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.

D'AI' A, DI SALVO T, IARIA R, LAVAGETTO G, ROBBA N R, BURDERI L, et al. (2005). High resolution Spectroscopy of 4U 1728-34 from a Simultaneous Chandra-RXTE Observation.. In AIP Conference Proceedings (pp. 545-548). Eds. L. Burderi et al..

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

D'AI', Antonino;DI SALVO, Tiziana;IARIA, Rosario;LAVAGETTO, Giuseppe;ROBBA, Natale;
2005-01-01

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.
2005
D'AI' A, DI SALVO T, IARIA R, LAVAGETTO G, ROBBA N R, BURDERI L, et al. (2005). High resolution Spectroscopy of 4U 1728-34 from a Simultaneous Chandra-RXTE Observation.. In AIP Conference Proceedings (pp. 545-548). Eds. L. Burderi et al..
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/7553
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