X-ray spectral evolution of low-mass X-ray binary GX 349+2

V. K. Agrawal; P. Sreekumar

doi:10.1111/j.1365-2966.2003.07147.x

X-ray spectral evolution of low-mass X-ray binary GX 349+2

V. K. Agrawal^*, P. Sreekumar

^*Corresponding author for this work

Manipal Centre for Natural Sciences, Manipal

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

We present the results of a systematic investigation of spectral evolution in the Z source GX 349+2, using data obtained during 1998 with the Proportional Counter Array (PCA) onboard the RXTE satellite. The source traced a extended normal branch (NB) and flaring branch (FB) in the colour-colour diagram (CD) and the hardness-intensity diagram (HID) during these observations. The spectra at different positions of the Z-track were best fitted by a model consisting of a disc blackbody and a Comptonized spectrum. A broad (Gaussian) iron line at ∼6.7 keV is also required to improve the fit. The spectral parameters showed a systematic and significant variation with the position along the Z-track. The evolution in spectral parameters is discussed in view of the increasing mass accretion rate scenario, proposed to explain the motion of Z sources in the CD and the HID.

Original language	English
Pages (from-to)	933-939
Number of pages	7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	346
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-2966.2003.07147.x
Publication status	Published - 11-12-2003

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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Cite this

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title = "X-ray spectral evolution of low-mass X-ray binary GX 349+2",

abstract = "We present the results of a systematic investigation of spectral evolution in the Z source GX 349+2, using data obtained during 1998 with the Proportional Counter Array (PCA) onboard the RXTE satellite. The source traced a extended normal branch (NB) and flaring branch (FB) in the colour-colour diagram (CD) and the hardness-intensity diagram (HID) during these observations. The spectra at different positions of the Z-track were best fitted by a model consisting of a disc blackbody and a Comptonized spectrum. A broad (Gaussian) iron line at ∼6.7 keV is also required to improve the fit. The spectral parameters showed a systematic and significant variation with the position along the Z-track. The evolution in spectral parameters is discussed in view of the increasing mass accretion rate scenario, proposed to explain the motion of Z sources in the CD and the HID.",

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AB - We present the results of a systematic investigation of spectral evolution in the Z source GX 349+2, using data obtained during 1998 with the Proportional Counter Array (PCA) onboard the RXTE satellite. The source traced a extended normal branch (NB) and flaring branch (FB) in the colour-colour diagram (CD) and the hardness-intensity diagram (HID) during these observations. The spectra at different positions of the Z-track were best fitted by a model consisting of a disc blackbody and a Comptonized spectrum. A broad (Gaussian) iron line at ∼6.7 keV is also required to improve the fit. The spectral parameters showed a systematic and significant variation with the position along the Z-track. The evolution in spectral parameters is discussed in view of the increasing mass accretion rate scenario, proposed to explain the motion of Z sources in the CD and the HID.

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X-ray spectral evolution of low-mass X-ray binary GX 349+2

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