Maser Mapping and Dust Properties of Red Supergiant Winds |
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| Authors: | Anita MS Richards R J Cohen J A Yates |
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| Institution: | (1) NRAL Jodrell Bank, University of Manchester, UK;(2) Dept. of Physical Sciences, University of Herts, UK |
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| Abstract: | Maser emission from the circumstellar envelopes of four late-type red supergiants has been mapped with milli-arcsecond resolution
using MERLIN1. The wind is driven by radiation pressure on dust and the structure and kinematics of the masing regions reflect
the dust properties. The unbeamed radius of water maser blobs, ∼ 1012 m, has been measured for the first time. The velocity gradient is used to derive the dust absorption coefficient which increases
with radius from ≤ 0.1 to ≤ 1.0 m2 kg−1. Comparison with laboratory studies suggests that small crystalline grains are formed near the star and are annealed into
astronomical silicates at larger distances.
This revised version was published online in September 2006 with corrections to the Cover Date. |
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