High resolution Spectroscopy of 4U 1728-34 from a Simultaneous Chandra-RXTE Observation.

Natale Robba, Antonino D'Ai', Tiziana Di Salvo, Rosario Iaria, Van Der Klis, Burderi, Mendez, Giuseppe Lavagetto

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We report on a simultaneous Chandra and RossiXTE observation of the LMXB atoll bursting source 4U 1728-34 performed on 2002 March 3-5. We fitted the 1.2-35 keV continuum spectrum with a blackbody plus a Comptonized component. An overabundance of Si by a factor of ~2 with respect to Solar abundance is required for a satisfactory fit. Large residuals at 6-10 keV can be fitted by a broad (FWHM ~ 1.6 keV) Gaussian emission line, or, alternatively, by absorption edges associated with Fe I and Fe XXV at ~7.1 keV and ~9 keV, respectively. In this interpretation, we find no evidence of a broad, or narrow Fe Kalpha line, between 6 and 7 keV. We tested our alternative modeling of the iron Kalpha region by reanalyzing a previous BeppoSAX observation of 4U 1728-34, finding a general agreement with our new spectral model.
Lingua originaleEnglish
Titolo della pubblicazione ospiteAIP Conference Proceedings
Numero di pagine4
Stato di pubblicazionePublished - 2005

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All Science Journal Classification (ASJC) codes

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  • ???subjectarea.asjc.2300.2303???
  • ???subjectarea.asjc.1100.1110???
  • ???subjectarea.asjc.3100.3100???
  • ???subjectarea.asjc.2300.2309???


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