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First evidence of multiple populations along the AGB from Str?mgren photometry

机译：Str？mgren光度法在沿AGB的多个种群的初步证据

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Spectroscopic studies have demonstrated that nearly all Galactic globular clusters (GCs) harbour multiple stellar populations with different chemical compositions. Moreover, colour-magnitude diagrams based exclusively on Str?mgrem photometry have allowed us to identify and characterise multiple populations along the RGB of a large number of clusters. In this paper we show for the first time that Str?mgren photometry is also very efficient at identifying multiple populations along the AGB, and demonstrate that the AGB of M?3, M?92, NGC?362, NGC?1851, and NGC?6752 are not consistent with a single stellar population. We also provide a catalogue of RGB and AGB stars photometrically identified in these clusters for further spectroscopic follow-up studies. We combined photometry and elemental abundances from the literature for RGB and AGB stars in NGC?6752 where the presence of multiple populations along the AGB has been widely debated. We find that, while the MS, SGB, and RGB host three stellar populations with different helium and light element abundances, only two populations of AGB stars are present in the cluster. These results are consistent with standard evolutionary theory.
机译：光谱研究表明，几乎所有的银河系球状星团（GC）都具有化学成分不同的多个恒星族。此外，仅基于Str？mgrem光度法的色度图使我们能够识别和表征沿大量簇的RGB的多个种群。在本文中，我们首次证明Str？mgren光度法在识别AGB上的多个种群方面也非常有效，并证明了M？3，M？92，NGC？362，NGC？1851和NGC的AGB。 ？6752与单个恒星种群不一致。我们还提供了在这些星团中通过光度法确定的RGB和AGB星的目录，以用于进一步的光谱学后续研究。我们结合了NGC？6752中有关RGB和AGB恒星的文献中的光度学和元素丰度，对AGB沿线存在多个种群已进行了广泛讨论。我们发现，尽管MS，SGB和RGB拥有三个氦气和轻元素丰度不同的恒星群，但星团中仅存在两个AGB恒星群。这些结果与标准进化论是一致的。

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