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.

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.
References in periodicals archive ?
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.
2010 was another successful year for the Bronberg Observatory with 17 SN finds, a successful continuation of the faint CV and symbiotic star observing programmes and a valued participation in the microlens follow-up network.
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.
2009 was another successful year for the Bronberg Observatory with 18 SN finds, a successful continuation of the faint CV and symbiotic star observing programmes and a valued participation in the microlens follow-up network.
2008 was another successful year for the Bronberg Observatory with 12 SN finds, a successful continuation of the faint CV and symbiotic star observing programmes and a valued participation in the microlens follow-up network.
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.
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.