M31外盘中PNe的丰度
Abundances of PNe in the Outer Disk of M31
摘要：
本文介绍了M31外盘16个行星状星云的光谱观测和化学丰度。[O III] 4363线在所有天体中都被探测到，这使得直接测量星云温度成为精确确定丰度的必要条件。我们的研究结果表明，在这些M31 PNE显示相同的相关性和一般行为的II型PNE在银河系。我们还计算光电离模型，以获得估计的中心恒星的属性。由此我们推断，我们的样本PNe都位于行星状星云光度函数的峰值附近，起源于2M太阳附近的恒星。最后，假设这些PNe位于M31的盘中，我们绘制了氧丰度梯度，它似乎比银河系中的梯度要浅。
英文摘要：
We present spectroscopic observations and chemical abundances of 16 planetary nebulae (PNe) in the outer disk of M31. The [O III] 4363 line is detected in all objects, allowing a direct measurement of the nebular temperature essential for accurate abundance determinations. Our results show that the abundances in these M31 PNe display the same correlations and general behaviors as Type II PNe in the Milky Way Galaxy. We also calculate photoionization models to derive estimates of central star properties. From these we infer that our sample PNe, all near the peak of the Planetary Nebula Luminosity Function, originated from stars near 2 M_sun. Finally, under the assumption that these PNe are located in M31's disk, we plot the oxygen abundance gradient, which appears shallower than the gradient in the Milky Way.
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