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http://hdl.handle.net/2289/6634
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 |
URI: | http://hdl.handle.net/2289/6634 |
ISSN: | 0035-8711 1365-2966 - (online) |
Alternative Location: | http://adsabs.harvard.edu/abs/2016MNRAS.463.2032A http://arxiv.org/abs/1608.06297 http://dx.doi.org/10.1093/mnras/stw2037 |
Copyright: | 2016 The authors & the Royal Astronomical Society |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2016_MNRAS_463_2032.pdf | Open Access | 618.03 kB | Adobe PDF | View/Open |
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