Chemical Abundances of M-Dwarfs from the Apogee Survey. I. The Exoplanet Hosting Stars Kepler-138 and Kepler-186
Chemical Abundances of M-Dwarfs from the Apogee Survey. I. The Exoplanet Hosting Stars Kepler-138 and Kepler-186
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来自远地点巡天的 M-矮星的化学丰度。
DOI：
10.3847/1538-4357/835/2/239
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
K. Stassun
中科院分区：
文献类型：
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作者：
D. Souto;Kátia Cunha;D. A. García;O. Zamora;C. Prieto;Verne V. Smith;S. Mahadevan;Cullen H. Blake;J. Johnson;H. Jőnsson;M. Pinsonneault;Jon A. Holtzman;S. Majewski;M. Shetrone;J. Teske;D. Nidever;R. Schiavon;J. Sobeck;A. Pérez;Y. G. M. Chew;K. Stassun
我们报告了第一个详细的化学丰度分析的系外行星托管M-矮星开普勒-138和开普勒-186从高分辨率（R 22，500）的H-波段光谱分析从SDSS-IV-APOGEE调查。13种元素C，O，Na，Mg，Al，Si，K，Ca，Ti，V，Cr，Mn和Fe的化学丰度从这些早期M-矮星的APOGEE光谱中提取，通过光谱合成计算与改进的线列表，考虑到H2O和FeH线。本文论证了APOGEE谱可以用来确定M矮星的详细化学成分。这两颗M矮星都显示出中等的亚太阳金属丰度：[Fe/H]开普勒-138 = −0.09 ± 0.09 dex，[Fe/H]开普勒-186 = −0.08 ± 0.10 dex。从这种高分辨率的分析所测得的金属丰度被发现是高出0.1-0.2德克斯比以前的估计，从较低的分辨率光谱。获得的两颗行星宿主恒星的C/O比接近太阳，Kepler-138的值为0.55 ± 0.10，Kepler-186的值为0.52 ± 0.12。Kepler-186的[Si/Fe]比略有提高。
We report the first detailed chemical abundance analysis of the exoplanet-hosting M-dwarf stars Kepler-138 and Kepler-186 from the analysis of high-resolution (R ∼ 22,500) H-band spectra from the SDSS-IV–APOGEE survey. Chemical abundances of 13 elements—C, O, Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, and Fe—are extracted from the APOGEE spectra of these early M-dwarfs via spectrum syntheses computed with an improved line list that takes into account H2O and FeH lines. This paper demonstrates that APOGEE spectra can be analyzed to determine detailed chemical compositions of M-dwarfs. Both exoplanet-hosting M-dwarfs display modest sub-solar metallicities: [Fe/H]Kepler-138 = −0.09 ± 0.09 dex and [Fe/H]Kepler-186 = −0.08 ± 0.10 dex. The measured metallicities resulting from this high-resolution analysis are found to be higher by ∼0.1–0.2 dex than previous estimates from lower-resolution spectra. The C/O ratios obtained for the two planet-hosting stars are near-solar, with values of 0.55 ± 0.10 for Kepler-138 and 0.52 ± 0.12 for Kepler-186. Kepler-186 exhibits a marginally enhanced [Si/Fe] ratio.
M 和 L 矮星中 FeH 的高分辨率 1 6μm 光谱，
DOI：
10.1088/0004-6256/140/4/919
发表时间：
2010
期刊：
The Astronomical Journal
影响因子：
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作者：
Hargreaves;Robert J;Hinkle;Kenneth H;Bauschlicher;Charles W;Sebastian;Seifahrt;Andreas;Bernath;Peter F.
通讯作者：
Peter F.