Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Updated study of the quintuple system V994 Herculis   Aims: We present a new updated study of the unique quintuple system of two
eclipsing binaries, V994 Her. Methods: Based on new obtained photometric
observations, we analysed the period variations of the two eclipsing pairs of
V994 Her. Results: We found that the orbital period of the two eclipsing
binaries around a common barycenter is about 2.9 yrs instead of the original
period, which was reported as 6.3 yrs. Moreover, the system now seems to be
close to coplanar (i ~ 84deg), and we also revised the individual masses of all
four eclipsing components. The two eclipsing pairs show slow apsidal motion
with periods of about 116 and 111 yrs, respectively. Pairs A and B are distant
by about 17 mas on the sky, which is encouraging for observers because an
interferometric detection may be possible in the next years. Conclusions: All
of these results are based on the photometric observations of V994 Her and its
detailed analysis of the period changes of the two eclipsing binaries.

37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph