Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Searching for new solar twins: The Inti survey for the Northern Sky   Solar twins are key in different areas of astrophysics, however only just
over a hundred were identified and well-studied in the last two decades. In
this work, we take advantage of the very precise \textit{Gaia} (DR2/EDR3),
Tycho and 2MASS photometric systems to create the Inti survey of new solar
twins in the Northern Hemisphere. The spectra of our targets were initially
obtained with spectrographs of moderate resolution (ARCES and Goodman
spectrographs with $R$ = 31500 and 11930, respectively) to find the best solar
twin candidates and then observed at McDonald Observatory with higher resolving
power (TS23, $R$ = 60000) and signal-to-noise ratio (SNR $\sim$ 300-500). The
stellar parameters were estimated through the differential spectroscopic
equilibrium relative to the Sun, which allow us to achieve a high internal
precision ($\sigma(T_{\rm{eff}})$ = 15 K, $\sigma(\log g)$ = 0.03 dex,
$\sigma$([Fe/H]) = 0.01 dex, and $\sigma(v_{t})$ = 0.03 km s$^{-1}$). We
propose a new class of stars with evolution similar to the Sun: \textit{solar
proxy}, which is useful to perform studies related to the evolution of the Sun,
such as its rotational and magnetic evolution. Its definition is based on
metallicity ($-$0.15 dex $\leq$ [Fe/H] $\leq$ +0.15 dex) and mass (0.95
M$_{\odot}$ $\leq$ M $\leq$ 1.05 M$_{\odot}$) constraints, thus assuring that
the star follows a similar evolutionary path as the Sun along the main
sequence. Based on this new definition, we report 70 newly identified solar
proxies, 46 solar analogs and 13 solar-type stars. In addition, we identified 9
\textit{close solar twins} whose stellar parameters are the most similar to
those of the Sun.

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The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
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The categories of this paper are: cmp-lg