Upsilon2_Centauri

Upsilon<sup>2</sup> Centauri

Upsilon2 Centauri

Binary star system in the constellation Centaurus

Upsilon2 Centauri (υ2 Centauri) is a binary star[6] system in the southern constellation Centaurus. It is visible to the naked eye with an apparent visual magnitude of +4.33.[2] Based upon an annual parallax shift of just 2.57 mas as seen from Earth,[1] this star is located roughly 1,300 light years from the Sun. Relative to its neighbors, the system has a peculiar velocity of 39.2+8.8
−15.2 km/s and it may form a runaway star system.[9]

For other stars with this Bayer designation, see υ Centauri.
Quick Facts Constellation, Right ascension ...

This is a single-lined spectroscopic binary star system with an orbital period of 207.357 days and an eccentricity of 0.55.[6] The primary component has the spectrum of an evolved F-type giant/bright giant hybrid with a stellar classification of F7 II/III.[3] It is around 46[9] million years old with 6.9 times the mass of the Sun. The star is radiating 3,919 times the Sun's luminosity from its photosphere at an effective temperature of 6,495 K.[7]

References

  1. [1]
    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.
  2. [2]
    Fernie, J. D. (1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7, Bibcode:1983ApJS...52....7F, doi:10.1086/190856.
  3. [3]
    Houk, N. (1987), "Michigan Catalogue of two dimensional spectral types for the HD stars", Michigan Spectral Survey, 2, Bibcode:1978mcts.book.....H.
  4. [4]
    Eggen, O. J. (July 1985), "Cepheids and nonvariable supergiants", Astronomical Journal, 90: 1260–1277, Bibcode:1985AJ.....90.1260E, doi:10.1086/113834.
  5. [5]
    de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. [6]
    Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
  7. [7]
    Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483.
  8. [8]
    Mallik, Sushma V.; et al. (October 2003), "Lithium and rotation in F and G dwarfs and subgiants", Astronomy and Astrophysics, 409: 251–261, Bibcode:2003A&A...409..251M, doi:10.1051/0004-6361:20031084.
  9. [9]
    Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
  10. [10]
    "ups02 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-29.
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