The Hα surface brightness — radius plane as a diagnostic tool for photoionized nebulae

11th Pacific Rim Conference on Stellar Astrophysics: Physics and Chemistry of the Late Stages of Stellar Evolution

物理学;天文学

Frew, David J.^1,2 ; Bojii, Ivan S.^1,2 ; Parker, Quentin A.^1,2

Department of Physics, University of Hong Kong, Hong Kong, Hong Kong^1

Laboratory for Space Research, University of Hong Kong, Hong Kong, Hong Kong^2

关键词: Diagnostic tools;    H-alpha;    High resolution;    Massive stars;    Narrow bands;    Planetary nebulae;    Robust distance;    Surface brightness;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/3/032015/pdf
DOI  :  10.1088/1742-6596/728/3/032015

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The Hα surface brightness - radius (SHα-r) relation is a robust distance indicator for planetary nebulae (PNe), further enhanced by different populations of PNe having distinct loci in SHα-r space. Other types of photoionized nebulae also plot in quite distinct regions in the SHa-r plane, allowing its use as a diagnostic tool. In particular, the nova shells and massive star ejecta (MSE) plot on relatively tight loci illustrating their evolutionary sequences. For the MSE, there is potential to develop a distance indicator for these objects, based on their trend in SHα-r space. As high-resolution, narrowband surveys of the nearest galaxies become more commonplace, the SHα-r plane is a potentially useful diagnostic tool to help identify the various ionized nebulae in these systems.