Planetary nebulae as standard candles. IV.

We present the results of a planetary nebula survey of galaxies in the Leo I group performed with the Kitt Peak and Cerro Tololo 4m telescopes and on-band off-band {lambda}5007...我们报道了针对狮子座I（Leo I）星系群内星系开展的行星状星云巡天结果，该巡天依托基特峰（Kitt Peak）与塞罗托洛洛（Cerro Tololo）4米望远镜完成，并采用了5007埃（λ5007）波长处的通带与偏带观测方案……