Radio star

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Type of stellar object

title: "Radio star" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["star-types", "radio-stars-(astronomy)"] description: "Type of stellar object" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Radio_star" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Type of stellar object ::

Stellar radio sources, radio source stars or radio stars are stellar objects that produce copious emissions of various radio frequencies, whether constant or pulsed. Radio emissions from stars can be produced in many varied ways.

Among neutron stars

Pulsars, a type of neutron star, are examples of radio stars.{{cite web | title = About Pulsars | publisher = Jodrell Bank Centre for Astrophysics | date = 2008-12-23 | url = https://www.jb.man.ac.uk/research/pulsar/Education/index.html | access-date = 2009-01-22

Aside from pulsars, another type of neutron star is also characterized by radio emissions: the rotating radio transient (RRAT). As suggested by the name, the radio emission is erratic.

Quasars are not radio stars

Quasars (quasi-stellar radio sources) are not radio stars. They also emit radio frequencies, but from the effects of supermassive black holes at the centre of galaxies. Although they appear to be stars, they are not stars, but the hyperactive heart of a galaxy.

By other stellar objects

;Astrophysical masers Some late-type stars can produce astrophysical masers from their atmospheres and beam out coherent bursts of microwaves.

;The Sun The Sun, the nearest star to Earth, is known to emit radio waves, though it is virtually the only regular star that has been detected in the radio spectrum, because it is so close. It is not considered a radio star because it is not a strong radio source.

;Main-sequence stars in general Some studies have found that main-sequence stars may extremely rarely emit radio waves. A 2009 survey found a maximum of 112 candidate radio stars cross-matching the FIRST and NVSS surveys, but estimated that 108 ± 13 of the samples are from "contamination" from background sources. They estimate that less than 1.2 in 1 million stars between an apparent magnitude of 15 and 19.1 emit more than 1.25 mJy in the 21-centimeter band.

;Fast radio bursts ::figure[src="https://upload.wikimedia.org/wikipedia/commons/b/bb/FRB_locations.jpg"] ::

Fast radio bursts (FRB) are hypothesized to originate from extra-galactic sources. These bright, brief emissions of ~1 GHz radio occur at the rate of 104 per day across the sky, and no emission counterparts have been found in other bands. An alternative scenario is that FRBs are emitted as the result of flare activity on nearby stars within a kiloparsec of the Sun. This would make it easier to explain the luminosity of these events.{{cite journal | title=Fast radio bursts may originate from nearby flaring stars | display-authors=1 | last1=Loeb | first1=Abraham | last2=Shvartzvald | first2=Yossi | last3=Maoz | first3=Dan | journal=Monthly Notices of the Royal Astronomical Society: Letters | volume=439 | issue=1 | pages=L46–L50 | date=March 2014 | doi=10.1093/mnrasl/slt177 | doi-access=free | bibcode=2014MNRAS.439L..46L | arxiv=1310.2419 | s2cid=27504949 }}

;Red dwarfs In 2020, 10 days before reports about BLC1 – reported to be an apparent possible radio signal from Proxima Centauri, astronomers reported "a bright, long-duration optical flare, accompanied by a series of intense, coherent radio bursts" from the nearest star to the Sun. They state that it constitutes the "most compelling detection of a solar-like radio burst from another star to date" and strongly indicates a causal relationship between these emissions.

Like BLC1, the signal was recorded in April and May 2019. Despite this, their finding has not been put in direct relation to the BLC1 signal by scientists or media outlets as of January 2021 but implies that planets around Proxima Centauri and other red dwarfs are likely to be rather uninhabitable for humans and other currently known organisms.

References

References

  1. IEEE Canada, [http://www.ieee.ca/millennium/aro/ARO_found.html What has radio astronomy found?], National Research Council of Canada (accessed 11 September 2009)
  2. (10 August 2009). "A Sample of Candidate Radio Stars in FIRST and SDSS". The Astrophysical Journal.
  3. "Space weather discovery puts 'habitable planets' at risk". phys.org.
  4. "Space weather in Proxima's vicinity dims hopes of habitable worlds {{!}} EarthSky.org". earthsky.org.
  5. (2020). "A Flare-type IV Burst Event from Proxima Centauri and Implications for Space Weather". [[The Astrophysical Journal]].

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star-typesradio-stars-(astronomy)