VLBI observations of circumstellar shells around two OH/IR stars

Details VLBI observations of circumstellar shells around two OH/IR stars VLBI observations of circumstellar shells around two OH/IR stars

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..435n&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, May 15, 1984, p. 435-446.

Astronomy and Astrophysics

Astrophysics

30

Hydroxyl Emission, Infrared Stars, Late Stars, Stellar Envelopes, Very Long Base Interferometry, Astronomical Maps, Astrophysics, Interstellar Matter, Stellar Mass Ejection

Scientific paper

MERLIN and VLA maps of the OH masers around OH/IR stars show that their characteristic double-peaked spectrum is caused by an expanding shell of material ejected from the star. In order to investigate the compact structure of the OH masers within this shell the authors have observed two such OH/IR stars (OH 127.8 and 104.9) using the European VLBI network. The resulting VLBI aperture synthesis maps are the first to be made of OH/IR stars. In each case, the maps show compact sources on the nearside of the shell, but no corresponding source on the far side of the shell. This is interpreted in terms of amplification of the stellar thermal emission and a mechanism for this process is outlined.

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