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09 July, 2020
4 Min Read
Part of: GS-III- S&T (PT-MAINS-PERSONALITY TEST)
Recently, scientists from the Indian Institute of Astrophysics (IIA) have provided evidence for the first time that Lithium (Li) production is common among low mass Sun-like stars during their Helium (He) core burning phase.
IIA is an autonomous institute of the Department of Science and Technology (DST), Government of India.
Findings of the Study:
Scientists performed a large-scale systematic investigation of the ‘He-flash’ (on-set of He-ignition at the star's core via violent eruption), at the end of the star’s core hydrogen-burning phase
Hydrogen burning is the fusion of hydrogen nuclei into a helium nucleus. This He-flash has been identified as the source of Li production suggesting that all low-mass stars undergo Li production.
Our Sun will reach this phase in about 6-7 billion years and will manufacture Li. The study challenges the long-held idea that stars only destroy lithium and indicates that there is some physical process missing in stellar theory.
Earlier, it was believed that a vast majority of stars with a mass similar to that of the Sun destroy Li gradually over the course of their lives, via low-temperature nuclear burning.
The study also suggests new limits (A(Li) > -0.9~dex) for classifying stars as Li-rich, which is 250 times below the threshold (A(Li) > 1.5~dex) used till now.
Origin of Lithium:
Usage of Lithium: (PT SHOT)
Source: PIB
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