منابع مشابه
Sidebands Due to Quasi-periodic Oscillations in 4u 1626−67
The low-mass X-ray binary pulsar 4U 1626−67 shows 0.048 Hz quasi-periodic oscillations (QPOs) and red noise variability as well as coherent pulsations at the 0.130 Hz neutron star spin frequency. Power density spectra of observations made with the Rossi X-ray Timing Explorer show significant sidebands separated from the pulsar spin frequency (and its harmonics) by the QPO frequency. These show ...
متن کاملMillihertz Optical/uv Oscillations in 4u 1626–67: Evidence for a Warped Accretion Disk1
We have detected large-amplitude 0.3–1.2 mHz quasi-periodic oscillations (QPOs) from the low-mass X-ray binary pulsar 4U 1626–67/KZ TrA, using ultraviolet photometry from the Hubble Space Telescope and groundbased optical photometry. These 1 mHz QPOs, which have coherence (ν/∆ν) ≈ 8, are entirely distinct from the 130 mHz pulsar spin frequency, a previously known 48 mHz QPO, and the 42 min bina...
متن کاملThe Uv Spectrum of the Ultra-compact X-ray Binary– 4u 1626-67
We have obtained Hubble Space Telescope/STIS low-resolution ultraviolet spectra of the Xray pulsar 4U1626-67 (=KZ TrA); 4U 1626-67 is unusual even among X-ray pulsars due to its ultra-short binary period (P=41.4 min) and remarkably low mass-function (≤ 1.3 × 10 M⊙). The far-UV spectrum was exposed for a total of 32ks and has sufficient signal-to-noise to reveal numerous broad emission and promi...
متن کاملDouble-peaked X-ray Lines from the Oxygen/neon-rich Accretion Disk in 4u 1626−67 Norbert S. Schulz, Deepto Chakrabarty, Herman L. Marshall, Claude
We report on a 39 ks observation of the 7.7-s low-mass X-ray binary pulsar 4U 1626−67 with the High Energy Transmission Grating Spectrometer (HETGS) on the Chandra X-Ray Observatory. This ultracompact system consists of a disk-accreting magnetic neutron star and a very low mass, hydrogen-depleted companion in a 42-min binary. We have resolved the previously reported Ne/O emission line complex n...
متن کاملar X iv : a st ro - p h / 97 07 10 5 v 1 9 J ul 1 99 7 Correlation Between Luminosity
We present X-ray light curves and energy spectra for the persistent accreting pulsars 4U 1626–67 and GX 301-2 measured by the All-Sky Monitor (ASM) on Ginga from 1987 March – 1991 October. We compare these with simultaneous and near simultaneous measurements of spin frequency and flux by other instruments, principally the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Ob...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1980
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/190.1.33p