Evolved stars with high velocity H2O maser features - Bipolar outflows with velocity symmetry

Details Evolved stars with high velocity H2O maser features - Bipolar outflows with velocity symmetry Evolved stars with high velocity H2O maser features - Bipolar outflows with velocity symmetry

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..581l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 2, p. 581-594.

Astronomy and Astrophysics

Astrophysics

44

Interstellar Masers, Stellar Evolution, Water Masers, Astronomical Models, Emission Spectra, Stellar Spectra

Scientific paper

Three objects - IRAS 16342-3814, IRAS 19134+2131, and W 43A - appear to be members of a class of unusual evolved stars with very high velocity outflows traced by OH or H2O maser emission, or both. We have monitored the 1.3-cm H2O emission over a period of approximately two years. Drastic temporal changes are observed in the line profiles on time scales as short as one month. The H2O features varied significantly in intensity, but there was no evidence of features shifting in velocity by more than 1 km/s. The intensities of various features seem to rise and fall at a set of velocities that is discontinuous and fixed on a time scale of at least a few years. On the basis of the strong apparent symmetry exhibited by the H2O spectra, central velocities were determined for each object. The probable nature of the objects in this class is discussed. A bipolar geometry is proposed, with an equatorial disk involved in the collimation of a high velocity wind streaming out along the polar axes. The H2O emission is proposed to originate in the polar stream, much farther from the star than the masers in typical evolved stars.

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