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The Iron K-shell features of MXB 1728-34 from a Simultaneous Chandra-RXTE Observation

By A D Ai, T D Salvo, R Iaria, M Méndez, L Burderi, G Lavagetto, W H G Lewin, N R Robba, L Stella and M Van der Klis

Abstract

We report on a simultaneous Chandra and RossiXTE observation of the low-mass X-ray binary atoll bursting source MXB 1728-34 performed on 2002 March 3-5. We fit the 1.2-35 keV continuum spectrum with a blackbody plus a Comptonized component. Large residuals at 6-10 keV can be fitted by a broad (FWHM ~ 2 keV) Gaussian emission line or, alternatively, by two absorption edges associated with lowly ionized iron and Fe XXV/XXVI at ~7.1 keV and ~9 keV, respectively. In this interpretation, we find no evidence of broad, or narrow, emission lines between 6 and 7 keV. We test our alternative modelling of the iron K shell region by reanalysing a previous BeppoSAX observation of MXB 1728-34, finding a general agreement with our new spectral model

Topics: Astrophysics and Astronomy
Year: 2005
OAI identifier: oai:cds.cern.ch:903704
Provided by: CERN Document Server
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