The iron K-shell features of MXB 1728-34 from a simultaneous Chandra-RXTE observation

A. D'Aí, T. di Salvo, R. Iaria, M. Méndez, L. Burderi, G. Lavagetto, W. H. G. Lewin, N. R. Robba, L. Stella, M. van der Klis

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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 emission lines between 6 and 7 keV. We test our alternative model 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.
Original languageEnglish
Pages (from-to)817-822
JournalAstronomy and astrophysics
Issue number3
Publication statusPublished - 1-Mar-2006
Externally publishedYes


  • accretion
  • accretion disks
  • stars: individual: MXB 1728-34
  • stars: neutron
  • X-rays: stars
  • X-rays: binaries
  • X-rays: general

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