Technetium star

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What Wikipedia says

A technetium star, or more properly a Tc-rich star, is a star whose stellar spectrum contains absorption lines of the radioactive metal technetium. The most stable isotope of technetium is 97Tc with a half-life of 4.21 million years: too short a time to last for the age of the Earth (about 4.5 billion years).

Excerpt from the Wikipedia article “Technetium star”, under the CC BY-SA 4.0 license. Read the article on Wikipedia