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

Details High Resolution Spectroscopy of 4U 1728-34 from a Simultaneous Chandra-RXTE Observation High Resolution Spectroscopy of 4U 1728-34 from a Simultaneous Chandra-RXTE Observation

2004-11-10

arxiv.org/abs/astro-ph/0411270v2

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. To appear in the conference proceedings of `Interacting Binaries: Accretion, Evolution & Outcomes' (Cefalu

Scientific paper

10.1063/1.2130281

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.

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