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Discovery and Orbital Determination of the Transient X-Ray Pulsar GRO J1750-27We 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 out- burst (less than 30 mcrab peak) lasting at least 60 days was observed during which the spin-up rate peaked at 38 pHz/s 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.
Document ID
19990071254
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Scott, D. M. (NASA Marshall Space Flight Center Huntsville, AL United States)
Finger, M. H. (NASA Marshall Space Flight Center Huntsville, AL United States)
Wilson, R. B. (NASA Marshall Space Flight Center Huntsville, AL United States)
Koh, D. T. (California Inst. of Tech. Pasadena, CA United States)
Prince, T. A. (California Inst. of Tech. Pasadena, CA United States)
Vaughan, B. A. (California Inst. of Tech. Pasadena, CA United States)
Chakrabarty, D. (Massachusetts Inst. of Tech. Cambridge, MA United States)
Date Acquired
August 19, 2013
Publication Date
October 20, 1997
Publication Information
Publication: Astrophysical Journal
Volume: 488
Subject Category
Astronomy
Funding Number(s)
CONTRACT_GRANT: NAG5-1458
CONTRACT_GRANT: NAG5-3109
CONTRACT_GRANT: NAG5-3293
Distribution Limits
Public
Copyright
Other