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Title: Variability study of the High Mass X-ray binary IGR J18027-2016 with Swift-XRT.
Authors: Aftab, Nafisa
Islam, Nazma
Paul, Biswajit
Issue Date: Dec-2016
Publisher: Oxford University Press for The Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2016, Vol. 463, p2032-2038
Abstract: We report the results from pulsations and spectral analysis of a large number of observations of the high-mass X-ray binary pulsar IGR J18027−2016 with Swift X-ray Telescope (XRT), carried out at different orbital phases. In some orbital phases, as seen in different XRT observations, the X-ray intensity is found to vary by a large factor, of about ∼50. In all the observations with sufficient number of source X-ray photons, pulsations have been detected around the previously known pulse period of ∼140 s. When detected, the pulse profiles do not show any significant variation over a flux difference of a factor of ∼3. The absorption column density is found to be large before and after the eclipse. We discuss various possible reasons for intensity and spectral variations in IGR J18027−2016, such as clumpy wind and hydrodynamic instabilities.
Description: Open Access
ISSN: 0035-8711
1365-2966 - (online)
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Copyright: 2016 The authors & the Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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