Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interferometric Studies of Hot Stars at Sydney University   The University of Sydney has a long history in optical stellar
interferometry. The first project, in the 1960s, was the Narrabri Stellar
Intensity Interferometer, which measured the angular diameters of 32 hot stars
and established the temperature scale for spectral classes O - F. That
instrument was followed by the Sydney University Stellar Interferometer (SUSI),
which is now undergoing a third-generation upgrade, to use the multi-wavelength
PAVO beam combiner. SUSI operates at visible rather than IR wavelengths and has
baselines up to 160 m, so it is well suited to the study of hot stars. A number
of studies have been carried out, and more are planned when commissioning of
the PAVO system is complete. Conversion of the system to allow remote operation
will allow larger scientific projects to be undertaken.

14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an