Searching for new solar twins: The Inti survey for the Northern Sky
J. Y. Galarza, R. L\'opez-Valdivia, D. Lorenzo-Oliveira, H. Reggiani,, J. Mel\'endez, D. Gamarra-S\'anchez, M. Flores, J. Portal-Rivera, P., Miquelarena, G. Ponte, K. C. Schlaufman, T. V. Auccalla

TL;DR
This study uses Gaia and other photometric data to identify new solar twins and proxies in the Northern Hemisphere, providing a valuable resource for solar and stellar evolution research.
Contribution
The paper introduces a new classification of solar proxies and reports 70 new solar proxies, 46 analogs, and 13 solar-type stars, expanding the known sample of solar-like stars.
Findings
Identified 70 new solar proxies.
Discovered 46 solar analogs.
Found 13 solar-type stars and 9 close solar twins.
Abstract
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 = 31500 and 11930, respectively) to find the best solar twin candidates and then observed at McDonald Observatory with higher resolving power (TS23, = 60000) and signal-to-noise ratio (SNR 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 ( = 15 K, = 0.03…
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