Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NSVS 2569022: a peculiar binary among the W UMa stars with extremely
  small mass ratios   Photometric observations of the W UMa binary NSVS 2569022 are presented. The
light curve solution reveals that both components are of F spectral type
(temperatures $T_1$=$T_2$=6100 K). NSVS 254037 undergoes total eclipse of W
subtype and the mass ratio is well-determined. Its exclusive small value of
only 0.077 implies that the target probably goes to instability and possible
merger. This value ranks NSVS 2569022 in sixth place among the binaries with
smallest mass ratio. On the base of empirical relation "period -- total mass"
for low mass-ratio binaries we estimated the global parameters of NSVS 2569022:
masses $M_1$=1.17 M$_{\odot}$ and $M_2$=0.09 M$_{\odot}$; radii $R_1$=1.19
R$_{\odot}$ and $R_2$=0.38 R$_{\odot}$; luminosities $L_1$=1.73 L$_{\odot}$ and
$L_2$=0.17 L$_{\odot}$. An analysis of the characteristics of binaries with
extremely low-mass ratios is made. NSVS 2569022 turns out peculiar binary among
the W UMa stars with extremely small mass ratios due to its unexpected small
fill-out factor of only 0.014 (slightly overcontact configuration).

0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
16
The categories of this paper are: stat
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
1
The categories of this paper are: cs