Progressive Covering of the ADC during Dipping in the LMXB XBT 0748-676

Details Progressive Covering of the ADC during Dipping in the LMXB XBT 0748-676 Progressive Covering of the ADC during Dipping in the LMXB XBT 0748-676

1998-05-05

arxiv.org/abs/astro-ph/9805043v1

to be published in Astrophysical Journal, vol. 504 (September 1st, 1998)

Astronomy and Astrophysics

Astrophysics

7 pages, Latex, 3 eps figures

Scientific paper

We report results of analysis of the ASCA observation of 1993, May 7th of the dipping LMXB source XBT 0748-676, and propose a new explanation of the spectral evolution in dipping in this source. We show that the non-dip and dip spectra in several intensity bands are well fitted using the same physical model that we have previously shown gives good explanations of several dipping sources, consisting of point source blackbody emission from the neutron star, plus extended Comptonised emission from the accretion disk corona (ADC), with progressive covering of the ADC during dipping. Best fit values of kT_bb = 1.99 +/- 0.16 keV and power law photon index Gamma = 1.70 +/- 0.16 are found. The strong excess below 1 keV was well fitted by a Gaussian line at ~0.65 keV. In dipping, good fits were obtained by allowing it to be covered by the same progressive covering factor as the extended continuum emission, providing strong evidence that the line originates in the ADC. By using our two-component model we show that the unabsorbed component is the uncovered fraction of the Comptonised emission, and in the band 1 - 10 keV, we do not need to invoke substantial electron scattering to explain dipping.

Affiliated with

Also associated with

No associations

Rating

Progressive Covering of the ADC during Dipping in the LMXB XBT 0748-676 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 Progressive Covering of the ADC during Dipping in the LMXB XBT 0748-676, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Progressive Covering of the ADC during Dipping in the LMXB XBT 0748-676 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-596685