6533b82bfe1ef96bd128e198
RESEARCH PRODUCT
High Resolution Spectroscopy of 4U 1728-34 from a Simultaneous Chandra-RXTE Observation
M. Van Der KlisMariano MéndezG. LavagettoN. R. RobbaT. Di SalvoAntonino D'aiLuciano BurderiR. Iariasubject
PhysicsAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)Continuum (design consultancy)X-ray binaries X-ray sources X-ray bursts Spectroscopy and spectrophotometry X-rayFOS: Physical sciencesHigh resolutionAstrophysicsAstrophysicsFull width at half maximumBlack-body radiationEmission spectrumAbsorption (electromagnetic radiation)SpectroscopyLine (formation)description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2004-11-10 |