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

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

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...448..817d&link_type=abstract

Astronomy and Astrophysics, Volume 448, Issue 3, March IV 2006, pp.817-822

Astronomy and Astrophysics

Astrophysics

11

Accretion, Accretion Disks, Stars: Individual: Mxb 1728-34, Stars: Neutron, X-Rays: Stars, X-Rays: Binaries, X-Rays: General

Scientific paper

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.

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