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We present results of an observation with Suzaku of the dipping, periodicbursting low mass X-ray binary XB 1323-619. Using the energy band 0.8 - 70 keV,we show that the source spectrum is well-described as the emission of anextended accretion disk corona, plus a small contribution of blackbody emissionfrom the neutron star. The dip spectrum is well-fitted by the progressivecovering model in which the extended ADC is progressively overlapped by theabsorbing bulge of low ionization state in the outer accretion disk and thatdipping is basically due to photoelectric absorption in the bulge. Anenergy-independent decrease of flux at high energies (20 - 70 keV) is shown tobe consistent with the level of Thomson scattering expected in the bulge. Anabsorption feature at 6.67 keV (Fe XXV) is detected in the non-dip spectrum andother possible weak features. In dipping, absorption lines of medium and highlyionized states are seen suggestive of absorption in the ADC but there is noevidence that the lines are stronger than in non-dip. We show that theluminosity of the source has changed substantially since the Exosat observationof 1985, increasing in luminosity between 1985 and 2003, then in 2003 - 2007falling to the initial low value. X-ray bursting has again become periodic,which it ceased to do in its highest luminosity state, and we find that theX-ray bursts exhibit both the fast decay and later slow decay characteristic ofthe rp burning process. We present arguments against the recent proposal thatthe decrease of continuum flux in the dipping LMXB in general can be explainedas absorption in an ionized absorber rather than in the bulge in the outer diskgenerally accepted to be the site of absorption.

Neutral absorber dips in the periodic burster LMXB XB 1323-619 from Suzaku