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Lithium burning is anucleosynthetic process in whichlithium is depleted in astar. Lithium is generally present inbrown dwarfs and not in older low-mass stars. Stars, which by definition must achieve the high temperature (2.5 million K) necessary for fusinghydrogen, rapidly deplete their lithium.
Burning ofthe most abundant isotope of lithium, lithium-7, occurs by a collision of lithium-7 and aproton producingberyllium-8, which promptly decays into twohelium-4 nuclei. The temperature necessary for this reaction is just below the temperature necessary forhydrogen fusion. Convection in low-mass stars ensures that lithium in the whole volume of the star is depleted.[1] Therefore, the presence of the lithiumline in a candidate brown dwarf's spectrum is a strong indicator that it is indeed substellar.
From a study of lithium abundances in 53T Tauri stars, it has been found that lithium depletion varies strongly with size, suggesting that lithium burning by theP-P chain, during the last highly convective and unstable stages during thepre–main sequence later phase of theHayashi contraction may be one of the main sources of energy for T Tauri stars. Rapid rotation tends to improve mixing and increase the transport of lithium into deeper layers where it is destroyed. T Tauri stars generally increase their rotation rates as they age, through contraction and spin-up, as they conserve angular momentum. This causes an increased rate of lithium loss with age. Lithium burning will also increase with higher temperatures and mass, and will last for at most a little over 100 million years.
The P-P chain for lithium burning is as follows
It will not occur in stars less than sixty times the mass of Jupiter. In this way, the rate of lithium depletion can be used to calculate the age of the star.
The use of lithium to distinguish candidate brown dwarfs from low-mass stars is commonly referred to as thelithium test. Heavier stars like theSun can retain lithium in their outer atmospheres, which never get hot enough for lithium depletion, but those are distinguishable from brown dwarfs by their size. Brown dwarfs at the high end of their mass range (60–75MJ) can be hot enough to deplete their lithium when they are young. Dwarfs of mass greater than 65MJ can burn off their lithium by the time they are half a billion years old; thus, this test is not perfect.[2]