Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The first study of the light-travel time effect in bright eclipsing
  binaries in the Small Magellanic Cloud   The first 100 brightest eclipsing systems from the Small Magellanic Cloud
were studied for their period changes. The photometric data from the surveys
OGLE-II, OGLE-III, OGLE-IV and MACHO were combined with our new CCD
observations obtained using the Danish 1.54-m telescope (La Silla, Chile).
Besides the period changes the light curves were also analysed using the
program PHOEBE, which provided the physical parameters of both eclipsing
components. For 14 of these systems the additional bodies were found, having
the orbital periods from 2 to 20 yr and the eccentricities were found to be up
to 0.9. Amongst the sample of studied 100 brightest systems, we discussed the
number of systems with particular period changes. About 10 per cent of these
stars show eccentric orbit, about the same numbers have third bodies and about
the same show the asymmetric light curves.

35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat