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A radio star (stellar radio source or radio source star) is a star that emits a lot of radio, either constant or pulsed. Different kinds of stars fit the criteria, including pulsars, and rotating radio transients, which are also a type of neutron star. Late-type stars may also produce masers. The Sun produces some radio waves but not enough to be commonly considered a radio star. Quasars are not stars, thus by definition, a quasar radio source is not a radio star.
The term radio star is somewhat old fashioned and now uncommon: in early radio astronomy, it was used for radio point sources, some of which were subsequently confirmed to be stars, but others to be active galactic nuclei (AGNs) such as quasars.