No.
The word "disappearance" refers to the gradual disappearance to a certain extent, or the complete disappearance. Forgetting refers to forgetting something. The parts of speech and the meanings expressed by these two words are completely different, so they cannot be replaced.
"Stars" is Bing Xin's first collection of poems. The collection includes 164 short poems written by the poet from the winter solstice of 1919 to the autumn of 1921. They were first published in Beijing's "Morning News".