symbiotic star

symbiotic star

(sim-bÿ-ot -ik, -bee-) A variable ‘star’ whose spectrum shows lines characteristic of gases at two very different temperatures, typically of an M star (3500 K) and a B star (20 000 K) superimposed. It is in fact a semidetached close binary star: a red giant component produces the low-temperature spectrum whereas the higher-temperature spectrum comes from gas streams that are falling on to a companion star, usually a white dwarf or a main-sequence star, but sometimes possibly a neutron star. The mass loss is due to the giant's stellar wind, and so is much slower than the gravitational transfer in the otherwise-similar recurrent novae. Symbiotic stars suffer smaller and more irregular outbursts than other cataclysmic variables. An outburst in the R Aquarii system has produced a narrow jet some 1500 AU in length, visible to optical and radio telescopes. The gas in the jet is traveling at 2000 km s–1, and is apparently a milder version of the ejection found in SS433. Some other well-studied symbiotic stars are Z Andromedae, BF Cygni, RW Hydrae, AG Pegasi, and AX Persei.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

symbiotic star

[‚sim·bē′äd·ik ′stär]
(astronomy)
A stellar object whose optical spectrum displays features indicative of two very different stellar regimes: a stellar spectrum whose flux distribution and absorption lines suggest the presence of a cool star, and emission lines which can be formed only in a much hotter medium.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
A et al., 'Minimum of the lightcurve of the classical symbiotic star AS 338 in 1999', Astronomy letters 27, 1, 51-57, 2001
"This model for He 2-104 is neither that of a symbiotic star nor that of a planetary nebula," they say.
Many of the people who sent me their notes seemed more fascinated by the symbiotic star near NGC 6441 than they were with the cluster itself.
[4] The monitoring of faint symbiotic star systems in the Southern hemisphere was started in 2004 and turns out to be a very rewarding project.
CH Cygni is the brightest symbiotic star: a cool red giant with an unseen, much hotter close companion that's revealed by the star's mixed hot-and-cool spectrum.
2007 was another successful year for the Bronberg Observatory with 10 SN finds, a successful continuation of the symbiotic star observing programme and a more streamlined observing plan for CVs.
Astronomers agree that R Aquarii is a symbiotic star -- an interacting binary comprising a red giant and a white dwarf.
Stars that show such a combination-of-opposites spectrum are called symbiotic stars. R Aquarii is the closest of them at a distance of about 700 light-years.
Abstract: Symbiotic stars are interacting binaries in which the first-formed white dwarf accretes and burns material from a red giant companion.
For all the different types of compact binary stars--cataclysmic variable, symbiotic stars, X-ray binaries, and binary pulsars to name a few--the evolution of all of them is driven by the common mechanism of angular momentum loss.
This project has continued to produce interesting information on the select group of symbiotic stars.
This project is very well on track and has continued to produce interesting information on the select group of symbiotic stars. Efforts were started to review comparison sequences and to improve overall photometric accuracy in the V band.