A ROSAT observation of the transient X-ray pulsar GRO J1008-57

Details A ROSAT observation of the transient X-ray pulsar GRO J1008-57 A ROSAT observation of the transient X-ray pulsar GRO J1008-57

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282l..33p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 3, p. L33-L36

Astronomy and Astrophysics

Astronomy

7

Binary Stars, Pulsars, Spaceborne Astronomy, Stellar Spectra, X Ray Astronomy, X Ray Stars, Astronomical Spectroscopy, Gamma Ray Observatory, Light Curve, Power Series, Proportional Counters, Rosat Mission

Scientific paper

We report results of a brief Target of Oppurtunity observation of the newly discovered transient X-ray pulsar Gamma Ray Observatory (GRO) J1008-57 using the ROSAT Position Sensitive Proportional Counter (PSPC). The observation was performed well into the decline of the source outburst as monitored by the BATSE hard X-ray light curve. The PSPC cleanly detected the source, at a 0.1-2.4 keV flux of 2.3 x 10-11 erg/sq cm/s. A position centroid accurate to 10 arc seconds has been determined. The 0.1-2.4 keV spectrum is best characterized by a flat power law with substantial interstellar absorption. The PSPC photon index and column density are consistent with that measured at higher energy by ASCA; there is no evidence for an additional soft component. Light-curve folding reveals a period of 93.4 s, consistent with that measured at higher energies; the 0.1-2.4 keV folded light curve shows a high pulsed fraction and a strongly double-peaked pulse profile. The spectral and temporal properties of GRO J1008-57 as observed using the PSPC are entirely consistent with a pulsar orbiting a massive (OB) companion.

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