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D. A. Boboltz (USNO), K. B. Marvel (AAS)
We have conducted full-polarization, spectral-line observations of the v=1,J=1-0 and v=2, J=1-0 SiO masers toward the massive evolved star NML Cygni using the Very Long Baseline Array (VLBA). Each of the two transitions were recorded simultaneously using two overlapping 4-MHz bands to provide coverage over the entire range of SiO maser emission. This velocity range includes both the previously observed peak of emission located at an L.S.R. velocity of 1 km s-1, and a newly identified peak in the spectrum near -18 km s-1. Both peaks of emission were clearly detected in the v=1, J=1-0 transition at 43.1 GHz, while only the peak near the L.S.R. velocity of the star is apparent in the v=2, J=1-0 spectra at 42.8 GHz. We present the results of our observations of the SiO maser emission in the circumstellar envelope of NML Cygni.
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