Pulsations Detected from Accreting High-Mass X-Ray Binaries at Low Luminosities

Details Pulsations Detected from Accreting High-Mass X-Ray Binaries at Low Luminosities Pulsations Detected from Accreting High-Mass X-Ray Binaries at Low Luminosities

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...658..514r&link_type=abstract

The Astrophysical Journal, Volume 658, Issue 1, pp. 514-519.

Astronomy and Astrophysics

Astronomy

11

Stars: Pulsars: General, Pulsars: Individual (4U 1145-619), Pulsars: Individual (1A 1118-615)

Scientific paper

We report the detection of pulsations from two accreting transient high-mass X-ray binaries (HMXBs) at low X-ray luminosities (~1-4×1034 ergs s-1). While one (4U 1145-619) has been detected pulsing previously at a lower luminosity, the second (1A 1118-615) has not, making it the third such transient HMXB from which pulsations are detected at low luminosity. The pulsars exhibit broadband rms variability (22.3%+/-0.1% and 9.2%+/-0.1%, respectively). While the present observations do not permit measurement of a spin frequency derivative, spin-down is implied in comparison with previous Compton Gamma Ray Observatory/BATSE observations. If spin-down occurred at the presently observed X-ray luminosity of 4U 1145-619, the required mass accretion rate is insufficient to produce the observed X-ray luminosity from a shock at the magnetosphere, and only a fraction of the mass accretion makes its way to the neutron star surface, with most of the mass leaving the system, carrying away angular momentum to affect spin-down.

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