The circumstellar envelope of an unusual OH/IR star, OH 19.2-1.0

Details The circumstellar envelope of an unusual OH/IR star, OH 19.2-1.0 The circumstellar envelope of an unusual OH/IR star, OH 19.2-1.0

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.230..415c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 230, Feb. 1, 1988, p. 415-427.

Astronomy and Astrophysics

Astronomy

27

Hydroxyl Emission, Infrared Stars, Interstellar Masers, Stellar Envelopes, Stellar Spectra, Power Spectra, Stellar Color, Stellar Evolution

Scientific paper

Single-dish and MERLIN observations of the OH 1612-MHz maser emission from the OH/IR star OH 19.2-1.0 are presented. The OH 1612-MHz spectrum has an unusual multiple-peaked profile. Single-dish spectra taken over four years show that the OH emission is variable with a period of ≡600 day. MERLIN maps of the OH masers reveal that the circumstellar envelope is asymmetric. The masers occupy a region of angular extent 0.45×0.15 arcsec2 and show systematic velocity gradients. The observations of OH 19.2-1.0 are interpreted using a geometrical model in which the circumstellar mass-loss is bipolar. The evolutionary status of the star is discussed and it is argued that OH 19.2-1.0 is a late-type OH/IR star which has not yet become a proto-planetary nebula.

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