Discovery and Orbital Determination of the Transient X-Ray Pulsar GRO J1750-27

Details Discovery and Orbital Determination of the Transient X-Ray Pulsar GRO J1750-27 Discovery and Orbital Determination of the Transient X-Ray Pulsar GRO J1750-27

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488..831s&link_type=abstract

Astrophysical Journal v.488, p.831

Astronomy and Astrophysics

Astronomy

25

X-Rays: Stars, Stars: Pulsars: Individual Alphanumeric: Gro J1750-, 7

Scientific paper

We report on the discovery and hard X-ray (20--70 keV) observations of the 4.45 s period transient X-ray pulsar GRO J1750-27 with the BATSE all-sky monitor on board CGRO. A relatively faint outburst (<30 mcrab peak) lasting at least 60 days was observed during which the spin-up rate peaked at 38 pHz s-1 and was correlated with the pulsed intensity. An orbit with a period of 29.8 days was found. The large spin-up rate, spin period, and orbital period together suggest that accretion is occurring from a disk and that the outburst is a "giant" outburst typical of a Be/X-ray transient system. No optical counterpart has yet been reported.

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