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.

单词	symbiotic star
释义	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.
随便看	genus myopus genus myosotis genus myotis genus myrciaria genus myrica genus myricaria genus myriophyllum genus myristica genus myrmecia genus myrmecobius genus myrmecophaga genus myrmeleon genus myroxylon genus myrrhis genus myrsine genus myrtillocactus genus myrtus genus mysis genus mytilus genus myxine genus myxinikela genus myxocephalus genus nabalus genus naemorhedus genus nageia