Lithium Dip Found in Unexpectedly Young Stars ⚡ экспресс
In the young 'Serpens' cluster (age 35±5 million years), a lithium dip has been discovered in stars with temperatures of 6200–6800 K — 100 million years earlier than previously thought. Fast-rotating stars (v sin i > 25 km/s) lose more lithium: likely, rotation enhances mixing at the boundary of the convective zone. It's like a cosmic centrifuge: the faster the spin, the more vigorous the mixing and the destruction of lithium. The finding reshapes our understanding of light element evolution in young stars.
By breaking down the light of the 'Serpens' cluster with spectroscopy (a method that splits light into its component colors), astronomers found that stars start losing lithium as early as 35 million years — four times sooner than thought. This changes our understanding of how sun-like stars mature.
The cause is rotation. A star works like a giant blender: rapid rotation mixes the material, dragging lightweight lithium into the hot interior where it burns up. The faster it spins, the harder it 'mixes' and the sooner the lithium disappears.
The most unexpected twist: this lithium is primordial, born in the Big Bang. Its early disappearance means that stars destroy cosmic 'fossil' elements faster, and we'll have to rethink how galaxies accumulate light elements.
🎯 Lithium is one of the three elements born in the Big Bang, along with hydrogen and helium. Its abundance in the Universe serves as a crucial test of cosmological theories.
🎬 Sci-fi writers often portray stellar cycles as slow processes, but here lithium destruction is accelerated by rotation, like a cosmic blender with a 'turbo' button.