Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212....1d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Jan. 1, 1985, p. 1-21.
Astronomy and Astrophysics
Astronomy
72
Astrometry, Hydroxyl Emission, Infrared Stars, Interstellar Masers, Radio Sources (Astronomy), Stellar Envelopes, Astronomical Coordinates, Astronomical Maps, Distance, Microwave Spectra, Radial Velocity, Radio Telescopes, Stellar Structure
Scientific paper
The authors have observed the 1612-MHz OH maser emission from five OH/IR stars using MERLIN in its spectral-line mode. The observations yield the angular radii of the circumstellar envelopes. These can be combined with the linear radii obtained from phase-lag techniques to calculate source distances. The distances obtained differ significantly from the kinematic estimates and imply peculiar velocities of between 10 and 30 km s-1. The authors have also determined the absolute positions of nine OH/IR objects, and find that they are coincident with the optical positions of the stars, where these positions are available. The authors have collated all published 1612-MHz OH maser maps of OH/IR stars. They find that the observations are generally consistent with the expanding-shell model, although significant asymmetries are present.
Booth Roy S.
Diamond Phil J.
Norris Ray P.
Nyman L.-AA.
Rowland P. R.
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