Contents of: VI/111/./abstract/MBARLOW_DUST4_A.abs

The following document lists the file abstract/MBARLOW_DUST4_A.abs from catalogue VI/111.
A plain copy of the file (without headers/trailers) may be downloaded.


SCIENTIFIC ABSTRACT
This proposal is to study the (currently unknown) far-infrared emission
properties of dust grains in the regions where they are formed. The study is
designed to reveal the spectral dependence of the dust continuum emission and
to find new dust emission features that will aid the full identification of the
grains. The targets will be M-giants, Miras, OH/IR  stars, S-stars, carbon
stars, post-AGB transition objects (pre-planetary nebulae), and ionised
planetary nebulae (PN) and their neutral shells (where present). These objects
are believed to be the main sources of the refractory dust grains that are
present in the general insterstellar medium. We will study the characteristics
of the dust emission spectra as a function of stellar mass, evolutionary stage
and chemical composition. None of the numerous mid-infared dust features now
known were predicted prior to their observational discovery and one can
expect a systematic study of the region longwards of 30um to reveal
new dust features that will provide important insights into the nature of
circumstellar and interstellar dust.

A LaTex file containing fuller details of this proposal is available from


OBSERVATION SUMMARY
This proposal is split into four parts - this is part 4.
Full (43-196.7um) LWS grating spectra will be obtained for all
targets (LWS01 AOT in fast mode). The SWS Consortium is obtaining
2.43-45um low-resolution SWS grating spectra of the majority of
these targets (SWS01 AOT, speed code 1), and we will obtain similar
SWS spectra of the remainder of the targets. If objects in the
Orion-hole should be observable (i.e. a Spring launch), the total
amount of LWS Guaranteed (spacecraft) time allocated will be 28.39 hours, of
which 11.04 hours will be for Priority 1 targets. For an Autumn launch
(Sagittarius-hole observable), 27.86 hours of LWS Guaranteed (spacecraft)
time will be allocated, of which 10.82 hours will be for Priority 1
targets.



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