Astronomy:2 Centauri

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Short description: Star in the constellation Centaurus

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2 Centauri
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A light curve for V806 Centauri. The main plot shows the long term variability from Hipparcos data,[1] and the inset plot shows the variability over the 26.5 day period, using data from Tabur et al. (2009).[2] The green curve shows the best-fit sine wave, which has an amplitude of 18 millimagnitudes.
Observation data
Equinox J2000.0]] (ICRS)
Constellation Centaurus
Right ascension  13h 49m 26.72175s[3]
Declination −34° 27′ 02.7929″[3]
Apparent magnitude (V) 4.19[4] (4.16–4.26)[5]
Characteristics
Spectral type M5 III[6]
U−B color index +1.44[7]
B−V color index +1.49[7]
Variable type SRb[5]
Astrometry
Radial velocity (Rv)+40.7±0.7[8] km/s
Proper motion (μ) RA: −41.68±0.23[3] mas/yr
Dec.: −59.77±0.18[3] mas/yr
Parallax (π)17.82 ± 0.21[3] mas
Distance183 ± 2 ly
(56.1 ± 0.7 pc)
Absolute magnitude (MV)+0.51[9]
Details
Radius82.4[10] R☉
Luminosity71.96[4] L☉
Temperature3,398[11] K
Other designations
g Centauri, 2 Cen, V806 Cen, CD−33°9358, GC 18666, HD 120323, HIP 67457, HR 5192, SAO 204875[12]
Database references
SIMBADdata

2 Centauri is a single[13] star in the southern constellation of Centaurus, located approximately 183 light-years from Earth.[3] It has the Bayer designation g Centauri;[12] 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 4.19.[4] It is moving away from the Earth with a heliocentric radial velocity of +41 km/s.[8] The star is a member of the HR 1614 supercluster.[14]

This is an evolved red giant star with a stellar classification of M5 III.[6] In 1951, Alan William James Cousins announced that the star, then called g Centauri, is a variable star.[15] It was given its variable star designation, V806 Centauri, in 1978.[16] It is classified as a semiregular variable star and its brightness varies from magnitude +4.16 to +4.26[5] with a period of 12.57 days.[17] The star has around 70[18] times the Sun's radius and is radiating 72[4] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,398 K.[11]

References

  1. ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access. 
  2. ↑ Tabur, V.; Bedding, T. R.; Kiss, L. L.; Moon, T. T.; Szeidl, B.; Kjeldsen, H. (2009). "Long-term photometry and periods for 261 nearby pulsating M giants". Monthly Notices of the Royal Astronomical Society 400 (4): 1945–1961. doi:10.1111/j.1365-2966.2009.15588.x. Bibcode: 2009MNRAS.400.1945T. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.  Vizier catalog entry
  4. ↑ 4.0 4.1 4.2 4.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  5. ↑ 5.0 5.1 5.2 Samus, N. N. et al. (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 1. Bibcode: 2009yCat....102025S. 
  6. ↑ 6.0 6.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H. 
  7. ↑ 7.0 7.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M. 
  8. ↑ 8.0 8.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  9. ↑ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics 430: 303–311, doi:10.1051/0004-6361:20041440, Bibcode: 2005A&A...430..303C. 
  10. ↑ Wood, Brian E.; Harper, Graham M.; Müller, Hans-Reinhard (May 2024). "Resolving Red Giant Winds with the Hubble Space Telescope*" (in en). The Astrophysical Journal 967 (2): 120. doi:10.3847/1538-4357/ad401f. ISSN 0004-637X. 
  11. ↑ 11.0 11.1 McDonald, I. et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–357, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M 
  12. ↑ 12.0 12.1 "2 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2+Cen. 
  13. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  14. ↑ Eggen, Olin J. (June 1998). "The HR 1614 Group and HIPPARCOS Astrometry". The Astronomical Journal 115 (6): 2453–2458. doi:10.1086/300380. Bibcode: 1998AJ....115.2453E. 
  15. ↑ Cousins, A. W. J. (October 1951). "Photographic magnitudes of the brightest stars". The Observatory 71: 201–202. Bibcode: 1951Obs....71..201C. https://ui.adsabs.harvard.edu/abs/1951Obs....71..201C/abstract. Retrieved 16 January 2025. 
  16. ↑ Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (April 1978). "63rd Name-List of Variable Stars". Information Bulletin on Variable Stars 1414: 1–10. Bibcode: 1978IBVS.1414....1K. https://ibvs.konkoly.hu/pub/ibvs/1401/1414.pdf. Retrieved 16 January 2025. 
  17. ↑ Ruban, E. V.; Arkharov, A. A.; Hagen-Thorn, E. I.; Novikov, V. V. (September 2009). "Physical parameters of the semiregular variable red giant 2 Cen". Astrophysics 52 (3): 383–394. doi:10.1007/s10511-009-9075-3. Bibcode: 2009Ap.....52..383R. 
  18. ↑ Pasinetti Fracassini, L. E. et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics 367: 521–524. doi:10.1051/0004-6361:20000451. Bibcode: 2001A&A...367..521P. 



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