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Structure of the hot object in the symbiotic prototype Z And during its 2000-03 active phase

A. Skopal·A. Vittone·L. Errico·M. Otsuka·S. Tamura·M. Wolf·V. Elkin
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Abstract

Aims: To investigate structure of the hot object in the symbiotic prototype Z And during its major 2000-03 active phase. Methods: Analysis of the far ultraviolet, optical low- and high-resolution spectroscopy and UBVR photometry. Reconstruction of the spectral energy distribution (SED) during the outburst. The Raman scattering process. Results: At the initial stages of the outburst the hot object was characterized by the two-temperature spectrum (a warm stellar radiation and a strong nebular emission) with signatures of a mass-outflow at moderate (100-200 km/s) and very high (1000-2000 km/s) velocities. The corresponding structure of the hot object consists of an optically thick, slowly-expanding disk-like material encompassing the accretor at the orbital plane and a fast optically thin wind over the remainder of the star. A striking similarity of [FeVII]6087 and Raman 6825 profiles at/after the dilution of the disk suggested their origin within the interaction zone where the winds from the binary components collide.

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A. Skopal, A. Vittone, L. Errico, M. Otsuka, S. Tamura, M. Wolf, V. Elkin. 2006-03-27. Structure of the hot object in the symbiotic prototype Z And during its 2000-03 active phase. https://doi.org/10.1051/0004-6361%3A20052917

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