2 Centauri

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2 Centauri
V806CenLightCurve.png
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
Epoch J2000.0       Equinox J2000.0
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  mas [3]
Distance 183 ± 2  ly
(56.1 ± 0.7  pc)
Absolute magnitude  (MV)+0.51 [9]
Details
Radius 70 [10]   R☉
Luminosity 71.96 [4]   L☉
Temperature 3,398 [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
SIMBAD data

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] 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. [15] The star has around 70 [10] 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]

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References

  1. ↑ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  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. arXiv: 0908.3228 . Bibcode:2009MNRAS.400.1945T. doi: 10.1111/j.1365-2966.2009.15588.x .
  3. 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600. Vizier catalog entry
  4. 1 2 3 4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID   119257644.
  5. 1 2 3 Samus, N. N.; Durlevich, O. V.; 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. 1 2 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. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  8. 1 2 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  9. ↑ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv: astro-ph/0409683 , Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440, S2CID   12136256.
  10. 1 2 Pasinetti Fracassini, L. E.; et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics (Third ed.). 367: 521–524. arXiv: astro-ph/0012289 . Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID   425754.
  11. 1 2 McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv: 1208.2037 , Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID   118665352
  12. 1 2 "2 Cen". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-04-06.
  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. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID   14878976.
  14. ↑ Eggen, Olin J. (June 1998). "The HR 1614 Group and HIPPARCOS Astrometry". The Astronomical Journal. 115 (6): 2453–2458. Bibcode:1998AJ....115.2453E. doi: 10.1086/300380 .
  15. ↑ 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. Bibcode:2009Ap.....52..383R. doi:10.1007/s10511-009-9075-3. S2CID   121256121.
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