Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coronal stripping in supersaturated stars   A recent unambiguous detection of X-ray rotational modulation of the
supersaturated star VXR45 (P = 0.223 days) has shown that its corona has
discrete dark and bright X-ray regions. We suggest that due to the rapid
rotation, the X-ray emitting corona has been centrifugally stripped away,
creating open field regions that are dark in X-rays. This leads naturally both
to a significant rotational modulation in X-rays but also to the lower X-ray
luminosity of supersaturated stars compared to those rotating more slowly. To
demonstrate the effect, we take as an example a more slowly rotating star for
which surface magnetograms are available. We extrapolate the potential coronal
magnetic field based on these magnetograms and determine for a hydrostatic,
isothermal atmosphere the structure of the density and of the optically-thin
X-ray emission. We show that if the rotation rate of this star were increased,
the magnitude of the X-ray luminosity would decrease while its rotational
modulation would increase in a way that is consistent with the recent
observations of VXR45.

1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an