Just learned tonight that apparently what I was taught in my chemistry/physics undergrad classes was inaccurate in that transuranic elements can exist in nature. I was told that Uranium was the heaviest element in nature at both the University of Michigan and at Michigan State University back in the 1990's.
https://ui.adsabs.ha.....149W/abstract and "Intelligent Life in the Universe" by I. S. Schklovskii and Carl Sagan, 1966 both propose the possibility that an alien civilization could have used their star as a nuclear dumping ground or put heavy artificial elements into their star as a marker that they have civilized life in that system.
There is also the odd possibility that the short lived half life elements are degradation products from heavy stable elements that we haven't been able to synthesize on Earth yet.
Another bizarre thing about this class of star is that they are very low in Iron. This makes the case that the heavy elements came from a supernova or a neutron star less likely.
Please be respectful in this discussion so it won't get shut down. There is no proof that this is or isn't a sign of an alien civilization, just different hypothesized origins for the spectroscopic findings from a bizarre star. There are plenty of youtube videos about this mystery object for those that are interested.