I'm not sure how it interacts with the halo finding / FOF machinery, but you may be interested in this docs page on particle filters:

http://yt-project.org/docs/dev/analyzing/filtering.html#filtering-particle-fields

On Wed, Sep 2, 2015 at 2:43 PM, José Utreras <jutreras@das.uchile.cl> wrote:
Hi everyone

I'm working with Enzo and I'm trying to identify groups of stars particles. Now I wanted to create groups but only of young stars. I thought using HOP but I don't see how to filter particles before crating the groups.

Thanks!

Jose

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