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

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

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mnras.389..829t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 389, Issue 2, pp. 829-838.

Astronomy and Astrophysics

Astronomy

5

Stars: Activity, Binaries: Symbiotic, Stars: Individual: Z Andromedae, Stars: Mass-Loss, Stars: Winds, Outflows

Scientific paper

High-resolution observations in the region of the lines Hα, HeII λ4686 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 HeI 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 HeII λ4686 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 Msolar yr-1 and decreased to 1.0 × 10-7 (d/1.12 kpc)3/2 Msolar yr-1 in 2001 October.
Based on observations collected at the National Astronomical Observatory Rozhen, Bulgaria.
E-mail: tomov@astro.bas.bg

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