Astronomy:Kappa Columbae

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Short description: Star in the constellation Columba
κ Columbae
Observation data
Equinox J2000.0]] (ICRS)
Constellation Columba
Right ascension  06h 16m 33.13512s[1]
Declination −35° 08′ 25.8630″[1]
Apparent magnitude (V) 4.37[2]
Characteristics
Spectral type K0.5 IIIa[3]
U−B color index +0.83[2]
B−V color index +1.00[2]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv)24.20[3] km/s
Proper motion (μ) RA: −0.28[1] mas/yr
Dec.: +87.94[1] mas/yr
Parallax (π)17.87 ± 0.16[1] mas
Distance183 ± 2 ly
(56.0 ± 0.5 pc)
Absolute magnitude (MV)+0.63[5]
Details[3]
Mass1.76 M☉
Radius10.5[6] R☉
Luminosity57.5 L☉
Surface gravity (log g)2.59 cgs
Temperature4,876±33 K
Metallicity [Fe/H]+0.11 dex
Age1.68 Gyr
Other designations
κ Col, CD−35° 2800, FK5 238, HD 43785, HIP 29807, HR 2256, SAO 196643.[7]
Database references
SIMBADdata

Kappa Columbae, Latinized from κ Columbae, is a solitary[8] star in the southern constellation of Columba. It has an apparent visual magnitude of 4.37,[2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 17.87 mas,[1] it is located at a distance of 183 light years from the Sun. It has a peculiar velocity of 20.2±1.9 km/s, making it a candidate runaway star.[9]

This is an evolved K-type giant star with a stellar classification of K0.5 IIIa.[3] The measured angular diameter of this star, after correction for limb darkening, is 1.75±0.03 mas.[10] At the estimated distance of this star, this yields a physical size of about 10.5 times the radius of the Sun.[6] It has an estimated 1.76 times the mass of the Sun and is about 1.7 billion years old. The star radiates 57.5 times the solar luminosity from its outer atmosphere at an effective temperature of 4,876 K.[3] It is catalogued as a suspected variable star.[4]

In Chinese, 孫 (Sūn), meaning Grandson, refers to an asterism consisting of κ Columbae and θ Columbae.[11] Consequently, κ Columbae itself is known as 孫一 (Sūn yī, English: the First Star of Grandson.).[12]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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. 
  2. ↑ 2.0 2.1 2.2 2.3 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1999), "UBVRIJKL photometry of the bright stars", Commission Lunar and Planetary Laboratory 4: 99, Bibcode: 1966CoLPL...4...99J. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L. 
  4. ↑ 4.0 4.1 Samus, N. N. et al. (2004), Combined General Catalogue of Variable Stars (GCVS4.2), http://cdsarc.u-strasbg.fr/viz-bin/Cat?II/250, retrieved 2016-12-26. 
  5. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. . The radius (R*) is given by:
    [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(56.0\cdot 1.75\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 21.1\cdot R_{\bigodot} \end{align} }[/math]
  7. ↑ "kap Col -- Variable Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=kap+Col, retrieved 2016-12-25. 
  8. ↑ 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. 
  9. ↑ Tetzlaff, N. et al. (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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T. 
  10. ↑ Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R. 
  11. ↑ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN:978-986-7332-25-7.
  12. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 16 日



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