Langmuir Scattering and High Velocity Features in Stellar Water Masers

Details Langmuir Scattering and High Velocity Features in Stellar Water Masers Langmuir Scattering and High Velocity Features in Stellar Water Masers

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....95..386c&link_type=abstract

Astronomy and Astrophysics, Vol. 95, P. 386, 1981

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

Two prominent stellar water masers, VY CMa and NML Cyg, have been observed over a range of 280 MHz, centered on the 22.2 GHz water line. There was no detectable high velocity emission from either object. Upper limits (4σ) to the ratio of high velocity lines to principal line intensities were 1 10-3 - 9 10-3 and 3 10-2 - 7 10-2 for VY CMa and NML Cyg, respectively. We see no evidence for satellite lines resulting from possible Langmuir scattering of maser radiation in the stellar environments, a result which is incompatible with the shock model for maser-IR stars.

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