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   61221
   ASCA has observed several groups of galaxies and detect unusually low
   metal abundances in their intergalactic gas, however, the most of the
   ASCA samples are selected from the Hickson's compact groups, which have
   abnormally high galactic density. To obtain the properties of normal
   galaxy groups, we propose to observe X-ray selected groups in the ROSAT
   North Ecliptic Pole Survey. The goals of the observations are to obtain
   fundamental parameters, gas mass, gravitational mass, temperature, and
   abundances, to investigate the dynamical and chemical evolution of
   groups.
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