Journal Article

Spectral indications of ejection of mass by the symbiotic binary Z Andromedae during its 2000–2002 outburst*

N. A. Tomov, M. T. Tomova and D. V. Bisikalo

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 2, pages 829-838
Published in print September 2008 | ISSN: 0035-8711
Published online September 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13597.x
Spectral indications of ejection of mass by the symbiotic binary Z Andromedae during its 2000–2002 outburst*

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High-resolution observations in the region of the lines Hα, He iiλ 4686 and Hγ of the spectrum of the symbiotic binary Z Andromedae were performed in the quiescent state of the system and also during its outburst phase in 2000–2002. The triplet lines of He i had P Cygni profiles indicating stellar wind with a velocity of 60 km s−1 from the hot secondary. This wind created an absorption dip in the emission profile of the line Hγ. The lines Hγ and He iiλ 4686 had a broad emission component, indicating an optically thin stellar wind with a velocity of about 500 km s−1. The intensity of the broad component reached its maximum together with the optical light. To explain the observations, a model with an accretion disc was proposed, where the velocity of the wind from the accretor is supposed to be 500 km s−1. The accretion disc is responsible for the breaking of the stellar wind close to the orbital plane where its velocity decreases to about 60 km s−1. The mass-loss rate of the accretor at the time of a maximal light was obtained of 2.4 × 10−7 (d/1.12 kpc)3/2 M yr−1 and decreased to 1.0 × 10−7 (d/1.12 kpc)3/2 M yr−1 in 2001 October.

Keywords: stars: activity; binaries: symbiotic; stars: individual: Z Andromedae; stars: mass-loss; stars: winds, outflows

Journal Article.  7958 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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