Abstract We present a model which explains the observed multi-linear spatial structures with different velocity gradients of the 50–61A+ methanol line at 6.7 GHz. We consider this and other hypotheses and conclude that the methanol maser emission probably comes from some thin rings variously inclined to the line of sight.
Keywords masers --- stars: circumstellar matter --- stars: formation
It accepts original submissions from all over the world and is internationally published and distributed by IOP