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

Tiziana Di Salvo, Antonino D'Ai', Rosario Iaria, Van Der Klis, Burderi, Lewin, Stella, Méndez, Giuseppe Lavagetto

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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 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.
Lingua originaleEnglish
pagine (da-a)817-822
Numero di pagine6
RivistaASTRONOMY & ASTROPHYSICS
Volume448
Stato di pubblicazionePublished - 2006

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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