Abundance gradients from disk PNs

A new determination of the radial abundance gradients of O/H, Ne/H, S/H, and Ar/H is made for disk planetary nebulae, (PN), that is, those objects of Peimbert types I, II, and...本研究针对盘状行星状星云（planetary nebulae，PN）完成了氧丰度与氢丰度之比（O/H）、氖丰度与氢丰度之比（Ne/H）、硫丰度与氢丰度之比（S/H）以及氩丰度与氢丰度之比（Ar/H）的径向丰度梯度的全新测定，此类天体即属于Peimbert I型、II型及……的天体。