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A Sequence of Outbursts from the Transient X-Ray Pulsar GS 0834-430

Wilson, Colleen A. and Finger, Mark H. and Harmon, B. Alan and Scott, D. Matthew and Wilson, Robert B. and Bildsten, Lars and Chakrabarty, Deepto and Prince, Thomas A. (1997) A Sequence of Outbursts from the Transient X-Ray Pulsar GS 0834-430. Astrophysical Journal, 479 . pp. 388-397. ISSN 0004-637X. doi:10.1086/303841.

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GS 0834-430, a 12.3 s accretion-powered pulsar, has been observed in seven outbursts with the BATSE large-area detectors on the Compton Gamma Ray Observatory. The first five outbursts observed by BATSE occurred at intervals of about 107 days, while the final two outbursts were separated by about 140 days. The photon energy spectrum, measured by Earth occultation in the 20-100 keV band, can be fitted by a power law with photon index α ≈ -3.7 or by an exponential spectrum with temperature kT ≈ 15 keV, with some variations within outbursts. The source has a low pulse fraction, ≾ 0.15 in the 20-50 keV band. We have observed significant temporal and energy-dependent variations in epoch folded pulse profiles. Because the intrinsic torque effects for this system are at least comparable to orbital effects, pulse timing analysis did not produce a unique orbital solution. However, confidence regions for the orbital elements yielded the following 1 σ limits: orbital period P_(orb) = 105.8 ± 0.4 days and eccentricity 0.10 ≾ e ≾ 0.17. GS 0834-430 is most likely a Be/X-ray binary.

Item Type:Article
Related URLs:
URLURL TypeDescription
Chakrabarty, Deepto0000-0001-8804-8946
Prince, Thomas A.0000-0002-8850-3627
Additional Information:© 1997 American Astronomical Society. Received 1995 September 15, accepted for publication 1996 October 2. This work was supported in part by NASA grant NAG 5-1458. L. B. was supported by the Alfred P. Sloan Foundation. D. C. was supported by a NASA GRSP Graduate Fellowship under grant NGT-51184 and a NASA Compton Postdoctoral Fellowship under grant NAG 5-3109. We thank an anonymous referee for helpful comments.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
NASANAG 5-1458
Alfred P. Sloan FoundationUNSPECIFIED
NASA Compton FellowshipNAG 5-3109
Subject Keywords:binaries: general; pulsars: individual (PSR GS 0834–430); stars: neutron; X-rays: stars
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1997-02
Record Number:CaltechAUTHORS:20140703-224047017
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46852
Deposited By: Deborah Miles
Deposited On:14 Jul 2014 16:11
Last Modified:10 Nov 2021 17:30

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