6533b836fe1ef96bd12a0993
RESEARCH PRODUCT
Chandra observation of the Big Dipper X 1624–490
N. R. RobbaR. IariaG. LavagettoT. Di SalvoAntonino D'aisubject
Physicsstars : individual : X 1624-490Absorption spectroscopyAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsRadiusAstrophysicsAstrophysicsaccretion accretion diskstars : neutronBulk motionSpectral lineIonAccretion discSpace and Planetary ScienceX-rays : starX-rays : binarieindividual : X 1624-490; stars : neutron; X-rays : stars; X-rays : binaries; X-rays : general [accretion accretion disks; stars]X-rays : generalLine (formation)description
We present the results of a 73 ks long Chandra observation of the dipping source X 1624-490. During the observation a complex dip lasting 4 hours is observed. We analyse the persistent emission detecting, for the first time in the 1st-order spectra of X 1624-490, an absorption line associated to \ion{Ca}{xx}. We confirm the presence of the \ion{Fe}{xxv} K$_\alpha$ and \ion{Fe}{xxvi} K$_\alpha$ absorption lines with a larger accuracy with respect to a previous XMM observation. Assuming that the line widths are due to a bulk motion or a turbulence associated to the coronal activity, we estimate that the lines have been produced in a photoionized absorber between the coronal radius and the outer edge of the accretion disk.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2006-12-11 | Astronomy & Astrophysics |