Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical flares from the faint mid-dM star 2MASS J00453911+4140396   We present $B$ and $V$ light curves of a large stellar flare obtained with
the Wide Field Camera at the Isaac Newton 2.5-m telescope (La Palma). The
source object is a faint ($m_V=21.38$) foreground star in the field of the
Andromeda galaxy, with its most probable spectral type being dM4. We provide an
estimate of the total flare energy in the optical range and find it to be of
the order of $10^{35}$ erg. The cooling phase of the large flare shows three
additional weak flare-like events, which we interpret as results of a
triggering mechanism also observed on the Sun during large coronal mass
ejections.

26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
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The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys