ASCA Observations of GRO J1744-28

Abstract

We report the ASCA results of the bursting X-ray pulsar \gro, which was observed in February 1996 and March 1997. The source flux in the 2--10 keV band was $2.0\times 10^{-8}$ erg/sec/cm${}^2$ in 1996 and $5.0\times 10^{-9}$ erg/sec/cm${}^2$ in 1997. We detected 12 and 17 Type II bursts during the two observations with mean bursting intervals of about 27 min and 37 min. Each burst is followed by an intensity dip with the depleted flux depending on the burst fluence. The energy spectra are approximated by an absorbed power law with additional structure around 6--7 keV\@. Constant absorption column, $(5-6)\times 10^{22}$ cm${}^{-2}$, independent of the observation dates and emission phases (persistent, burst and dip) is interpreted as an interstellar absorption. The source may be actually located near the Galactic center, at a distance of 8.5 kpc. The structure in the energy spectrum at 6--7 keV is most probably due to iron and maybe reproduced by a disk line model with additional broadening mechanism.

28 pages 11 figures. ApJ accepted

References in corpus (4)

• Evidence for "Propeller" Effects In X-ray Pulsars GX 1+4 And GROJ1744-28
• Thermonuclear Burning on the Accreting X-Ray Pulsar GRO J1744-28
• On the Nature of the Bursting X-Ray Pulsar GRO J1744-28
• The Pulsar in GRO J1744-28 at Low Flux

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