Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...469l..29z&link_type=abstract
Astrophysical Journal Letters v.469, p.L29
Astronomy and Astrophysics
Astronomy
46
X-Rays: Stars, X-Rays: Bursts, Stars: Neutron, Stars: Individual Alphanumeric: Gro J1744-28, Stars: Pulsars: General, Stars: Binaries: General
Scientific paper
The newly discovered source GRO J1744-28 is remarkable in many respects. It is a low-mass X-ray binary system that shows 2.1 Hz coherent pulsations. It also produces type II X-ray bursts similar to those seen in the Rapid Burster. In this Letter we report results from a series of observations with the Rossi X-Ray Timing Explorer (RXTE) during which GRO J1744-28 showed quasi-periodic X-ray brightness oscillations (QPOs) at 20, 40, and 60 Hz. Their fractional rms amplitudes are 0.19%, 5.9%, and 0.42%, respectively. The QPO centroid frequency and its rms amplitude as a function of source brightness in the band of 2--60 keV indicate that these QPOs are of a different kind from the beat-frequency QPOs that have been observed among Z sources as well as X-ray pulsars. We discuss possible interpretations of these QPOs in the context of neutron star g-mode oscillations and photon bubble oscillations.
Jahoda Keith
Jernigan Glenn G.
Klein Richard I.
Morgan Edward Harrington
Strohmayer Tod E.
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