Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...520..292k&link_type=abstract
The Astrophysical Journal, Volume 520, Issue 1, pp. 292-297.
Astronomy and Astrophysics
Astronomy
3
Accretion, Accretion Disks, Stars: Binaries: Close, Stars: Individual (Xb 1916-053), X-Rays: Stars
Scientific paper
We present the results of timing and spectral studies of the dipping X-ray source XB 1916-053, observed by ASCA during its performance verification phase. The detected dipping activity is consistent with previous observations, with a period of 3008 s and an intermittent secondary dip observed roughly 0.4 out of phase with the primary dip. The energy spectra of different intensity states are fitted with a power law with partial covering fraction absorption and interstellar absorption. The increase in the hardness ratio during the primary and secondary dips, and the increase in the covering fraction and column density with decreasing X-ray intensity, all imply that the dipping is caused by the photoabsorbing materials that have been suggested to be where the accreted flow hits the outer edge of the disk materials. The spectra at all intensity levels show no apparent evidence for Fe or Ne emission lines. This may be due to the low metal abundance in the accretion flow. Alternatively, the X-ray luminosity of the central source may be too weak to excite emission lines, which are assumed to be produced by X-ray photoionization of the disk materials.
Ko Yuan-Kuen
Mukai Koji
Smale Alan P.
White Nick E.
No associations
LandOfFree
ASCA Observation of the Dipping X-Ray Source XB 1916-053 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with ASCA Observation of the Dipping X-Ray Source XB 1916-053, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ASCA Observation of the Dipping X-Ray Source XB 1916-053 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1619819