Issue |
A&A
Volume 450, Number 3, May II 2006
|
|
---|---|---|
Page(s) | 1051 - 1059 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20054569 | |
Published online | 19 April 2006 |
Near-infrared observations of water-ice in OH/IR stars
1
Stockholm Observatory, AlbaNova, Dept. of Astronomy, 106 91 Stockholm, Sweden
2
Dept. Physics & Astronomy, U. of Missouri Culombia, 300 Physics Building UMC, Columbia, MO 65211, USA
3
USRA/SOFIA, NASA Ames Research Center, MS 211-3, Moffett Field, CA 94035, USA
Received:
22
November
2005
Accepted:
24
January
2006
A search for the near-infrared water-ice absorption band was made in a number
of very red OH/IR stars which are known to exhibit the 10 μm silicate
absorption.
As a by-product, accurate
positions of these highly reddened objects are obtained. We derived a dust
mass loss rate for each object by modelling the spectral energy distribution
and the gas mass loss rate by solving the equation of motion for the
dust drag wind. The derived mass loss rates show a strong correlation
with the silicate optical depth as well as that of the water-ice.
The stars have a high mass loss rate (
yr-1)
with an average gas-to-dust mass ratio of 110.
In objects which show the 3.1 μm water-ice absorption, the near-IR slope
is much steeper than those with no water-ice. Comparison between our
calculated mass loss rates and those derived from
OH and CO observations indicates that these stars have recently
increased their mass loss rates.
Key words: stars: AGB and post-AGB / stars: circumstellar matter / stars: evolution / stars: late-type / stars: mass-loss / infrared: stars
© ESO, 2006
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