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Properties of circumstellar dust in symbiotic Miras (CROSBI ID 603365)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Jurkić, Tomislav ; Kotnik-Karuza, Dubravka Properties of circumstellar dust in symbiotic Miras // Abstract book of Workshop on symbiotic stars, binary post-AGB and related objects / Mikolajewska, Joanna ; Otulakowska-Hypka, Magdalena ; Siodmiak, Natasza et al. (ur.). Varšava: N. Copernicus Astronomical Center, Polish Academy of Science, 2013

Podaci o odgovornosti

Jurkić, Tomislav ; Kotnik-Karuza, Dubravka

engleski

Properties of circumstellar dust in symbiotic Miras

Symbiotic binaries with a cool Mira component are characterized by the presence of substantial dust and by the appearance of near-IR obscuration intervals. To understand such symbiotic Miras, their evolution, mutual interactions between the components and circumstellar matter, the influence of stellar winds and mass transfer mechanism, it is essential to determine the properties of circumstellar dust and their temporal evolution. We have determined the physical properties of circumstellar dust in different obscuration intervals and in different stages after the nova outburst, with special emphasis on two probably best observed symbiotic Miras, HM Sge and RR Tel. Publicly available near- and mid-IR observations were used including infrared spectra from IRAS and ISO, as well as long-term ground-based photometry from SAAO and Crimean observatory. The spectral energy distribution in the near- and mid-IR spectral range (1-15 microns) was obtained for epochs with different obscuration levels and stages of post-nova evolution. 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 have been determined. We have also performed an analysis of pulsations in epochs with and without pronounced near-IR obscuration. These obscuration intervals can be fully understood by increased mass loss and by condensation of new amounts of dust near the sublimation radius which leads to the observed increased optical depth.

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

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Podaci o prilogu

2013.

objavljeno

Podaci o matičnoj publikaciji

Abstract book of Workshop on symbiotic stars, binary post-AGB and related objects

Mikolajewska, Joanna ; Otulakowska-Hypka, Magdalena ; Siodmiak, Natasza ; Szczerba, Ryszard

Varšava: N. Copernicus Astronomical Center, Polish Academy of Science

Podaci o skupu

Workshop on symbiotic stars, binary post-AGB and related objects

predavanje

18.08.2013-23.08.2013

Wierzba, Poljska

Povezanost rada

Fizika