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首页> 外文期刊>The Astrophysical journal >Chemical Abundances In Giants Stars Of The Tidally Disrupted Globular Cluster Ngc 6712 From High-resolution Infrared Spectroscopy
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Chemical Abundances In Giants Stars Of The Tidally Disrupted Globular Cluster Ngc 6712 From High-resolution Infrared Spectroscopy

机译：潮汐破裂的球状星团Ngc 6712的巨星中的化学丰度来自高分辨率红外光谱

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摘要

We present abundances of C, N, O, F, Na, and Fe in six giant stars of the tidally disrupted globular cluster NGC 6712. The abundances were derived by comparing synthetic spectra with high-resolution infrared spectra obtained with the Phoenix spectrograph on the Gemini South telescope. We find large star-to-star abundance variations of the elements C, N, O, F, and Na. NGC 6712 and M4 are the only globular clusters in which F has been measured in more than two stars, and both clusters reveal F abundance variations whose amplitude is comparable to or exceeds that of O, a pattern which may be produced in M ≥ 5 M_☉ AGB stars. Within the limited samples, the F abundance in globular clusters is lower than in field and bulge stars at the same metallicity. NGC 6712 and Pal 5 are tidally disrupted globular clusters whose red giant members exhibit O and Na abundance variations not seen in comparable metallicity field stars. Therefore, globular clusters such as NGC 6712 and Pal 5 cannot contribute many field stars and /or field stars do not form in environments with chemical enrichment histories like those of NGC 6712 and Pal 5. Although our sample size is small, from the amplitude of the O and Na abundance variations we infer a large initial cluster mass and tentatively confirm that NGC 6712 was once one of the most massive globular clusters in our Galaxy.
机译：我们给出了潮汐破裂的球状星团NGC 6712的六颗巨星中C，N，O，F，Na和Fe的丰度。丰度是通过将合成光谱与凤凰光谱仪上获得的高分辨率红外光谱进行比较而得出的双子座南望远镜。我们发现元素C，N，O，F和Na的星到星丰度差异很大。 NGC 6712和M4是唯一在两个以上的恒星中测量过F的球状星团，并且两个星团都揭示了F的丰度变化，其振幅可与O相当或超过O，这可能在M≥5 M_中产生GB AGB星。在有限的样本中，球状星团中的F丰度低于相同金属度的野外和凸起恒星中的F丰度。 NGC 6712和Pal 5是经潮汐破坏的球状星团，其红色巨人成员表现出O和Na的丰度变化，这在可比较的金属性场星中是看不到的。因此，像NGC 6712和Pal 5这样的具有化学富集历史的环境中，球状星团（例如NGC 6712和Pal 5）不能贡献许多场星和/或没有形成场星。尽管我们的样本量很小，但从O和Na的丰度变化推断出较大的初始星团质量，并初步确认NGC 6712曾经是我们银河系中最重的球状星团之一。

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