外星系中的行星状星云
Planetary Nebulae Populations in External Galaxies
摘要：
本文着重介绍了外星系行星状星云作为光迹的性质、恒星星族的性质以及母星系的距离和运动学。本文根据目前用行星状星云摄谱仪（PN.S）和其他仪器对行星状星云的观测，介绍了关于巨椭圆星系外区运动学和这些系统中光度特定PN数（α参数）的最新结果。最后，简要讨论了在附近的星团，如室女座和长蛇座I中，行星状星云作为漫射光的示踪物。
英文摘要：
This review highlights the properties of the planetary nebulae in external galaxies as tracers of light, of the stellar population properties, and of the distances and kinematics of the parent galaxies. Recent results on the kinematics of the outer regions in giant elliptical galaxies and on the luminosity specific PN numbers (the α parameter) in these systems are presented, based on current surveys of planetary nebulae with the Planetary Nebulae Spectrograph (PN.S) and other instruments. Finally a brief discussion is given of planetary nebulae as tracers of the diffuse light in the nearby clusters, such as Virgo and Hydra I.
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