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Is it an optical double or are the two main stars bound by gravity? I've read both theories so I wonder if someone has a more definite answer and can quote scientific references...

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Given what we know about the positions and masses of the three components (Albireo A, B and C), isn't it just a matter of calculation?

Or would the result be dependent on the data's interval of uncertainty (like Albireo A's distance, which is 430 ± 20 ly according to wikipedia)?

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