They conclude that at least those famous "members" of the Castor Moving Group (Fomalhaut, Vega, Castor, LP 944-20) are extremely unlikely to have shared a common origin.
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The stars that have been identified as part of the group include Castor, Fomalhaut, Vega, α Cephei and α Librae.
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In their 2013 paper describing the discovery of Fomalhaut C, Mamajek et al. point out that the 3D velocities of the famous Castor Moving Group members Fomalhaut, Vega, Castor, and LP 944-20 are now very well-determined.
In May 2008, Paul Kalas and James Graham identified Fomalhaut b from Hubble/ACS images taken in 2004 and 2006 at visible wavelengths (i.e. 0.6 and 0.8 µm).