Surf Wiki
Save to docs
science/astronomy

From Surf Wiki (app.surf) — the open knowledge base

2 Centauri

Star in the constellation Centaurus

2 Centauri
Summary

Star in the constellation Centaurus

| b-v = +1.49 | u-b = +1.44

2 Centauri is a single star in the southern constellation of Centaurus, located approximately 183 light-years from Earth. It has the Bayer designation g Centauri; 2 Centauri is the Flamsteed designation. This object is visible to the naked eye as faint, red-hued star with an apparent visual magnitude of about 4.2. It is moving away from the Earth with a heliocentric radial velocity of +41 km/s. The star is a member of the HR 1614 supercluster.

A [[light curve]] for V806 Centauri. The main plot shows the long term variability from ''[[Hipparcos]]'' data,<ref name=HipDataAccess/> and the inset plot shows the variability over the 26.5 day period, using data from Tabur ''et al.'' (2009).<ref name=&quot;Tabur&quot;/> The green curve shows the best-fit sine wave, which has an amplitude of 18 millimagnitudes.

This is an evolved red giant star with a stellar classification of M5 III. In 1951, Alan William James Cousins announced that the star, then called g Centauri, is a variable star. It was given its variable star designation, V806 Centauri, in 1978. It is classified as a semiregular variable star and its brightness varies from magnitude +4.16 to +4.26 with a period of 12.57 days. The star has around 82 times the Sun's radius and is radiating 767 times the Sun's luminosity from its enlarged photosphere at an effective temperature of .

References

References

  1. (May 2024). "Resolving Red Giant Winds with the Hubble Space Telescope*". The Astrophysical Journal.
  2. "2 Cen".
  3. (2023). "In the Trenches of the Solar-Stellar Connection. VII. Wilson-Bappu 2022". The Astrophysical Journal Supplement Series.
  4. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal.
  5. "Hipparcos Tools Interactive Data Access". ESA.
  6. Gontcharov, G. A.. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters.
  7. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data.
  8. (June 1998). "The HR 1614 Group and HIPPARCOS Astrometry". The Astronomical Journal.
  9. (September 2008). "A catalogue of multiplicity among bright stellar systems". [[Monthly Notices of the Royal Astronomical Society]].
  10. (September 2009). "Physical parameters of the semiregular variable red giant 2 Cen". Astrophysics.
  11. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey.
  12. (October 1951). "Photographic magnitudes of the brightest stars". The Observatory.
  13. (April 1978). "63rd Name-List of Variable Stars". Information Bulletin on Variable Stars.
  14. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics.
  15. (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society.
  16. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S.
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.

m-type-giants asymptotic-giant-branch-stars semiregular-variable-stars centaurus bayer-objects durchmusterung-objects flamsteed-objects henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects objects-with-variable-star-designations
Want to explore this topic further?

Ask Mako anything about 2 Centauri — get instant answers, deeper analysis, and related topics.

Research with Mako

Free with your Surf account

Content sourced from Wikipedia, available under CC BY-SA 4.0.

This content may have been generated or modified by AI. CloudSurf Software LLC is not responsible for the accuracy, completeness, or reliability of AI-generated content. Always verify important information from primary sources.

Report