Other
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..771m&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Mar. 15, 1979, p. 771-779. Research supported by the Research Corp. and University of
Other
55
Circular Polarization, Hydroxyl Emission, Infrared Stars, Interstellar Masers, Supergiant Stars, Very Long Base Interferometry, Angular Resolution, Astronomical Spectroscopy, Emission Spectra, High Resolution, Red Shift, Water Masers
Scientific paper
The 1612-MHz hydroxyl maser emission of the infrared star IRC + 10420 was studied over a 10-month period both with a very long baseline interferometer yielding an angular resolution of approximately 0.10 arcsec and with single telescopes. The 1612-MHz VLBI data indicate that individual features are highly circularly polarized (typically 50%), with linear sizes from less than 100 to 400 AU. A map of the OH features of the +44 to +48-km/s complex in left circular polarization indicates a disklike structure of overall extent 8000 AU. The single-telescope spectra also show circular polarization (upper limit about 15%), with time variability of the total flux over a period of several months. It is suggested that IRC + 10420 is a massive star moving rapidly to the left on the horizontal branch of the H-R diagram and which has left a 'fossil remnant' expanding cloud containing the hydroxyl emission. Comparison with other OH/IR supergiant stars indicates that previous distance estimates of 6.8 kpc for IRC + 10420 are too large by a factor of 2.
Benson James M.
Fix John D.
Mutel Robert L.
Webber John Clinton
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