A study of the low-mass X-ray binary dip sources XB 1916-053, XB 1323-619, X 1624-490 and 4U 1746-371 observed with INTEGRAL

Abstract

We detect dipping activity/modulations in the light curve of the four LMXBs in the 3--10 keV and 20--40 keV energy ranges. The spectral parameters derived from the fits to the INTEGRAL data are consistent with hot coronal structures in these systems where we find a range of plasma temperatures 3.0--224.9 keV. The unabsorbed X-ray to soft Gamma-ray flux between 4--200 keV are 5.9$\times 10^{-10}$ erg s${}^{-1}$ cm${}^{-2}$ for XB 1916-053, 3.3$\times 10^{-10}$ erg s${}^{-1}$ cm${}^{-2}$ for XB 1323-619, 21.6$\times 10^{-10}$ erg s${}^{-1}$ cm${}^{-2}$ for X 1624-490 and 11.0$\times 10^{-10}$ erg s${}^{-1}$ cm${}^{-2}$ for 4U 1746-371. The optical depth to Compton scattering, $\tau$, varies in a range 4.4--0.002 consistent with electron densities $n_e$ $<$ 1.4$\times 10^{15}$ cm${}^{-3}$. In general, we find no significant difference in the dip and non-dip spectra in the ISGRI energy range (above 20 keV) for all the four sources. We only detect absorption differences between dipping and non-dipping intervals for XB 1916-053 and X 1624-490 in the JEM-X energy range. Fits in the 4--200 keV range including an additional photo-ionized absorber model for the two sources show that XB 1916-053 has the highest ionized absorber amoung the two.

27 pages, 7 figures, 4 tables, accepted as it stands in the Astronomical Journal

References in corpus (4)

• A new Comptonization model for low-magnetized accreting neutron stars in low mass X-ray binaries
• Variations in the dip properties of the low-mass X-ray binary XB 1254-69 observed with XMM-Newton and INTEGRAL
• Chandra Observation of the Big Dipper X 1624-490
• Detection of Highly Ionized Metal Absorption Lines in the Ultracompact X-ray Dipper 4U 1916-05

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• X-ray Spectroscopy of the High Mass X-ray Binary Pulsar Centaurus X-3 over its Binary Orbit
• An Extended and More Sensitive Search for Periodicities in RXTE/ASM X-ray Light Curves
• Eclipses During the 2010 Eruption of the Recurrent Nova U Scorpii
• Constraining Progenitors of Observed LMXBs Using CARB Magnetic Braking
• Frequency Resolved Spectroscopy of XB 1323-619 Using XMM-Newton data: Detection of a Reflection Region in the Disk