Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: EU Del: exploring the onset of pulsation-driven winds in giant stars   We explore the wind-driving mechanism of giant stars through the nearby (117
pc), intermediate-luminosity ($L \approx 1600$ L$_\odot$) star EU Del (HIP
101810, HD 196610). APEX observations of the CO (3--2) and (2--1) transitions
are used to derive a wind velocity of 9.51 $\pm$ 0.02 km s$^{-1}$, a
$^{12}$C/$^{13}$C ratio of 14 $^{+9}_{-4}$, and a mass-loss rate of a few
$\times$ 10$^{-8}$ M$_\odot$ yr$^{-1}$. From published spectra, we estimate
that the star has a metallicity of [Fe/H] = --0.27 $\pm$ $\sim$0.30 dex. The
star's dusty envelope lacks a clear 10-$\mu$m silicate feature, despite the
star's oxygen-rich nature. Radiative transfer modelling cannot fit a wind
acceleration model which relies solely on radiation pressure on condensing
dust. We compare our results to VY Leo (HIP 53449), a star with similar
temperature and luminosity, but different pulsation properties. We suggest the
much stronger mass loss from EU Del may be driven by long-period stellar
pulsations, due to its potentially lower mass. We explore the implications for
the mass-loss rate and wind velocities of other stars.

28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat