Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for accretion rate change during type I X-ray bursts   The standard approach for time-resolved X-ray spectral analysis of
thermonuclear bursts involves subtraction of the pre-burst emission as
background. This approach implicitly assumes that the persistent flux remains
constant throughout the burst. We reanalyzed 332 photospheric radius expansion
bursts observed from 40 sources by the Rossi X-ray Timing Explorer, introducing
a multiplicative factor $f_a$ to the persistent emission contribution in our
spectral fits. We found that for the majority of spectra the best-fit value of
$f_a$ is significantly greater than 1, suggesting that the persistent emission
typically increases during a burst. Elevated $f_a$ values were not found solely
during the radius expansion interval of the burst, but were also measured in
the cooling tail. The modified model results in a lower average value of the
$\chi^2$ fit statistic, indicating superior spectral fits, but not yet to the
level of formal statistical consistency for all the spectra.
  We interpret the elevated $f_a$ values as an increase of the mass accretion
rate onto the neutron star during the burst, likely arising from the effects of
Poynting-Robertson drag on the disk material. We measured an inverse
correlation of $f_a$ with the persistent flux, consistent with theoretical
models of the disc response. We suggest that this modified approach may provide
more accurate burst spectral parameters, as well as offering a probe of the
accretion disk structure.

17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
18
The categories of this paper are: econ