Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VLTI observations of AGB stars   We report on recent observations of AGB stars obtained with the VLT
Interferometer (VLTI). We illustrate in general the potential of
interferometric measurements to study stellar atmospheres and circumstellar
envelopes, and demonstrate in particular the advantages of a coordinated
multi-wavelength approach including near/mid-infrared as well as radio
interferometry. We report on studies of the atmospheric structure of non-Mira
and Mira variable giants. We have used VLTI observations of the near- and
mid-infrared stellar sizes and concurrent VLBA observations of the SiO maser
emission. So far, this project includes studies of the Mira stars S Ori and RR
Aql as well as of the supergiant AH Sco. The results from our first epochs of S
Ori measurements have recently been published and the main results are reviewed
here. The S Ori maser ring is found to lie at a mean distance of approximately
2 stellar radii, a result that is virtually free of the usual uncertainty
inherent in comparing observations of variable stars widely separated in time
and stellar phase. We discuss the status of our more recent S Ori, RR Aql, and
AH Sco observations, and present an outlook on the continuation of our project.

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The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math