• Dr. Santvana Bapna
• Dr. Yogita Shrimali

EXO 053109-6609.2 and LMC X-4 are transient sources. These pulsars are situated at a distance 17’ and ever observed simultaneously in the field of view of the narrow field instrument of BeppoSAX. We adopted the data of RXTE for LMC X-4 having time resolution 0.125 s and data of BeppoSAX LECS and MECS with time resolution of 0.25s. We did comparative timing study of LMC X-4 and EXO 053109-6609.2. RXTE exclusively observed LMC X-4 in December 1999 which was closely the source time of observations of January 2000 of BeppoSAX LECS and MECS. We applied barycenter correction for photon arrival times in the event files before extraction of light curves. With the help of RXTE, we obtained the pulse period of 13.5s for LMC X-4 and 13.7 s for EXO053109-6609.2 with the help of BeppoSAX. Both the pulsars show almost same pulsation time and may be due to same category of HMXBs. Pulse-profile was obtained from the background subtracted light curves in various energy range 2-5 kev,5-8 kev and 8-11 kev. These indicated that X-rays are emitted from the central part of the accretion disk. The pulse-profile clearly shows luminosity dependence with a single peaked profile only at low luminosity and a double peak profile at high luminosity which is clear from the pulse fraction i.e. 30% to 60%.

Pulsar, RXTE, Beppo SAX, HMBs, Accretion disk

"Comparative Timing Studies of LMC X-4 and EXO 053109-6609.2", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 5, page no.i627-i633, May-2022, Available :http://www.jetir.org/papers/JETIR2205991.pdf

"Comparative Timing Studies of LMC X-4 and EXO 053109-6609.2", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 5, page no. ppi627-i633, May-2022, Available at : http://www.jetir.org/papers/JETIR2205991.pdf