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Orbital evolution studies of two HMXB pulsars

Raichur, Harsha and Paul, B and Naik, S and Bhatt, N (2006) Orbital evolution studies of two HMXB pulsars. In: Colloquium on Spectra and Timing of Compact X-ray Binaries,, Jan 17-21, 2005, Bombay, India, pp. 2785-2787.

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Official URL: http://dx.doi.org/10.1016/j.asr.2006.08.004


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.

Item Type: Conference Paper
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Astrophysics;pulsars;HMXB;high mass X-ray binary pulsars.
Department/Centre: Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Date Deposited: 01 Sep 2010 07:03
Last Modified: 19 Sep 2010 06:12
URI: http://eprints.iisc.ac.in/id/eprint/30522

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