volume 13, issue S336, P325-326 2017
DOI: 10.1017/s1743921317010183
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Soon-Wook Kim, Jeong-Sook Kim

Abstract: AbstractVLBI observation of masers is a powerful mean to understand the early evolutionary phase of massive star formation. A few different scenarios of outflow evolution in the massive protostars have been proposed, and cannot be readily examined because the precise timing of appropriate maser phenomena is difficult. In particular, it has been a matter of debate whether a well-collimated or a less-collimated outflow comes first in the very early phase of the massive protostellar evolution. Long-term, multi-ep…

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