Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: PHASES Differential Astrometry and the Mutual Inclination of the V819
  Herculis Triple Star System   V819 Herculis is a well-studied triple star system consisting of a ``wide''
pair with 5.5 year period, one component of which is a 2.2-day period eclipsing
single-line spectroscopic binary. Differential astrometry measurements from the
Palomar High-precision Astrometric Search for Exoplanet Systems (PHASES) are
presented and used to determine a relative inclination between the short- and
long-period orbits of 23.6 +- 4.9 degrees. This represents only the sixth
unambiguous determination of the mutual inclination of orbits in a hierarchical
triple system. This result is combined with those for the other five systems
for analysis of the observed distribution of mutual inclinations in nearby
triple systems. It is found that this distribution is different than that which
one would expect from random orientations with statistical significance at the
94% level; implications for studying the spatial distribution of angular
momentum in star forming regions is discussed.

1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg