Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A study of the spectral evolution during dipping in XB 1323-619 with
  Rossi-XTE and BeppoSAX   We report results from analysis of the observations of the dipping low mass
X-ray binary XB 1323-619 made with BeppoSAX} and Rossi-XTE. The dust-scattered
halo contributes significantly in this source, and the observation made with
BeppoSAX on 1997 August was used to provide MECS radial intensity profiles at
several energies. From these, the halo fractions were obtained and thus an
optical depth to dust scattering of 1.8 +/- 0.4 derived. In the Rossi-XTE
observation of April 25-28, 1997, seven X-rays dips were observed together with
7 bursts repeating approximately periodically. Non-dip and dip PCA spectra can
be well-described by assuming the emission consists of point-like blackbody
emission identified with the neutron star, plus Comptonized emission from an
extended ADC. The blackbody temperature is 1.79 +/- 0.21 keV and the cut-off
power law photon index 1.61 +/- 0.04. Spectral evolution in dipping is well
described by progressive covering of the extended Comptonizing region by
absorber plus more rapid removal of the point-like blackbody. The effects of
dust scattering and of the X-ray pulsar 1SAX J1324.4-6200 also in the field of
view are included in the fitting. We detect an iron line at ~6.4 keV and its
probable origin in the ADC is discussed.

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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an