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Published October 20, 1997 | Version Published
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Discovery and Orbital Determination of the Transient X-ray Pulsar GRO J1750-27

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Abstract

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.

Additional Information

© 1997 American Astronomical Society. This work was supported in part by the National Aeronautics and Space Administration (NASA) under grants NAG 5-3293 and NAG 5-1458. D. C. was supported by a NASA Compton GRO Postdoctoral Fellowship under grant NAG 5-3109. We also thank the anonymous referee for useful comments.

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Eprint ID
51826
Resolver ID
CaltechAUTHORS:20141117-094031229

Related works

Describes
http://adsabs.harvard.edu/abs/1997ApJ...488..831S (URL)

Funding

NASA
NAG 5-1458
NASA
NAG 5-1458
NASA Compton Fellowship
NAG 5-3109

Dates

Created
2014-11-19
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Updated
2020-03-09
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Space Radiation Laboratory
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Space Radiation Laboratory
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1997-32