On the Amplitude of Burst Oscillations in 4U 1636-54: Evidence for Nuclear Powered Pulsars

Details On the Amplitude of Burst Oscillations in 4U 1636-54: Evidence for Nuclear Powered Pulsars On the Amplitude of Burst Oscillations in 4U 1636-54: Evidence for Nuclear Powered Pulsars

1998-03-10

arxiv.org/abs/astro-ph/9803119v1

Astronomy and Astrophysics

Astrophysics

AASTEX Latex, 13 pages including 5 figures. Accepted for publication in the Astrophysical Journal Letters

Scientific paper

10.1086/311322

We present a study of 581 Hz oscillations observed during a thermonuclear X-ray burst from the low mass X-ray binary (LMXB) 4U 1636-54 with the Rossi X-ray Timing Explorer (RXTE). We argue that the combination of large pulsed amplitudes near burst onset and the spectral evidence for localized emission during the rise strongly supports rotational modulation as the mechanism for the oscillations. We discuss how theoretical interpretation of spin modulation amplitudes, pulse profiles and pulse phase spectroscopy can provide constraints on the masses and radii of neutron stars. We also discuss the implication of these findings for the beat frequency models of kHz X-ray variability in LMXB.

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