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Paper: Astrometric distances of globular clusters
Volume: 4, The Extragalactic Distance Scale: Proceedings of the ASP 100th Anniversary Symposium
Page: 172
Authors: Cudworth, Kyle M.; Peterson, Ruth
Abstract: The distance scale of globular clusters has generally been based on horizontal branch stars as standard candles or on main sequence fitting to subdwarfs. Checks on this scale using independent techniques generally show good agreement with standard candle distances, but individual uncertainties are too large to provide definitive checks. Cross-correlation techniques are now capable of yielding radial velocities of globular cluster giants with errors less than 1 km/s, compared with typical cluster velocity dispersions larger than 5 km/s. The application of this technique to M22 is shown.
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