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You'll probably have to wing it a little depending on whether they are astronomers themselves, because that will depend on what gives them the wow factor. Depending on the outcome of the above question I find double stars can sometimes give that wow factor. Especially stars like alpha cent. and albireo. There are several lists even on this forum of beautiful double stars. I'm not sure where I saw it but there is one floating around on the net which lists Doubles with large colour differences between the A & B component, and above all have fun.
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