标题： 红巨星在疏散星团NGC 752、NGC 1817、NGC 2360和NGC 2506中的综合丰度分析 显示英文标题

标题： Comprehensive abundance analysis of red giants in the open clusters NGC 752, NGC 1817, NGC 2360 and NGC 2506

摘要： 我们分析了四个疏散星团的红巨星成员的高色散阶梯光谱（$R \ga 50,000$），以得出许多元素的丰度。 红巨星之间的温度和重力差异非常小，几乎相同的恒星光线被使用，从而减少了随机误差。 星团平均丰度的误差通常在0.02到0.07 dex范围内。 我们目前的样本覆盖了从8.3到10.5 kpc的银河系中心距离。 [Fe/H]值对于NGC 752为$-0.02\pm$0.05，对于NGC 2360为$-0.07\pm$0.06，对于NGC 1817为$-0.11\pm$0.05，对于NGC 2506为$-0.19\pm$0.06。 从钠到铕的元素相对于铁的丰度在测量不确定范围内与场星薄盘巨星的已发表丰度相等。 这支持了场星来自被破坏的疏散星团的观点。 显示英文摘要

摘要： We have analyzed high-dispersion echelle spectra ($R \ga 50,000$) of red giant members for four open clusters to derive abundances for many elements. The spread in temperatures and gravities being very small among the red giants nearly the same stellar lines were employed thereby reducing the random errors. The errors of average abundance for the cluster were generally in 0.02 to 0.07 dex range. Our present sample covers galactocentric distances of 8.3 to 10.5 kpc. The [Fe/H] values are $-0.02\pm$0.05 for NGC 752, $-0.07\pm$0.06 for NGC 2360, $-0.11\pm$0.05 for NGC 1817 and $-0.19\pm$0.06 for NGC 2506. Abundances relative to Fe for elements from Na to Eu are equal within measurement uncertainties to published abundances for thin disk giants in the field. This supports the view that field stars come from disrupted open clusters.