Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Pre-cataclysmic Binary HS 1136+6646 May Have a Companion   Because of the similarity of the primary star of HS 1136+6646 to the
planetary nebula central star BE Ursae Majoris, we did wide field imaging of
the former with an H-alpha filter. No nebulosity was detected. On the other
hand, the point spread function of the star appeared extended. A
partially-resolved red component is detected in the image with the five-band
Sloan Digital Sky Survey. Most importantly, a companion is easily resolved in
the HST acquisition image for the published STIS observation. A companion to
the pre-cataclysmic binary is present at a separation of 1.349'' at position
angle 54.4 deg. Evidence indicates that it is likely of K spectral type. We
cannot demonstrate conclusively that this component has common proper motion
with the close binary. However, the similar apparent z magnitudes and spectral
types of HS 1136+6646B and the resolved component make it likely that we have
in reality a hierarchial triple system. In any case, the presence of this
component needs to be taken into account in future ground-based studies.

32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph