Discovery and Orbital Determination of the Transient X‐Ray Pulsar GRO J1750−27 | Zendy

Donia Scott | Zendy; M. H. Finger | Zendy; Robert Wilson | Zendy; Danny T. Koh | Zendy; Thomas A. Prince | Zendy; Brian Vaughan | Zendy; Deepto Chakrabarty | Zendy

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

Author(s) -

Donia Scott,

M. H. Finger,

Robert Wilson,

Danny T. Koh,

Thomas A. Prince,

Brian Vaughan,

Deepto Chakrabarty

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/304740

Subject(s) - physics , pulsar , orbital period , astrophysics , sky , astronomy , orbit (dynamics) , x ray pulsar , neutron star , transient (computer programming) , accretion disc , accretion (finance) , be star , stars , computer science , operating system , engineering , aerospace engineering

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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