Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...196l..35r&link_type=abstract
Astrophysical Journal, vol. 196, Feb. 15, 1975, pt. 2, p. L35-L37.
Astronomy and Astrophysics
Astronomy
6
Hydroxyl Emission, Infrared Stars, Interferometry, Line Spectra, Maser Outputs, Radio Sources (Astronomy), Cosmic Dust, Interstellar Matter, M Stars, Mira Variables, Molecular Spectra, Size Determination, Stellar Envelopes, Stellar Spectra, Variable Stars
Scientific paper
Results are reported for spectral-line very long baseline interferometric observations of the following II OH/IR objects, which emit strong 1612-MHz OH maser radiation concentrated at two velocities: NML Cyg, R Aql, IRC+10011, IRC-10529, and OH 1837-05. The apparent angular sizes were obtained for NML Cyg and R Aql, and lower limits upon the apparent sizes were obtained for the other objects. The data for NML Cyg agree with previous size determinations and indicate that the low- and high-velocity components are separated by about 20 times their apparent size. The maser component of R Aql is calculated within a factor of two to be about 5 by 10 to the 14th power cm, although the emitting region can be significantly larger. A qualitative description is given for II OH/IR objects with late M-type Mira variable center stars and circumstellar dust shells of similar dimensions.
Muhleman Duane O.
Reid Mark J.
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