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・ Effect of Hurricane Katrina on the New Orleans Hornets
・ Effect of Hurricane Katrina on the New Orleans Saints
・ Effect of Hurricane Katrina on Tulane University
・ Effect of oxygen on chronic obstructive pulmonary disease
・ Effect of psychoactive drugs on animals
・ Effect of radiation on perceived temperature
・ Effect of Reality
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・ Effect of spaceflight on the human body
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・ EF Education First
・ EF English Live
・ EF English Proficiency Index
EF Eridani
・ EF hand
・ EF Language
・ EF San Pablo Tacachico
・ EF Standard English Test
・ Ef'al
・ Ef'al Regional Council
・ EF-5
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・ EF1 guanine nucleotide exchange domain
・ EF2000 (video game)
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EF Eridani : ウィキペディア英語版
EF Eridani


EF Eridani (abbreviated EF Eri, sometimes incorrectly referred to as EF Eridanus) is a variable star of the type known as polars, AM Herculis stars, or magnetic cataclysmic variable stars. Historically it has varied between apparent magnitudes 14.5 and 17.3, although since 1995 it has generally remained at the lower limit. The star system consists of a white dwarf with a substellar massed former star in orbit.
==EF Eridani B==
The substellar mass in orbit around the white dwarf is a star which lost all of its gas to the white dwarf, except what remains, a 0.05 solar mass () ball, which is too small to continue fusion, and does not have the composition of a super-planet, brown dwarf, or white dwarf. There is no category for such a stellar remnant.〔
It is theorized that 500 million years ago, the white dwarf started to cannibalize its partner, when they were separated by 7 million km. As it lost mass, the regular star spiralled inward, until now they are separated by a mere 700,000 km.
Another former star orbits the pulsar PSR J1719-1438.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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