论文标题
光谱质量对雾化丰度的影响
The impact of spectra quality on nebular abundances
论文作者
论文摘要
我使用不同作者观察到的42个行星星云（PNE）的179个光谱样品探讨了观察误差对烟囱化学丰度的影响。以均质的方式分析光谱，以得出物理条件以及离子和总丰度。重组对[O II]和[n II]发射线的影响是通过在统计平衡方程中包括有效的重组系数来估计的，这些系数可用于o $^+$和n $^+$。结果显示，结果与使用先前方法得出的结果显着不同。 [O II]的蓝色和红线得出的O $^+$丰度不同于6倍，表明在波长中广泛分离的线的相对强度可能是高度不确定的。实际上，我在4000-6800的范围内排队，这意味着大多数光谱都比预期的要蓝。使用不同的标准将分数分配给光谱，并且每个PN得分最高的光谱被视为参考光谱。参考光谱得出的丰度与每个对象可用的其他光谱得出的丰度之间的差异用于估计最终丰度中的单个观察性不确定性：O/H和AR/H，0.14 DEX的n/h，0.14 DEX，用于N/H，NE/H，NE/H，以及Cl/H，以及0.16 DEX，以及S/H的0.16 DEX。
I explore the effects of observational errors on nebular chemical abundances using a sample of 179 optical spectra of 42 planetary nebulae (PNe) observed by different authors. The spectra are analysed in a homogeneous way to derive physical conditions and ionic and total abundances. The effects of recombination on the [O II] and [N II] emission lines are estimated by including the effective recombination coefficients in the statistical equilibrium equations that are solved for O$^+$ and N$^+$. The results are shown to be significantly different than those derived using previous approaches. The O$^+$ abundances derived with the blue and red lines of [O II] differ by up to a factor of 6, indicating that the relative intensities of lines widely separated in wavelength can be highly uncertain. In fact, the He I lines in the range 4000-6800 A imply that most of the spectra are bluer than expected. Scores are assigned to the spectra using different criteria and the spectrum with the highest score for each PN is taken as the reference spectrum. The differences between the abundances derived with the reference spectrum and those derived with the other spectra available for each object are used to estimate the one-sigma observational uncertainties in the final abundances: 0.11 dex for O/H and Ar/H, 0.14 dex for N/H, Ne/H, and Cl/H, and 0.16 dex for S/H.
