Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86..897r&link_type=abstract
Astronomical Journal, vol. 86, June 1981, p. 897-902.
Astronomy and Astrophysics
Astronomy
13
Hydroxyl Emission, Late Stars, M Stars, Masers, Radio Astronomy, Stellar Radiation, Amplitude Distribution Analysis, Diffraction Patterns, Emission Spectra, Line Spectra, Radial Velocity, Radio Interferometers
Scientific paper
Using narrowband filters, two emission features of OH masers were observed in four M-type stars with the VLA. Low- and high-velocity emission features in the 1612-MHz OH transition of IRC+10011 and OH 26.50+0.6 were found to coincide to better than 0.5 arcsec and extend over approximately 2 arcsec. Centroids of emission from different OH transitions came from the same position in W Hya, but may have been slightly separated in VY CMa. Results support models in which OH maser emission originates in the expanding circumstellar envelopes of late-type stars for the stars observed, maser amplification occurs at distances of 0.6 x 10 to the 16th cm at 1665 and 1667 MHz, and from 2 x 10 to the 16th to 12 x 10 to the 16th cm at 1612 MHz. In addition, a comparison of the results for VY CMa with observations of longer baselines suggests a significant number of low surface brightness components not yet mapped.
Johnston Ken J.
Moran James Michael
Reid Mark J.
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