小麦哲伦星云中一个新的相对较老的星团的识别
Identification of a new relatively old star cluster in the Small Magellanic Cloud
摘要：
我们目前的年龄和金属丰度的估计结果，未经研究的SMC集团ESO 51-SC 09，从CCD BVI测光获得的ESO NTT与EMMI附加。ESO 51-SC 09是一个相对较小的星系团（FWHM =（10 +- 1）pc），位于星系中心偏北约4度。我们首次报道了ESO 51-SC 09的平均年龄为（7.0 ± 1.3）Gyr，平均金属丰度为[Fe/H] =（-1.00 ± 0.15）dex，从而认为ESO 51-SC 09属于最古老的SMC星系团。我们发现，该星团被投射到一个占主导地位的领域恒星星族老（年龄~ 10-13 Gyr）和更多的金属贫（[Fe/H] = -1.3 +-0.2 dex），使该集团可以达到它的当前位置，因为它的轨道运动。
英文摘要：
We present results on the age and metallicity estimates of the astonishingly unstudied SMC cluster ESO 51-SC09, from CCD BVI photometry obtained at the ESO NTT with the EMMI attached. ESO 51-SC09 turns out to be a relatively small cluster (FWHM = (10 +- 1) pc) located ~ 4 deg northward from the galaxy center. We report for the first time a mean cluster age of (7.0 +- 1.3) Gyr and a mean cluster metallicity of [Fe/H] = (-1.00 +- 0.15) dex, concluding that ESO 51-SC09 belongs to the group of the oldest SMC clusters. We found that the cluster is projected onto a dominant field stellar population older (age ~ 10-13 Gyr) and more metal-poor ([Fe/H] = -1.3 +- 0.2 dex), so that the cluster could reach its current location because of its orbital motion.
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