Proc. IAU volume 13, issue S336, P225-230 2017 DOI: 10.1017/s174392131800011x View full text
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S. Goedhart, R. van Rooyen, D. J. van der Walt, J. P. Maswanaganye, G. C. MacCleod, A. Sanna

Abstract: AbstractThe first periodic Class II methanol maser was reported on in 2003. Since that time, a number of different monitoring programmes have found periodic masers, as well as other modes of variability. In a few cases, periodicity has been found in other maser species such as formaldehyde and water. Several distinct characteristics of light curves have been noted, possibly pointing to different underlying mechanisms for periodicity if one assumes a linear response to incoming radiation. I will give a brief ov…

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