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Orbital evolution studies of two HMXB pulsars |
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| Authors: | H Raichur B Paul S Naik N Bhatt |
| Institution: | aJoint Astronomy Program, Indian Institute of Science, Bangalore 560012, India bTata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India cInstitute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229 8510, Japan dTheoretical Astrophysics Section, Astrophysical Sciences Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India |
| Abstract: | High mass X-ray binary (HMXB) pulsars are of two types, persistent and transient. 4U1538?52 is a persistent HMXB whose orbit was previously measured to be circular but the RXTE observations revealed an eccentric orbit. We observed this system with RXTE-PCA in August 2003 and our timing analysis supports the eccentric orbit of the system. However, we do not find any evidence for orbital evolution. Rotational and tidal interactions between the stars of a closed binary system result in apsidal motion which can be measured in systems with eccentric orbit. 4U0115+63 is a Be-transient HMXB whose eccentric orbit was well-determined during its 1978 outburst. We report preliminary results from analysis of data obtained during the 1999 outburst of this source with the RXTE-PCA. |
| Keywords: | Astrophysics Pulsars HMXB high mass X-ray binary pulsars |
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