Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997stin...9925563k&link_type=abstract
Technical Report, NASA Goddard Space Flight Center Greenbelt, MD United States
Astronomy and Astrophysics
Astronomy
X Ray Astronomy, X Ray Spectra, X Ray Binaries, Periodic Variations, Emission Spectra, Energy Spectra, Photoionization, Stellar Occultation, Stellar Mass Accretion, Accretion Disks, Light Curve
Scientific paper
We present the results of timing and spectral studies of the dipping X-ray source X1916-053, observed by ASCA during its Performance Verification phase. The detected dipping activity is consistent with previous observations, with a period of 3008s 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 photo-absorbing materials which 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
Makai Koji
Smale Alan P.
White Nick E.
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