Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Annual Parallax Distance and Secular Motion of the Water Fountain Source
  IRAS 18286-0959   We report on results of astrometric observations of water vapor masers in the
"water fountain" source IRAS 18286-0959 (I18286) with the VLBI Exploration of
Radio Astrometry (VERA). These observations yielded an annual parallax of IRAS
18286-0959, pi=0.277+/-0.041 mas, corresponding to a heliocentric distance of
D=3.61(+0.63)(-0.47) kpc. The maser feature, whose annual parallax was
measured, showed the absolute proper motion of (mu_alpha, mu_delta)=(-3.2 +/-
0.3, -7.2 +/- 0.2) [mas/yr]. The intrinsic motion of the maser feature in the
internal motions of the cluster of features in I18286 does not seem to trace
the motion of the bipolar jet of I18286. Taking into account this intrinsic
motion, the derived motion of the maser feature is roughly equal to that of the
maser source I18286 itself. The proximity of I18286 to the Galactic midplane
(z~10 pc) suggests that the parental star of the water fountain source in
I18286 should be intermediate-mass AGB/post-AGB star, but the origin of a large
deviation of the systemic source motion from that expected from the Galactic
rotation curve is still unclear.

7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas