Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19512608f&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #126.08; Bulletin of the American Astronomical Society, Vol. 31, p.1556
Astronomy and Astrophysics
Astronomy
Scientific paper
We have performed in-burst phase connection of the burst pulsations detected in type I X-ray bursts from the low-mass X-ray binaries KS 1731-260 and Aql X-1. The train of pulsations in each of the bursts examined (two from KS 1731-260 and one from Aql X-1) is greater than nine seconds in length and -- accounting for the systematic drift in frequency observed in all cases -- completely coherent for ≳ 5000 cycles. Phase-connecting the pulsations allows us to characterize the frequency drift in a model-independent fashion: we find that the frequency evolution, in each case, is consistent with a τ 3s exponential relaxation to an asymptotic frequency. Exponential fits to the frequency evolution during the two bursts from KS 1731-260, although different in specific details, are remarkably similar; in particular, the stability of the asymptotic pulse frequency over the 2.6 year interval between the bursts sets a 2σ upper limit of |˙ {P}| < 3e-14 on the time-average period derivative for these oscillations. We suggest that our results further support the interpretation of the burst pulsations as reflecting the neutron star spin period in these systems.
Fox Derek W.
Morgan Edward Harrington
Muno Michael P.
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