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   62159
   Although ROSAT pointed observations have shown that many groups emit X-
   rays, the groups with the highest ROSAT flux are expected to be found
   in the All Sky Survey (RASS). Here, we propose continued observation of
   the brightest X-ray selected groups from a cross-correlation of the
   RASS with an optical catalog of groups from the Zwicky catalog. There
   are now only ~ dozen ASCA spectra for groups, and these show that
   groups vary widely in their abundance and baryon fraction. Continued
   high quality spectral measurements will help us understand this
   variation: the data will provide temperature and abundance profiles as
   well as the abundance of Si relative to Fe to constrain the origin of
   the X-ray emitting gas, the form of the potential, and the total mass
   of these systems.
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