IC10：通过行星状星云和HII区域人口的最近星暴星系的历史
IC10: the history of the nearest starburst galaxy through its Planetary Nebula and HII region populations
摘要：
本文报道了用双子座北多目标摄谱仪对邻近星暴星系IC 10的5.5 $\times$ 5.5 \arcmin内区的9个行星状星云（PNe）和15个\hii\区的光谱观测结果。在我们的预成像阶段已经发现了12个新的候选PNE。其中9个已经被光谱学证实。在几个星云的电子温度诊断的直接可用性允许在两个时代的IC 10的金属丰度图的准确测定：从\hii地区的现在的时间和老/中间年龄的PNE。我们发现一个非均匀分布的金属在这两个时代，但相似的平均丰度被发现的两个人口。推导出的年龄-金属丰度关系显示出一个小的全球富集解释为SN风和差分气体外流的金属损失。最后，我们分析了氧的产生-通过第三次挖掘-在属于几个矮不规则星系的PN种群的化学丰度模式。我们发现氧的第三次疏浚是一种依赖于金属度的现象，主要发生在12+ $\log$（O/H）$\leq$ 7.7中，而在IC 10 PNe中基本上不存在。
英文摘要：
We report the results of spectroscopic observations, obtained with the Gemini North Multi-Object Spectrograph, of 9 planetary nebulae (PNe) and 15 \hii\ regions located in the 5.5\arcmin $\times$5.5\arcmin inner region of the nearby starburst galaxy IC10. Twelve new candidate PNe have been discovered during our pre-imaging phase. Nine of them have been spectroscopically confirmed. The direct availability of the electron temperature diagnostics in several nebulae allowed an accurate determination of the metallicity map of IC10 at two epochs: the present-time from \hii regions and the old/intermediate-age from PNe. We found a non-homogeneous distribution of metals at both epochs, but similar average abundances were found for the two populations. The derived age-metallicity relation shows a little global enrichment interpreted as the loss of metals by SN winds and to differential gas outflows. Finally, we analyzed the production of oxygen --through the third dredge-up-- in the chemical abundance patterns of the PN populations belonging to several dwarf irregular galaxies. We found that the third dredge-up of oxygen is a metallicity dependent phenomenon occurring mainly for 12+$\log$(O/H)$\leq$7.7 and substantially absent in IC10 PNe.
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