Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Survey for Distant Solar Twins (SDST) -- I. EPIC method for stellar
  parameter measurement   Solar twins are stars of key importance to the field of astronomy and offer a
multitude of science applications. Only a small number ($\lesssim200$) of solar
twins are known today, all of which are relatively close to our Sun
($\lesssim800\,pc$). The goal of our Survey for Distant Solar Twins (SDST) is
to identify many more solar twin and solar analogue stars out to much larger
distances ($\sim4\,kpc$). In this paper, we present a new method to identify
solar twins using relatively low $S/N$, medium resolving power ($R\sim
28{,}000$) spectra that will be typical of such distant targets observed with
HERMES on the $3.9\,m$ Anglo-Australian Telescope (AAT). We developed a novel
approach, namely EPIC, to measure stellar parameters which we use to identify
stars similar to our Sun. EPIC determines the stellar atmospheric parameters
(effective temperature $T_{\mathrm{eff}}$, surface gravity $\log g$ and
metallicity [Fe/H]) using differential equivalent width (EW) measurements of
selected spectroscopic absorption features and a simple model, trained on
previously analysed spectra, that connects these EWs to the stellar parameters.
The reference for the EW measurements is a high $S/N$ solar spectrum which is
used to minimise several systematic effects. EPIC is fast, optimised for
Sun-like stars and yields stellar parameter measurements with small enough
uncertainties to enable spectroscopic identification of solar twin and analogue
stars up to $\sim4\,kpc$ away using AAT/HERMES, i.e.\
$\sigma\left(T_{\mathrm{eff}}, \log g, \textrm{[Fe/H]}\right) = \left(50\,K,
0.08\,dex, 0.03\,dex\right)$ on average at $S/N=25$.

31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn