冷红巨星的大气参数和丰度

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Z. Dencs, A. Derekas, T. Mitnyan, M. F. Andersen, B. Cseh, F. Grundahl, V. Hegedűs, J. Kovács, L. Kriskovics, P. L. Palle, A. Pál, L. Szigeti and Sz. Mészáros
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引用次数: 0

摘要

了解 RGB 顶部恒星的大气参数对于揭示银河系的化学成分至关重要,因为它们可以用来探测银河系最遥远的部分。我们的目标是从 APOGEE-2 DR17 数据库中挑选出 21 颗 Teff < 4200 K 的 RGB 恒星,利用安装在匈牙利 Piszkéstető 天文台 1 米望远镜上的摄谱仪和 Hertzsprung SONG 望远镜上的 SONG 摄谱仪(R = 77,000)在 4500-5800 Å 波长范围内进行的新观测,确定它们的化学成分。这是首次使用 Piszkéstető 天文台 1 米望远镜上的摄谱仪(R = 18,000)来测量恒星的丰度。我们利用 MARCS 大气模型和 SYNSPEC 建立了一个新的 LTE 光谱库,其中包括 23 种分子的谱线表,从而利用 FERRE 测定了大气参数(Teff、[Fe/H]、[α/Fe])以及 Si、Ca、Ti、V、Cr、Mn 和 Ni 的丰度。将得到的参数与 APOGEE 的参数进行了比较。我们发现两者的参数总体上吻合,平均差异为:Teff-11.2 K,[Fe/H]0.11 dex,[α/Fe]-0.01 dex。我们的分析成功地证明了 Piszkéstető 天文台的光谱仪能够可靠地测量明亮恒星的丰度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Atmospheric Parameters and Abundances of Cool Red Giant Stars
Understanding the atmospheric parameters of stars on the top of the RGB is essential to reveal the chemical composition of the Milky Way, as they can be used to probe the farthest parts of our Galaxy. Our goal is to determine the chemical composition of 21 RGB stars with Teff < 4200 K selected from the APOGEE-2 DR17 database using new observations carried out with the spectrograph mounted on the 1 m telescope of the Hungarian Piszkéstető Observatory and the SONG spectrograph (R = 77,000) on the Hertzsprung SONG telescope in the 4500–5800 Å wavelength range. This is the first time the spectrograph (R = 18,000) on the 1 m telescope at Piszkéstető Observatory was used to measure the abundances of stars. We created a new LTE spectral library using MARCS model atmospheres and SYNSPEC by including the line list of 23 molecules to determine atmospheric parameters (Teff, , [Fe/H], [α/Fe]) and abundances of Si, Ca, Ti, V, Cr, Mn, and Ni with FERRE. The resulting parameters were compared to that of APOGEE. We found a good agreement in general, the average difference is −11.2 K in Teff, 0.11 dex in , 0.10 dex in [Fe/H], and −0.01 dex in [α/Fe]. Our analysis successfully demonstrates the ability of the spectrograph at Piszkéstető Observatory to reliably measure the abundance of bright stars.
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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