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We measure the intrinsic magnitude dispersion of the Galactic bulge red clump(RC) using two different methods and arrive at an estimate of \sigma_{I} ~ 0.17mag. We first estimate the width of the RC by analyzing in detail a sample ofRC measurements toward double RC sightlines, which are toward regions of thebulge that are geometrically thin. We obtain \sigma_{I} ~ 0.17 mag. We thenestimate the value by comparing the luminosity function for bulge RC and redgiant (RG) stars in V to that in I for a sightline near the plane, and weobtain a value of \sigma_{I} ~ 0.14-0.17 mag. This result has structural andevolutionary repercussions. It constrains model estimates of the bar'sorientation angle derived from RC studies as well as the inferredcharacteristic length of the bar for a given characteristic height. Moreover,the value is too large to account for using the predicted evolutionary effectsof the known metallicity distribution, implying the presence of otherpopulation effects.

The Intrinsic I-Band Magnitude Dispersion of the Galactic Bulge Red Clump