Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.4908o&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #49.08; Bulletin of the American Astronomical Society, Vol. 34, p.1185
Astronomy and Astrophysics
Astronomy
Scientific paper
We present infrared observations and model calculations of the dust shell surrounding HD 168625 (IRAS 18184-1623). This object is a candidate Luminous Blue Variable due to its photometric variations and the presence of a detached dust shell indicating a major mass-loss episode several hundred years ago. We have conducted a multi-wavelength infrared study of HD 168625, and present here high-resolution near-infrared imaging from NICMOS on HST, which shows substructure in a shell that is clearly detached from the star. We also present temperature and optical depth maps derived from mid-infrared images, which illustrate the toroidal geometry of the dust shell. In addition the these observations, we have modelled the dust shell of HD 168625 using the radiative transfer code 2-Dust, using observationally determined stellar parameters and geometric dust shell parameters as a starting point. We present here a comparison of the model spectral energy distribution to infrared photometry data, and compare model and data images of the dust shell. The shell can be modelled by a dust distribution that is largely disk-like (equator-to-pole density ratio ~ 30) but with an elliptical midshell, as would be formed from the interaction of a fast wind with a pre-existing density constrast.
Bobrowsky Matthew
Meixner Matthew
O'Hara Timothy B.
Speck Angela Karen
Ueta Toshiya
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