. Recall that an implosion is an inward-directed explosion, as opposed to a conventional outward-directed explosion. During the experiment, it was proposed to reduce its speed, and to study high-density hydrogen using X-ray radiography.
As a result, scientists came to the conclusion that it isconvection, combined with a slow fusion rate (due to relatively low core temperatures), may allow some red dwarfs to exist for trillions of years until all hydrogen fuel is used up.
Red dwarfs are the most numerous starsMilky Way, making up 70% of all stars. But the physics of their insides is not well understood. Heat is generated in the core and propagates outward towards the surface, but it is not clear whether this process is due to radiation, convection, or a combination of the two. A key factor in determining whether red dwarfs are predominant radiation or convection is the state of the internal hydrogen.
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