Galactic abundance gradient. V.
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This paper reports on the spectroscopic investigation of 12 Cepheids which are situated in the crucial region of galactocentric distances from 9kpc to 12kpc, where according to...
本文报道了对12颗造父变星（Cepheids）的光谱学研究，这些造父变星位于银心距9千秒差距至12千秒差距的关键区域，依据……
