R Geminorum - Wikipedia

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Variable star in the constellation of Gemini R Geminorum (R Gem) is a Mira variable and technetium star in the constellation Gemini. R Geminorum pulsates with an average period of 369.9 days, varying by up to eight magnitudes at visual wavelengths. [6] R Geminorum is one of the brightest known examples of an S-type star, a type that is similar to M-type star, but whose spectra shows zirconium oxide, yttrium oxide and technetium. [7] These exotic elements are formed in the stars core. Technetium has a half-life of just 4.2 million years, so it must have been brought up from the core relatively recently.

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