Naslov
RR Tel : Determination of Dust Properties during Minimum Obscuration

Autori
Jurkić, Tomislav ; Kotnik-Karuza, Dubravka

Izvornik
Baltic astronomy (1392-0049) 21 (2012), 1/2; 123-130

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
stars: binaries: symbiotic; stars: circumstellar matter; stars: AGB and post-AGB; radiative transfer

Sažetak
The ISO infrared spectra and the SAAO long-term JHKL photometry of RR Tel in the epochs during minimum obscuration are studied in order to construct a circumstellar dust model. The spectral energy distribution in the near- and the mid-IR spectral range (1-15 microns) was obtained for an epoch without the pronounced dust obscuration. The DUSTY code was used to solve the radiative transfer through the dust and to determine the circumstellar dust properties of the inner dust regions around the Mira component. Dust temperature, maximum grain size, dust density distribution, mass-loss rate, terminal wind velocity and optical depth are determined. The spectral energy distribution and the long-term JHKL photometry during an epoch of minimum obscuration show almost unattenuated stellar source and strong dust emission which cannot be explained by a single dust shell model. We propose a two-component model consisting of an optically thin circumstellar dust shell and optically thick dust outside the line of sight in some kind of a flattened geometry, which is responsible for most of the observed dust thermal emission.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA