Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spots and flares in hot main sequence stars   About 22000 Kepler stars and nearly 60000 TESS stars from sectors 1-24 have
been classified according to variability type. A large proportion of stars of
all spectral types appear to have periods consistent with the expected rotation
periods. A previous analysis of A and late B stars strongly suggests that these
stars are indeed rotational variables. In this paper we have accumulated
sufficient data to show that rotational modulation is present even among the
early B stars. A search for flares in TESS A and B stars resulted in the
detection of 110 flares in 68 stars. The flare energies exceed those of typical
K and M dwarfs by at least two orders of magnitude. These results, together
with severe difficulties of current models to explain stellar pulsations in A
and B stars, suggest a need for revision of our current understanding of the
outer layers of stars with radiative envelopes.

8
The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat