Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A wall of dust around a proto-Mira   We present the discovery of a huge (19$\arcmin$ $\times$ 16$\arcmin$) dust
ring surrounding a bright (V = 10.60) red star. The dust ring has, at D = 700
pc, a diameter of 4 pc, and a central hole of ~1.5 pc across. Part of the shell
is also seen as an absorption nebulosity. The star is classified as a M3III AGB
star. Among AGB stars its detached shell is of unrivalled size. Detached shells
around AGB stars are normally interpreted in terms of thermal pulses. However,
in this case a significant fraction of the shell may consist of swept-up ISM;
the detached appearance can be explained with wind--ISM interaction. We present
a model where the AGB wind has been stopped by the surrounding ISM, and the
swept-up shell is now expanding at the sound speed. The model predicts that the
ring will disperse over a few times 10^5 yr, and eventually will leave a large
hole in the ISM surrounding the AGB star or its future planetary nebula.

26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex