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The potassium abundance in the globular clusters NGC 104, NGC 6752 and NGC 6809

机译：NGC 104，NGC 6752和NGC 6809球状星团中的钾丰度

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摘要

We derived potassium abundances in red-giant-branch stars in the Galactic globular clusters NGC 104 (144 stars), NGC 6752 (134 stars), and NGC 6809 (151 stars) using high-resolution spectra collected with FLAMES at the ESO – Very Large Telescope. In the samples we consider, we do not find significant intrinsic spreads in [K/Fe], which confirms the previous findings, but which is at variance with the cases of the massive clusters NGC 2419 and NGC 2808. Additionally, marginally significant [K/Fe] ? [O/Fe] anti-correlations are found in NGC 104 and NGC 6809, and [K/Fe] ? [Na/Fe] correlations are found in NGC 104 and NGC 6752. No evidence of [K/Fe] ? [Mg/Fe] anti-correlation are found. The results of our analysis are consistent with a scenario in which the process leading to the multi-populations in globular clusters also implies enrichment in the K abundance, the amplitude of the associated [K/Fe] enhancement becoming measurable only in stars showing the most extreme effects of O and Mg depletion. Stars enhanced in [K/Fe] have so far only been found in clusters harbouring some Mg-poor stars, while the other globulars, without a Mg-poor sub-population, show small or null [K/Fe] spreads.
机译：我们使用在ESO上用FLAMES收集的高分辨率光谱，得出了银河系球状星团NGC 104（144星），NGC 6752（134星）和NGC 6809（151星）中的红色巨星星中的钾丰度–非常大型望远镜。在我们考虑的样本中，我们并未在[K / Fe]中发现显着的内在扩展，这证实了先前的发现，但与大规模星团NGC 2419和NGC 2808的情况有所不同。此外，边际显着[K] / Fe]？在NGC 104和NGC 6809中发现了[O / Fe]反相关，并且[K / Fe]≥在NGC 104和NGC 6752中发现了[Na / Fe]相关性。发现[Mg / Fe]反相关。我们的分析结果与一种情景相一致，在该情景中，导致球状星团中多种群的过程也暗示了钾丰度的富集，相关的[K / Fe]增强幅度仅在显示最大的恒星中才可测量。 O和Mg耗尽的极端影响。迄今为止，仅在含有一些贫镁星的星团中才发现以[K / Fe]增强的恒星，而没有贫Mg子种群的其他球状体则显示出很小或无效的[K / Fe]扩散。

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