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A redetermination of the proper motion of HD 27507
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| HD 27507 - A star escaping from our galaxy
HD 27507 is a horizontal-branch star with a radial velocity of 348 km/s.Its galactocentric velocity (368 km/s) is very little affected by apossible error in the adopted circular velocity in the vicinity of thesun. Since it is very unlikely that a star with a galactocentricvelocity within 10 km/s of the escape velocity is found, it can beconcluded that the escape velocity is at least 378 + or - 20 km/s. Theredetermination of the proper motion of HD 27507 can substantiallyreduce the margin of uncertainty.
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