Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: White Dwarf - Red Dwarf Systems Resolved with the Hubble Space
  Telescope: I. First Results   First results are presented for a Hubble Space Telescope Advanced Camera for
Surveys snapshot study of white dwarfs with likely red dwarf companions. Of 48
targets observed and analyzed so far, 27 are totally or partially resolved into
two or more components, while an additional 15 systems are almost certainly
unresolved binaries. These results provide the first direct empirical evidence
for a bimodal distribution of orbital separations among binary systems
containing at least one white dwarf.

27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int