Abstract
The circumstellar envelopes of a sample red giants and supergiants have been investigated using MERLIN 22GHz H2O maser observations and single dish observations of the 22, 321, and 325GFfz water maser lines. The MERLIN data shows that inner circumstellar envelopes are generally asymmetrical with evidence for discs and bipolar outflows among the supergiants, The single dish data shows that the 22 and 325GHz masers occur in the same regions. The 321GHz masers seem to occur further in towards the star. The appearance of ‘wings’ on all three spectra may point to quasi-thermal emission or may be further evidence for the bipolar outflows seen on some MERLIN maps of these stars.
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© 1993 Springer-Verlag
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Yates, J.A. (1993). Circumstellar water masers. In: Clegg, A.W., Nedoluha, G.E. (eds) Astrophysical Masers. Lecture Notes in Physics, vol 412. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-56343-1_292
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DOI: https://doi.org/10.1007/3-540-56343-1_292
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