Title:	Change in spin-down rate and detection of emission line in HMXB 4U 2206+54 with AstroSat observation
Authors:	Jain, Chetana Yadav, Ajay Sharma, Rahul
Keywords:	x-rays stars neutron pulsars astrophysics high energy astrophysical phenomena
Issue Date:	19-Dec-2022
Publisher:	Indian Academy of Sciences
Citation:	Jouranl of Astrophysics and Astronomy, 2022, Vol.43, p101
Abstract:	his work presents timing and spectral analysis of 4U 2206+54 using data obtained from LAXPC instrument onboard India's AstroSat mission. This source was observed with AstroSat in September-October 2016. We report detection of 5648 (4) s pulsations at MJD 57669 in the latter observation of 4U 2206+54. The pulse profile is sinusoidal and the inherent shape is independent of energy up to 30 keV. The pulse fraction increases with energy from ∼0.5 to ∼0.8%. We report an updated spin-down rate of 2.95 (14 ) ×10-7 s s-1. This is about 0.40 times smaller than the previously reported long term value. The energy spectrum is best modeled with an absorbed power-law with high energy exponential cut-off. We have detected presence of broad emission line in 4U 2206+54 at an energy of 7 keV with equivalent width of ∼0.4 keV.
Description:	Open Access from Indian Academy of Sciences
URI:	http://hdl.handle.net/2289/8026
ISSN:	0250-6335 0973-7758 (Online)
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2022JApA...43..101J/abstract https://arxiv.org/abs/2208.12969 https://doi.org/10.1007/s12036-022-09890-z https://inspirehep.net/literature/2142730
Copyright:	2022 Indian Academy of Sciences, Bengaluru
Appears in Collections:	Research Papers (A&A)

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