  We have analyzed 0.35-7.5 keV X-ray spectra of the center of the Perseus
cluster collected using the Broad Band X-Ray Telescope (BBXRT) on the Astro-1
mission. These spectra are particularly useful for examining the nature of the
X-ray absorber in cooling flows because of BBXRT's sensitivity between 0.35 and
1.0 keV. We confirm that there is X-ray absorption above that expected from gas
in our own galaxy. Further, the absorbing medium is deficient in helium.
However, the energy of the K-edge of oxygen is consistent with neutral material
(at the redshift of the cluster) and is not consistent with any ionized state
of oxygen. It is not possible to completely ionize helium and have oxygen
neutral so the apparent helium deficiency cannot be due to ionization. We
propose that the X-ray absorption is due to dust grains that have condensed out
of a medium in which helium remains ionized. This model satisfies all the
observational constraints but is difficult to understand theoretically.
