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HIGH-RESOLUTION INFRARED SPECTROSCOPY OF THE OLD OPEN CLUSTER NGC 6791

机译:旧的开放簇NGC 6791的高分辨率红外光谱

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摘要

We report abundance analysis for six M giant members of the old open cluster NGC 6791, based on infrared spectroscopy (1.5-1.8 μm) at R = 25,000, using the NIRSPEC spectrograph at the Keck II telescope. We find the iron abundance < [Fe/H] > = +0.35 ± 0.02, confirming the supersolar metallicity of this cluster as derived from optical medium-high resolution spectroscopy. We also measure C, O, and other α-element abundances, finding a roughly solar value of [α/Fe] and < [C/Fe] > = -0.35. Our approach constrains [O/Fe] especially well, on the basis of the measurement of a number of OH lines near 1.6 μm; we find [O/Fe] = -0.07 ± 0.03. The solar value of [α/Fe] is in contrast to the composition of similar stars in the Galactic bulge. We also find a low value of ~(12)C/ ~(13)C ≈ 10, confirming the presence of extramixing processes during the red giant phase of evolution, up to supersolar metallicities.
机译:我们使用Keck II望远镜的NIRSPEC光谱仪报告了基于R = 25,000的红外光谱(1.5-1.8μm)对旧的开放星团NGC 6791的六个M巨型成员的丰度分析。我们发现铁的丰度<[Fe / H]> = +0.35±0.02,证实了该簇的超太阳能金属性是从光学中高分辨率光谱学得出的。我们还测量了C,O和其他α元素的丰度,找到了[α/ Fe]和<[C / Fe]> = -0.35的大致太阳值。我们的方法在测量1.6μm附近的许多OH线的基础上,对[O / Fe]的约束特别好。我们发现[O / Fe] = -0.07±0.03。 [α/ Fe]的太阳值与银河膨胀中类似恒星的组成相反。我们还发现〜(12)C /〜(13)C≈10的低值,这证实了在演化的红色巨人阶段期间存在超混合过程,直至超太阳能金属性。

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