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The star is rich in elements heavier than hydrogen ("metals rich"), as it has about 1.4 times the iron abundance of Sol, and dust has been detected in the system (Kuchner and Brown, 2000 -- in postscript). It was probably enriched by its companion star, which was once bigger and hotter than Procyon A and so evolved and "burnt out" even faster. Procyon B manufactured lots of heavier elements which it puffed out into space and onto Procyon A before becoming a white dwarf.
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H. Bond (STSci), R. Ciardullo (PSU), WFPC2, HST, NASA
(Procyon B is a white dwarf, a remnant stellar core, which enriched Procyon A with elements
heavier than hydrogen when it cast off its outer gas layers, like planetary nebula NGC 2440)
Link to the originating page providing this information
solstation.com
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