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

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

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Abstract

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
Pagine545-548
Numero di pagine4
Stato di pubblicazionePublished - 2005

Serie di pubblicazioni

NomeAIP CONFERENCE PROCEEDINGS

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

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