moving groups demoted

Bovy finished another draft round on our first Hipparcos papers, one an immense method paper and one with some results, using Geneva-Copenhagen Survey to externally vet any Hipparcos-inferred structure in the velocity distribution. We find that this conservative method disfavors some of the less-significant structures claimed in the literature, and that there are no moving groups strongly evident in the Hipparcos data that weren't known prior to Hipparcos. Bad news for Hipparcos, but it does mean that we have something useful to contribute to this literature.

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