Journal Article

The spectral energy distribution of D-type symbiotic stars: the role of dust shells

R. Angeloni, M. Contini, S. Ciroi and P. Rafanelli

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 3, pages 2075-2086
Published in print March 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.16067.x
The spectral energy distribution of D-type symbiotic stars: the role of dust shells

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We have collected continuum data of a sample of D-type symbiotic stars. By modelling their spectral energy distribution in a colliding-wind theoretical scenario we have found characteristics common to all the systems: (1) at least two dust shells are clearly present, one at ∼1000 K and the other at ∼400 K; they dominate the emission in the infrared; (2) the radio data are explained by thermal self-absorbed emission from the reverse shock between the stars; while (3) the data in the long wavelength tail come from the expanding shock outwards the system; (4) in some symbiotic stars, the contribution from the white dwarf in the UV is directly seen. Finally, (5) for some objects soft X-ray emitted by bremsstrahlung downstream of the reverse shock between the stars is predicted. The results thus confirm the validity of the colliding-wind model and the important role of the shocks. The comparison of the fluxes calculated at the nebula with those observed at the Earth reveals the distribution throughout the system of the different components, in particular the nebulae and the dust shells. The correlation of shell radii with the orbital period shows that larger radii are found at larger periods. Moreover, the temperatures of the dust shells regarding the sample are found at ∼1000 and ≤400 K, while in the case of late giants they spread more uniformly throughout the same range.

Keywords: binaries: symbiotic; stars: individual: SS73 38; stars: individual: V835 Cen; stars: individual: HM Sge; stars: individual: V1016 Cyg; stars: individual: V627 Cas

Journal Article.  9074 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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