polar ۱) قطبی؛ ۲) پلار 1) qotbi; 2) polâr Fr.: 1) polaire; 2) polar Of or pertaining to the pole of any sphere, a magnet, an electric cell, etc.
A subclass of → cataclysmic variables, the prototype
being AM Herculis. Polars are short-period systems in which a
→ late-type → main sequence star
transfers mass to a highly magnetized → white dwarf.
The strong magnetic field (10-70 million → gauss) prevents the
formation of an → accretion disk, locks both stars
in synchronous rotation and guides the accreting matter to accretion spots which are
the source of intense X-ray radiation (material impacts on to the white dwarf where it is
radiated away).
See also: 1) Adj. of → pole.
- From polar(ization) + (st)ar, because of their
→ circularly polarized light.
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