Symbiotic Stars: the Geometry of the Radio Emitting Regions

Details Symbiotic Stars: the Geometry of the Radio Emitting Regions Symbiotic Stars: the Geometry of the Radio Emitting Regions

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........25k&link_type=abstract

Thesis (PH.D.)--UNIVERSITY OF CALGARY (CANADA), 1995.Source: Dissertation Abstracts International, Volume: 57-01, Section: B, pa

Computer Science

10

Colliding Winds

Scientific paper

Radio emission from symbiotic stars is examined to determine the density, distribution, and dynamics of material in the circumstellar nebulae. AT observations have been made of four southern systems with declinations <-55^circ (BI Cru, He 2-106, HD 149427, and RR Tel). Four northern objects have been observed both at the VLA and MERLIN (HM Sge, V1016 Cyg, AG Peg and Z And). Observations are analysed in terms of the the STB model (Seaquist, Taylor and Button 1984), and various CW ("Colliding Winds") models. Three configurations of CW models are considered: the "CWc" (concentric) model; the "CWb" (binary) model; and the "CWo" (orbital) model. The CWc and CWb models derive from earlier works (Kwok, Purton and Fitzgerald 1978; Kwok 1987a; Girard and Willson 1987), and various refinements and extensions are introduced here: e.g. the treatment of thermal pressure in the unshocked stellar winds, and the derivation of densities and thicknesses for the interaction zones. The CWo model is essentially original. The radio morphologies and spectra of the observed systems are well explained in terms of the models considered. The southern systems are consistent with the STB model and also with the CWb model. The binary separations indicated for BI Cru and He 2-106 ({~}3000D kpc AU) are, however, much larger than appropriate for known processes of accretional heating of the hot component. Z And is consistent with both a simple STB model, and with a modified STB model including a "no-recombination" (NR) shell. AG Peg is well explained by the CWo model, with variable hot component mass loss. HM Sge and V1016 Cyg are interpreted with reference to a combined STB/CW model.

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