DJ van der Walt, JM Maswanganye, S Etoka, S Goedhart, SP van den Heever
Published 2016-01-21Version 1
A number of mechanisms to understand the periodic class II methanol masers associated with some high-mass star forming regions have been proposed in the past. Two recent proposals, ie. by Parfenov &Sobolev (2014) and Sanna et al. (2015) were presented to explicitly explain the periodic masers in sources with light curves similar to the methanol masers in G9.62+0.20E. We evaluate to what extent the proposals and models presented by these authors can explain the light curve of the methanol masers in G9.62+0.20E. It is argued that neither of the proposed mechanisms can reproduce the light curves of the methanol masers in G9.62+0.20E.
Comments: 6 pages, 3 figures. Accepted (17/01/2015) for publication in Astronomy and Astrophysics
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Periodic class II methanol masers in G9.62+0.20E
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