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Discovery of a New Pulsating X-Ray Source with a 1549.1 Second Period, AX J183220–0840

A new pulsating X-ray source, AX J183220-0840, with a 1549.1 s period was discovered at R.A. = 18h32m20s and decl. = -8°40′30′′ (J2000, with an uncertainty of 0.′6) during an ASCA observation on the Galactic plane. The source was observed two times, in 1997 and in 1999. A phase-averaged X-ray flux of 1.1 × 10-11 ergs cm-2 s-1 and a pulsation period of 1549.1 ± 0.4 s were consistently obtained from these two observations. The X-ray spectrum was represented by a flat, absorbed power law with a photon index of Γ ≃ 0.8 and an absorption column density of NH ≃ 1.3 × 1022 cm-2. Also, a signature of iron K-shell line emission with a centroid of 6.7 keV and an equivalent width of approximately 450 eV was detected. From the pulsation period and the iron-line feature, AX J183220-0840 is likely to be a magnetic white dwarf binary with a complexly absorbed thermal spectrum with a temperature of about 10 keV.