Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390l..23t&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 390, no. 1, May 1, 1992, p. L23-L26.
Astronomy and Astrophysics
Astrophysics
35
Hydroxyl Radicals, Interstellar Masers, Stellar Envelopes, Supergiant Stars, F Stars, Protoplanets, Solar System Evolution, Stellar Winds
Scientific paper
The discovery of OH 1667-MHz maser emission from the circumstellar envelope of the F-type supergiant star, HD 101584 (IRAS 11385 - 5517) is reported. The OH spectrum has a total velocity range of 84 km/s and shows two unusually broad emission features. Images obtained show that the OH masers are located in a bipolar outflow. Along the bipolar axis there is a strong velocity gradient which is interpreted as resulting from an interaction between a hot stellar wind and a remnant circumstellar envelope. The presence of high-velocity, bipolar molecular gas in the circumstellar envelope of HD 101584, together with the optical classification, provides strong evidence that the star is a protoplanetary nebula. High-velocity outflows associated with axisymmetric geometries are likely to be a general phenomenon for stars in this short-lived evolutionary stage.
Chapman Jessica M.
te Lintel Hekkert T. L. P.
Zijlstra Albert A.
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