Chandra Observation of the Dipping Source XB 1254-690

Abstract

We present the results of a 53 ks long Chandra observation of the dipping source XB 1254--690. During the observation neither bursts or dips were observed. From the zero-order image we estimated the precise X-ray coordinates of the source with a 90% uncertainty of 0.6\arcsec. Since the lightcurve did not show any significant variability, we extracted the spectrum corresponding to the whole observation. We confirmed the presence of the \ion{Fe}{xxvi} K${}_{\alpha }$ absorption lines with a larger accuracy with respect to the previous XMM EPIC pn observation. Assuming that the line width were due to a bulk motion or a turbulence associated to the coronal activity, we estimate that the lines were produced in a photoionized absorber between the coronal radius and the outer edge of the accretion disk.

arXiv comment8 pages, 10 figs, accepted by A&A on 6 December 2006

References in corpus (11)

• Atomic Data for Permitted Resonance Lines of Atoms and Ions from H to Si, and S, Ar, Ca and Fe
• High resolution Chandra HETG and RXTE observations of GRS 1915+105 : A hot disk atmosphere & cold gas enriched in Iron and Silicon
• The Chandra HETGS and RXTE view of GRS 1915+105
• Erratum: ASCA Observations of the Absorption-Line Features from the Super-Luminal Jet Source GRS 1915+105
• Resolving the Composite Fe K-alpha Emission Line in the Galactic Black Hole Cygnus X-1 with Chandra
• A highly-ionized absorber in the X-ray binary 4U 1323-62: a new explanation for the dipping phenomenon
• Measurements of accretion disc corona size in LMXB: consequences for Comptonization and LMXB models
• Discovery of X-ray absorption features from the dipping low-mass X-ray binary XB 1916-053 with XMM-Newton
• Discovery of narrow X-ray absorption features from the low-mass X-ray binary X 1254-690 with XMM-Newton
• A Cessation of X-ray Dipping Activity in X1254-690
• A Hard Tail in the Broad Band Spectrum of the Dipper XB 1254-690

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• XMM-Newton observations of GX 13+1: correlation between photoionised absorption and broad line emission
• Variations in the dip properties of the low-mass X-ray binary XB 1254-69 observed with XMM-Newton and INTEGRAL
• Discovery of periodic dips in the light curve of GX 13+1: the X-ray orbital ephemeris of the source
• A catalogue of unusually long thermonuclear bursts on neutron stars
• The origin of the tilted disk in the low mass X-ray binary GR Mus (XB 1254-690)
• Evidence of a non-conservative mass transfer in the ultra-compact X-ray source XB 1916-053
• Accretion disc winds in X-ray binaries
• Updating the orbital ephemeris of the dipping source XB 1254-690 and the distance to the source
• Timing and spectral study of XB 1254-690 using new RXTE PCA data
• Spectral study of neutron star low mass X-ray binary source 1A 1744-361