It seems the questions of whether or not Albiero is a true Binary is an open question. In reading several articles the word "if" is used a lot when talking about their binary status. Apparently we're still not sure, at least not in anything I could find. Doesn't change the beauty of the pair (triplet?) fortunately.
From the U of Illinois:
http://www.astro.illinois.edu/~jkaler/sow/albireo.html Robert Taylor -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Joe Bauman Sent: Sunday, May 17, 2009 1:01 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] Albireo: a double star? The APOD for Aug. 30, 2005, has this: Explanation: Sometimes, even a small telescope can help unlock a hidden beauty of the heavens. Such is the case of the bright double star Albireo. Seen at even slight magnification, Albireo unfolds from a bright single point into a beautiful double star of strikingly different colors. At 380 light years distant, the two bright stars of Albireo are comparatively far from each other and take about 75,000 years to complete a single orbit. The brighter yellow star is itself a binary star system, but too close together to be resolved even with a telescope. Albireo, pictured above, is the fifth brightest star system toward the constellation of the Swan (Cygnus) and easily visible to the unaided eye. -- If they take 75,000 years for one go-round, we can't see the motion. This makes it seem that NASA has concluded that they are a true physical binary, however. -- Joe