Abstract Details
| Name: Sanhita Affiliation: Raman Research Institute Conference ID: ASI2017_1200 Title : An intriguing partial eclipse in the high mass X-ray binary pulsar IGR J16393–4643 Authors and Co-Authors : Nazma Islam(1), Biswajit Paul (2). 1.Nicolaus Copernicus Astronomical Center, Poland. 2. Raman Research Institute, Bangalore-560080, India. Abstract Type : Oral Abstract Category : Stars,ISM and the Galaxy Abstract : We will report discovery of an intriguing partial eclipse in the high mass X-ray binary pulsar IGR J16393-4643. In accreting X-ray pulsars, which are high magnetic field neutron starts, the X-rays are emitted from a small region, no larger than a few km. The eclipses in such systems are therefore expected to be complete. In most eclipsing HMXBs, the X-ray eclipses are about two orders of magnitude fainter compared to the out of eclipse emission. In contrast, we have found the hard X-ray eclipse in IGR J16393-4643 to be narrow and partial casting doubt if it is indeed an eclipse. We have carried out a further soft X-ray study of IGR J16393-4643 using a large number of observations with Swift-XRT. The soft X-ray observations also show a partial eclipse, with the intensity in the eclipse being about ∼30% of the intensity outside the eclipse. In eclipsing HMXBs, the absorption column density shows increase just before and after the eclipse and the equivalent width of iron emission shows large increase during the eclipse. We have also carried out spectroscopy with the XRT data, though with limited statistics, over the entire binary orbital phase to measure the absorption column density and equivalent width of iron emission line, if any. |