Beta Doradus

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Variable star in the constellation Dorado

title: "Beta Doradus" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["f-type-supergiants", "classical-cepheid-variables", "dorado", "bayer-objects", "durchmusterung-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects", "population-i-stars"] description: "Variable star in the constellation Dorado" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/Beta_Doradus" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Variable star in the constellation Dorado ::

| name = β Doradus | image = | image=Dorado constellation map.svg | float=center | width=260 | position=right | mark=Red circle.svg | mark_width=10 | mark_link=β Dor | x=371 | y=738 | caption=Location of β Doradus (circled) | epoch = J2000 | constell = Dorado | ra = | dec = | appmag_v = 3.46 to 4.08 | class = F4-G4Ia-II | u-b = +0.55 | b-v = +0.70 | r-i = +0.48 | variable = δ Cephei | radial_v = +7.2 | prop_mo_ra = +0.800 | prop_mo_dec = +9.458 | parallax = 3.14 | p_error = 0.16 | parallax_footnote = | absmag_v = | mass = | rotational_velocity = 0 | radius = | temperature = 5,445 | luminosity = 3,200 | gravity = 1.3 | metal_fe = –0.13 | age_myr = | names = | Simbad=bet+dor

Beta Doradus, Latinized from β Doradus, is the second brightest star in the southern constellation of Dorado. It is a Classical Cepheid variable, with an apparent magnitude that varies between 3.46 and 4.08. Based upon parallax measurements with the Hubble Space Telescope, it is located at a distance of 1040 ly from Earth.

Characteristics

::figure[src="https://upload.wikimedia.org/wikipedia/commons/e/e7/BetaDorLightCurve.png" caption="TESS]]'' data"] ::

Beta Doradus is a Cepheid variable that regularly changes magnitude from a low of 4.08 to a high of 3.46 over a period of 9.84318 days. The light curve of this magnitude change follows a nearly regular saw-tooth pattern, with average amplitude variations period to period about 0.005 magnitude from average amplitude of 0.62 magnitude. During each radial pulsation cycle, the radius of the star varies by around a mean of . Its spectral type and luminosity class are likewise variable, from F-type to G-type and from a supergiant to a bright giant.

Far ultraviolet emissions have been detected from this star with the Far Ultraviolet Spectroscopic Explorer, while X-ray emissions were detected with the XMM-Newton space telescope. The X-ray luminosity is about 1 × 1029 erg/s and the emission varies with the pulsation period, suggesting a connection with the pulsation process. The peak X-ray emissions are in the 0.6–0.8 keV energy range, which occurs for plasmas with temperatures of 7–10 million K.

References

References

  1. (2021). "TESS Observations of Cepheid Stars: First Light Results". The Astrophysical Journal Supplement Series.
  2. {{Cite Gaia DR2. 4757601523650165120
  3. (April 2007). "Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic Cepheid Variable Stars: Period-Luminosity Relations". Astronomical Journal.
  4. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute.
  5. Evans, D. S.. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". [[International Astronomical Union]].
  6. (April 1980). "The reddening of Beta Doradus". Journal of the Royal Astronomical Society of Canada.
  7. (August 1998). "The bright southern Cepheid beta Doradus: the radial velocity curve, distance and size". [[Monthly Notices of the Royal Astronomical Society]].
  8. (April 2010). "The PL calibration for Milky Way Cepheids and its implications for the distance scale". Astrophysics and Space Science.
  9. (September 2008). "The influence of chemical composition on the properties of Cepheid stars. II. The iron content". Astronomy and Astrophysics.
  10. (May 2009). "Future Directions in Ultraviolet Spectroscopy: A Conference Inspired by the Accomplishments of the Far Ultraviolet Spectroscopic Explorer Mission".
  11. "V* bet Dor".
  12. "Beta Doradus". [[University of Illinois]].
  13. bet Dor, database entry, [http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars] {{Webarchive. link. (2017-06-20 , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 9, 2008.)
  14. CDS]] ID [https://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line September 9, 2008.
  15. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". [[Monthly Notices of the Royal Astronomical Society]].

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

f-type-supergiantsclassical-cepheid-variablesdoradobayer-objectsdurchmusterung-objectshenry-draper-catalogue-objectshipparcos-objectsbright-star-catalogue-objectspopulation-i-stars