Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.325..787r&link_type=abstract
Nature (ISSN 0028-0836), vol. 325, Feb. 26, 1987, p. 787-790. Research supported by the European Southern Observatory and Danish
Astronomy and Astrophysics
Astronomy
65
Infrared Stars, Late Stars, Red Giant Stars, Stellar Evolution, Stellar Mass Ejection, Bubbles, Herbig-Haro Objects, Photographic Plates, Planetary Nebulae, Radial Velocity
Scientific paper
The author reports here the discovery of shocked bipolar bubbles expanding supersonically at right angles to a dense dust disk around the red-giant OH infrared star OH 231.8+4.2. The relative radial velocity between the northern and southern bubble fronts is over 200 km s-1, and with a total physical extent of 0.42 pc and a known inclination, this gives a dynamical age of about 1,500 yr. Herbig-Haro objects are observed at the front of the bubbles, and are probably formed as instabilities in the bow shocks, where two collimated flows ram into the ambient medium. This new phenomenon represents a brief phase of late stellar evolution, immediately preceding the formation of a planetary nebula.
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