SIMBAD references

2010ApJ...725.2417S - Astrophys. J., 725, 2417-2425 (2010/December-3)

Dynamical K edge and line variations in the X-ray spectrum of the ultra-compact binary 4U 0614+091.


Abstract (from CDS):

We observed the ultra-compact binary candidate 4U 0614+091 for a total of 200 ks with the high-energy transmission gratings on board the Chandra X-ray Observatory. The source is found at various intensity levels with spectral variations present. X-ray luminosities vary between 2.0x1036 erg/s and 3.5x1036 erg/s. Continuum variations are present at all times and spectra can be fit well with a power-law component, a high kT blackbody component, and a broad line component near oxygen. The spectra require adjustments to the Ne K edge and in some occasions also to the Mg K edge. Once further resolved, the Ne K edge region appears variable in terms of optical depths and morphology. The edge vicinity reveals an average velocity smear of ∼3500 km/s implying a characteristic radius of the order of <109 cm consistent with an ultra-compact binary nature. The variability proves that the excess is intrinsic to the source. The data seem to indicate excess column densities of up to several 1018/cm2. However, there are some serious problems with an Ne I interpretation in ultra-compact disks and we need to consider alternative interpretations, which include a variable O VIII ionization edge, as likely candidates. We test such possibilities with existing observations. The prominent soft emission line complex near the O VIII Lyαposition appears extremely broad and relativistic effects from near the innermost disk have to be included. Gravitationally broadened line fits also provide nearly edge-on angles of inclination consistent with the observed high dynamics near the Ne K edge. The emissions appear consistent with an ionized disk with ionization parameters of the order of 104 at radii of a few 107 cm. The line wavelengths with respect to O VIII Lyα are found variably blueshifted indicating more complex inner disk dynamics.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: individual: 4U 0614+091 - stars: neutron - techniques: spectroscopic - X-rays: stars

CDS comments: EXO 0748+676 is a misprint for EXO 0748-676.

Simbad objects: 10

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