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Searching for new solar twins: The Inti survey for the Northern Sky
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-04-08 , DOI: 10.1093/mnras/stab987
Jhon Yana Galarza 1 , Ricardo López-Valdivia 2 , Diego Lorenzo-Oliveira 1 , Henrique Reggiani 3 , Jorge Meléndez 1 , Daniel Gamarra-Sánchez 4 , Matias Flores 5, 6, 7 , Jerry Portal-Rivera 4 , Paula Miquelarena 5, 6, 7 , Geisa Ponte 1, 8 , Kevin C Schlaufman 3 , Teófilo Vargas Auccalla 4
Affiliation  

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($\rm {[Fe/H]}$) = 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 ≤ $\rm {[Fe/H]}$ ≤ + 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.

中文翻译:

寻找新的太阳双胞胎:Inti 对北方天空的调查

太阳双胞胎是天体物理学不同领域的关键,但在过去的二十年中,只有一百多个被确定并得到充分研究。在这项工作中,我们利用非常精确的 Gaia (DR2/EDR3)、Tycho 和 2MASS 光度系统来创建对北半球新太阳双胞胎的 ${{Inti}}$ 调查。我们目标的光谱最初是通过中等分辨率的光谱仪(分别为 R = 31 500 和 11 930 的 ARCES 和 Goodman 光谱仪)获得的,以寻找最佳的太阳双胞胎候选者,然后在麦当劳天文台以更高的分辨率(TS23,R = 60 000) 和信噪比 (SNR ∼ 300–500)。恒星参数是通过相对于太阳的微分光谱平衡来估计的,这使我们能够实现较高的内部精度(σ(Teff) = 15 K,σ(log g) = 0.03 dex,σ($\rm {[Fe/H]}$) = 0.01 dex,且 σ(vt) = 0.03 km s−1)。我们提出了一类演化与太阳相似的新恒星:太阳代理,它有助于进行与太阳演化相关的研究,例如太阳的旋转和磁演化。它的定义基于金属丰度 (−0.15 dex ≤ $\rm {[Fe/H]}$ ≤ + 0.15 dex) 和质量 (0.95 M⊙ ≤ M ≤ 1.05 M⊙) 约束,从而确保恒星遵循类似的沿主序带的演化路径为太阳。基于这个新定义,我们报告了 70 个新发现的太阳代理、46 个太阳类似物和 13 个太阳型恒星。此外,我们还确定了九个近亲太阳双胞胎,它们的恒星参数与太阳的参数最相似。我们提出了一类演化与太阳相似的新恒星:太阳代理,它有助于进行与太阳演化相关的研究,例如太阳的旋转和磁演化。它的定义基于金属丰度 (−0.15 dex ≤ $\rm {[Fe/H]}$ ≤ + 0.15 dex) 和质量 (0.95 M⊙ ≤ M ≤ 1.05 M⊙) 约束,从而确保恒星遵循类似的沿主序带的演化路径为太阳。基于这个新定义,我们报告了 70 个新发现的太阳代理、46 个太阳类似物和 13 个太阳型恒星。此外,我们还确定了九个近亲太阳双胞胎,它们的恒星参数与太阳的参数最相似。我们提出了一类演化与太阳相似的新恒星:太阳代理,它有助于进行与太阳演化相关的研究,例如太阳的旋转和磁演化。它的定义基于金属丰度 (−0.15 dex ≤ $\rm {[Fe/H]}$ ≤ + 0.15 dex) 和质量 (0.95 M⊙ ≤ M ≤ 1.05 M⊙) 约束,从而确保恒星遵循类似的沿主序带的演化路径为太阳。基于这个新定义,我们报告了 70 个新发现的太阳代理、46 个太阳类似物和 13 个太阳型恒星。此外,我们还确定了九个近亲太阳双胞胎,它们的恒星参数与太阳的参数最相似。15 dex ≤ $\rm {[Fe/H]}$ ≤ + 0.15 dex) 和质量 (0.95 M⊙ ≤ M ≤ 1.05 M⊙) 约束,从而确保恒星沿主干遵循与太阳相似的演化路径顺序。基于这个新定义,我们报告了 70 个新发现的太阳代理、46 个太阳类似物和 13 个太阳型恒星。此外,我们还确定了九个近亲太阳双胞胎,它们的恒星参数与太阳的参数最相似。15 dex ≤ $\rm {[Fe/H]}$ ≤ + 0.15 dex) 和质量 (0.95 M⊙ ≤ M ≤ 1.05 M⊙) 约束,从而确保恒星沿主干遵循与太阳相似的演化路径顺序。基于这个新定义,我们报告了 70 个新发现的太阳代理、46 个太阳类似物和 13 个太阳型恒星。此外,我们还确定了九个近亲太阳双胞胎,它们的恒星参数与太阳的参数最相似。
更新日期:2021-04-08
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