53 probable members of a group of old disk stars appear to be moving with Arcturus (O. J. Eggen, 1971). (solstation.com)
The thick disk is generally formed of old stars that may lie several thousand light - years (ly) above or below the galactic plane, unlike thin disk stars such as Sol which typically lie within a thousand ly. (solstation.com)
When comparing the chemical compositions of these stars with the ones found in other cosmic structures, the scientists were surprised to find that the chemical compositions are almost identical, both within and between these groups, and closely match the abundance patterns of the Milky Way outer disk stars. (sciencedaily.com)