Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The FUor star V2493 Cyg (HBC 722) -- eleven years at maximum brightness   At the time of stellar evolution, young stellar objects go through processes
of increased activity and instability. Star formation takes place in several
stages during which the star accumulates enough mass to initiate thermonuclear
reactions in the nucleus. A significant percentage of the mass of Sun-like
stars accumulates during periods of increased accretion known as FUor
outbursts. Since we know only about two dozen stars of this type, the study of
each new object is very important for our knowledge. In this paper, we present
data from photometric monitoring on a FUor object V2493 Cyg discovered in 2010.
Our data were obtained in the optical region with BVRI Johnson-Cousins set of
filters during the period from November 2016 to February 2021. The results of
our observations show that during this period no significant changes in the
brightness of the star were registered. We only detect variations with a small
amplitude around the maximum brightness value. Thus, since 2013 V2493 Cyg
remains at its maximum brightness, without a decrease in brightness. Such
photometric behavior is not typical of other stars from FUor type. Usually the
light curves of FUors are asymmetrical, with a very rapid rise and gradual
decline of the brightness. V2493 Cyg remains unique in this respect with a very
rapid rise in brightness and prolonged retention in maximum light. Our period
analysis made for the interval February 2013 - February 2021 reveals a
well-defined period of 914+/-10 days. Such periodicity can be explained by dust
structures remaining from star formation in orbit around the star.

28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin