标题： 大麦哲伦云中发现的一个新的行星状星云族群（I）：初步样本 显示英文标题

标题： A New Population of Planetary Nebulae Discovered in the Large Magellanic Cloud (I): Preliminary Sample

摘要： 我们报告了在大麦哲伦云（LMC）中发现的73颗新的行星状星云（PNe）的初步结果，这些发现是在使用英澳望远镜（AAT）进行确认性的二维光纤光谱仪（2dF）观测之后得出的。 候选源最初来自我们用英国施密特望远镜（UKST）获得的LMC中心25平方度的新深度高分辨率氢α图的10%子区域。 通过将一打两小时的氢α曝光图像进行多曝光中值叠加，高分辨率地图的深度被扩展到Hα的Requiv ~ 22（4.5 × 10^-17 ergs cm^-2 s^-1 Ang^-1）。 由此产生的地图比目前可用的最佳广域窄带LMC图像至少深一个星等。 这种深度结合我们的选择技术，首次发现了许多新发现和已知LMC PNe周围的扩展AGB晕。 一旦完成，我们的新调查有望将LMC的PN群体增加三倍，并对LMC的PN亮度函数、动力学、丰度梯度化学演化以及通过研究AGB晕来确定低质量到中等质量恒星的初始与最终质量关系产生重大影响。 显示英文摘要

摘要： We report our initial discovery of 73 new planetary nebulae (PNe) in the Large Magellanic Cloud (LMC) following confirmatory 2dF spectroscopy on the Anglo-Australian Telescope (AAT). Preliminary candidate sources come from a 10 per cent sub-area of our new deep, high resolution H-alpha map of the central 25 deg. square of the LMC obtained with the UK Schmidt Telescope (UKST). The depth of the high resolution map was extended to Requiv~22 for H-alpha (4.5 x 10-17 ergs cm-2 s-1 Ang-1) by a process of multi-exposure median co-addition of a dozen 2-hour H-alpha exposures. The resulting map is at least 1-magnitude deeper than the best wide-field narrow-band LMC images currently available. This depth, combined with our selection technique, has also led to the discovery of extended AGB halos around many new and previously known LMC PNe for the first time. Once complete, our new survey is expected to triple the LMC PN population and have significant implications for the LMC PN luminosity function, kinematics, abundance gradients chemical evolution and, via study of the AGB halos, the initial to final mass relation for low to intermediate mass stars.