منابع مشابه
The circumstellar dust shell ?
A spherically symmetric dust radiative transfer code is used to model the circumstellar dust shell around IRC +10 216. Compared to numerous previous models a much larger body of observational data is used as constraints; the spectral energy distribution between 0.5 and 60000 µm, 2-4 µm and 8-23 µm spectra, optical, far-infrared and centimeter sizes and interferometric visibility curves between ...
متن کاملHST / ACS observations of shell galaxies : inner shells , shell colours and dust . ?
Context. Shells in Elliptical Galaxies are faint, sharp-edged features, believed to provide evidence for a merger event. Accurate photometry at high spatial resolution is needed to learn on presence of inner shells, population properties of shells, and dust in shell galaxies. Aims. Learn more about the origin of shells and dust in early type galaxies. Methods. V-I colours of shells and underlyi...
متن کاملCarbon stars with detached dust shells: the circumstellar envelope of UUAurigae
We have modelled the spectral energy distribution of the carbon-rich star UU Aurigae, which shows an excess flux in the far infrared and sub-millimeter regions, in terms of a detached shell generated by an episode of higher (than the current) mass loss rate. Twodifferent compositions for the detached shell were used: oxygen-rich and carbon-rich dust grains. By assuming that at longer wavelength...
متن کاملA double dust shell surrounding the carbon star UAntliae
We have investigated the N-type carbon star U Ant in high resolution IRAS images. We find that the star shows two extended dust shell components and that these two shells are also clearly present in the original survey scan data. We have fitted a double dust shell model with spherical symmetry to the data to obtain the physical quantities of the shells. The inner dust shell component is related...
متن کاملDetection of circumstellar dust shell around the supergiant TV Geminorum from milliarcsecond resolution near-infrared observations
A lunar occultation of the M1 supergiant TV Gem has been observed in the near infrared region at 2.2μm. A detailed analysis of the observed occultation light curve has been performed using two different reduction methods permitting the circumstellar dust envelope to be directly detected for the first time around TV Gem. The star has been resolved to yield a uniform disk diameter of 4.9±0.3milli...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1982
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/201.2.281