IPHAS和SDSS中行星状星云的中心星
Central Stars of Planetary Nebulae in IPHAS and SDSS
摘要：
行星状星云（PNE）的空间密度和出生率是高度不确定的。不同的研究得出了大范围的形成率，这导致了对低质量和中等质量恒星最终演化阶段的相互矛盾的想法。我们开始了一个项目，使用2kpc内的PNE样本来推断出生率。中心恒星将在PNe场中通过其光度颜色识别，然后用于建立改进的距离估计。为了方便这一点，我们已经创建了网格的光度颜色，用于约束恒星参数。到目前为止，我们的研究集中在SDSS和INT光度Halalpha调查（IPHAS）中的PNE。IPHAS是一个接近完整的北银河系平面巡天，在H α，r'和i'波段。许多以前未知的PNE已经被IPHAS发现。我们调查的PN出生率估计一个更完整的本地样本的影响。
英文摘要：
Space densities and birthrates of Planetary Nebulae (PNe) are highly uncertain. A large range of formation rates has been derived by different studies, which has led to contradicting ideas for the final evolutionary phases of low and intermediate mass stars. We started a project to deduce a birthrate using a sample of PNe within 2kpc. The central stars will be identified in the PNe fields by their photometric colours and then used to establish improved distance estimates. To facilitate this we have created grids of photometric colours which are used to constrain stellar parameters. Our study has concentrated on PNe in SDSS and the INT Photometric Halpha Survey (IPHAS) so far. IPHAS is a nearly complete northern galactic plane survey in Halpha, r' and i' bands. Many previously unknown PNe have been discovered with IPHAS. We investigate implications of a more complete local sample on PN birthrate estimates.
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