A new measurement of the spin and orbital parameters of the high mass X-ray binary Centaurus X-3 using AstroSat
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 ±0.000085 s in agreement with its spin up trend. The spin up timescale seems to have increased to 7709 ±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.
- Publication:
-
Journal of Astrophysics and Astronomy
- Pub Date:
- October 2021
- DOI:
- 10.1007/s12036-021-09710-w
- arXiv:
- arXiv:2103.07204
- Bibcode:
- 2021JApA...42...58S
- Keywords:
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- X-rays: binaries;
- stars: neutron;
- pulsars: individual: Centaurus X-3;
- X-rays: stars;
- methods: data analysis;
- AstroSat: LAXPC;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Accepted for publication in the Special Issue of Journal of Astrophysics and Astronomy on AstroSat: Five Years in Orbit, 7 pages, 6 figures