Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002stin...0266781k&link_type=abstract
Technical Report, Smithsonian Astrophysical Observatory Cambridge, MA United States
Astronomy and Astrophysics
Astrophysics
Neutron Stars, X Ray Binaries, X Ray Timing Explorer, Astrophysics, Spectrum Analysis, Energy Bands, High Frequencies, Broadband
Scientific paper
The primary goal of this proposal was to increase our understanding of the accretion dynamics and emission mechanisms in neutron-star low-mass x-ray binaries via accurate measurements of their broad-band x-ray spectrum with particular emphasis on the hard x-ray emission. We obtained an extensive set of Rossi X-Ray Timing Explorer (RXTE) observations of a bright hard x-ray outburst from the source 4U1728-34 including data obtained under this proposal and previously scheduled observations for another observer. We have constructed x-ray light curves in several energy bands, including hard energy bands, from these data. We also completed spectral analysis of several observations which show strong hard x-ray emission. We are currently performing timing analysis to search for possible correlations between the spectral and timing evolution of 4U1728-34. Due to the one-year delay in obtaining the observations made for the other observer (which are the ones containing the peak of the hard X-ray emission), the analysis for this project is not yet complete. Because 4U1728-34 shows interesting high-frequency timing behavior, we plan to complete the analysis as part of our on-going investigation of high-frequency timing of X-ray binaries.
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