Abstract
We present the timing results of out-of-eclipse observations of Centaurus X-3 spanning half a binary orbit, performed on 12–13 December, 2016 with the Large Area X-ray Proportional Counter (LAXPC) on-board AstroSat. The pulse profile was confirmed to exhibit a prominent pulse peak with a secondary inter-pulse. The systemic spin period of the pulsar was found to be \(4.80188 \pm 0.000085\) s in agreement with its spin up trend. The spin up timescale seems to have increased to \(7709 \pm 58\) yr that points to negative torque effects in the inner accretion disk. We also report the derived values of projected semi-major axis and orbital velocity of the neutron star.
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Acknowledgements
The research is based to a significant extent on the results obtained from the AstroSat mission of the Indian Space Research Organisation (ISRO), archived at the Indian Space Science Data Centre (ISSDC). This work has used data from the Large Area X-ray Proportional Counter (LAXPC) detectors developed at TIFR, Mumbai and we thank the LAXPC Payload Operation Centre for verification and release of the data on the ISSDC data archive and providing the requisite software for analysis. We thank the AstroSat Science Support Cell (ASSC) hosted at IUCAA for technical assistance. This research has made use of the High Energy Astrophysics Software obtained through the High Energy Astrophysics Science Archive Research Center (HEASARC) Online Service, provided by the NASA/Goddard Space Flight Center (GSFC), in support of NASA’s High Energy Astrophysics Programs. This research has also made use of the NumPy and SciPy packages in Python. Valuable suggestions from an anonymous referee have improved the presentation of this paper.
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This article is part of the Special Issue on “AstroSat: Five Years in Orbit”.
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Shirke, P., Bala, S., Roy, J. et al. A new measurement of the spin and orbital parameters of the high mass X-ray binary Centaurus X-3 using AstroSat. J Astrophys Astron 42, 58 (2021). https://doi.org/10.1007/s12036-021-09710-w
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DOI: https://doi.org/10.1007/s12036-021-09710-w