SiO Maser Emission Toward the Red Supergiant NML Cygni

Details SiO Maser Emission Toward the Red Supergiant NML Cygni SiO Maser Emission Toward the Red Supergiant NML Cygni

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5005b&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #50.05; Bulletin of the American Astronomical Society, Vol. 31, p.897

Astronomy and Astrophysics

Astronomy

Scientific paper

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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