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Letter to the Editor
Detection of a broad iron emission line and sub-millisecond quasiperiodic oscillations from the type I X-ray burster 4U 1728-34 in a high state
Received 25 May 2000 / Accepted 24 July 2000
We report results from simultaneous RossiXTE and BeppoSAX observations of the neutron-star x-ray binary and type I X-ray burster 4U 1728-34. The source was found in a high luminosity state, , and quasiperiodic oscillations were detected at Hz, the highest frequency ever observed from this source. The x-ray spectrum shows a broad, keV, iron fluorescence line. We discuss interpretations of the broad line and the quasiperiodic oscillations and how future simultaneous spectral and timing observations can be used to test these interpretations and, potentially, to estimate the mass of the compact object.
Key words: accretion, accretion disks stars: individual: stars: neutron X-rays: stars
Send offprint requests to: Philip Kaaret (firstname.lastname@example.org)
Online publication: August 23, 2000