Artículo
Searching for new solar twins: The Inti survey for the Northern Sky
Yana Galarza, Jhon; López Valdivia, Ricardo; Lorenzo Oliveira, Diego; Reggiani, Henrique; Meléndez, Jorge; Gamarra Sánchez, Daniel; Flores Trivigno, Matias Gaston
; Portal Rivera, Jerry; Miquelarena Hollger, Paula Andrea
; Ponte, Geisa; Schlaufman, Kevin C.; Vargas Auccalla, Teófilo
Fecha de publicación:
04/2021
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Monthly Notices of the Royal Astronomical Society
ISSN:
0035-8711
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
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 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 = 31 500 and 11 930, respectively) to find the best solar twin candidates and then observed at McDonald Observatory with higher resolving power (TS23, R = 60 000) 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 (σ(Teff) = 15 K, σ(log g) = 0.03 dex, σ([Fe/H]) = 0.01 dex, and σ(vt) = 0.03 km s-1). We propose a new class of stars with evolution similar to the Sun: 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 ≤ [Fe/H] ≤ + 0.15 dex) and mass (0.95 M⊙ ≤ M ≤ 1.05 M⊙) 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 analogues, and 13 solar-type stars. In addition, we identified nine close solar twins whose stellar parameters are the most similar to those of the Sun.
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Articulos(ICATE)
Articulos de INST.D/CS ASTRONOMICAS D/LA TIERRA Y DEL ESPACIO
Articulos de INST.D/CS ASTRONOMICAS D/LA TIERRA Y DEL ESPACIO
Citación
Yana Galarza, Jhon; López Valdivia, Ricardo; Lorenzo Oliveira, Diego; Reggiani, Henrique; Meléndez, Jorge; et al.; Searching for new solar twins: The Inti survey for the Northern Sky; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 504; 2; 4-2021; 1873-1887
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