Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Temperature of Nonspherical Circumstellar Dust Grains   The temperatures of prolate and oblate spheroidal dust grains in the
envelopes of stars of various spectral types are calculated. Homogeneous
particles with aspect ratios {\small $a/b \le 10$} composed of amorphous
carbon, iron, dirty ice, various silicates, and other materials are considered.
The temperatures of spherical and spheroidal particles were found to vary
similarly with particle size, distance to the star, and stellar temperature.
The temperature ratio {\small $T_{\rm d}({\rm spheroid})/T_{\rm d}({\rm
sphere}) $} depends most strongly on the grain chemical composition and shape.
Spheroidal grains are generally colder than spherical particles of the same
volume; only iron spheroids can be slightly hotter than iron spheres. At
{\small $a/b \approx 2$}, the temperature differences do not exceed 10 %. If
{\small $a/b \ga 4$}, the temperatures can differ by 30-40 %. For a fixed dust
mass in the medium, the fluxes at wavelengths {\small $\lambda \ga 100 \mkm$}
are higher if the grains are nonspherical, which gives over estimated dust
masses from millimeter observations. The effect of grain shape should also be
taken into account when modeling Galactic-dust emission properties, which are
calculated when searching for fluctuations of the cosmic microwave background
radiation in its Wien wing.

12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat