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I have a hunch that the frame of reference should be average motion of the stars in the neighbourhood of the star we consider, not "in the Sun's neighbourhood". It is completely non-intuitive to think about almost all stars of the bulge and from other sectors of the Milky Way as "high-velocity stars" due to such a heliocentric prejudice. Incnis Mrsi (talk) 16:08, 9 August 2012 (UTC)
There is a mention that one of the known Hypervelocity stars is believed to be from the Large Magellanic Cloud. As per this study: http://iopscience.iop.org/2041-8205/719/1/L23 It has been ruled out at the 3σ level. Just thought I'd mention it for you guys to consider... acoyauh (talk) 18:29, 3 October 2012 (CST)