Discovery of Nearly Coherent Oscillations with a Frequency of ~567 Hz during Type-I X-ray Bursts of the X-ray Transient and Eclipsing Binary X 1658--298

Details Discovery of Nearly Coherent Oscillations with a Frequency of ~567 Hz during Type-I X-ray Bursts of the X-ray Transient and Eclipsing Binary X 1658--298 Discovery of Nearly Coherent Oscillations with a Frequency of ~567 Hz during Type-I X-ray Bursts of the X-ray Transient and Eclipsing Binary X 1658--298

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.4408w&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #44.08; Bulletin of the American Astronomical Society, Vol. 32, p.1652

Astronomy and Astrophysics

Astrophysics

Scientific paper

We report the discovery of nearly coherent oscillations with a frequency of ~567 Hz during type-I X-ray bursts from the X-ray transient and eclipsing binary X 1658--298. If these oscillations are directly related to the neutron star rotation then the spin period of the neutron star in X 1658--298 is ~1.8 ms. The oscillations can be present during the rise or decay phase of the bursts. Oscillations during the decay phase of the bursts show an increase in the frequency of ~0.5 to 1 Hz, however, in one particular burst the oscillations reappear at the end of the decay phase at about 571.5 Hz. This represents an increase in oscillation frequency of about 5 Hz which is the largest frequency change seen so far in a burst oscillation. It is unclear if such a large change can be accommodated by present models used to explain the frequency evolution of the oscillations. Most bursts which happened during periods of X-ray dipping behavior showed weak or no oscillations, strongly suggesting that the X-ray dipping decreases the amplitude of the oscillations. This work was supported by NASA through the Chandra Postdoctoral Fellowship grant number PF9-10010 awarded by CXC, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-39073.

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