U Her and RR Aql 22GHz spectra
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Water maser emission is often found in the circumstellar envelopes of evolved stars, that is, asymptotic-giant-branch stars and red supergiants with oxygen-rich chemistry. The...

Water maser emission is often found in the circumstellar envelopes of evolved stars, that is, asymptotic-giant-branch stars and red supergiants with oxygen-rich chemistry. The...