Sigma Columbae

Sigma Columbae
Location of σ Columbae (circled in red)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 56m 20.943s
Declination −31° 22′ 56.780″
Apparent magnitude (V) 5.51
Characteristics
Spectral type F2 III
B−V color index +0.39
Astrometry
Radial velocity (Rv)+19.4±2.9 km/s
Proper motion (μ) RA: +0.692 mas/yr
Dec.: +6.510 mas/yr
Parallax (π)2.2952±0.0438 mas
Distance1,420 ± 30 ly
(436 ± 8 pc)
Absolute magnitude (MV)−2.98
Details
Mass3.79 M☉
Luminosity1,312 L☉
Surface gravity (log g)2.02 cgs
Temperature6,820 K
Metallicity [Fe/H]−0.91 dex
Rotational velocity (v sin i)73.4±3.7 km/s
Age400 Myr
Other designations
σ Col, CD−31°2848, FK5 2454, GC 7499, HD 40248, HIP 28098, HR 2092, SAO 196330
Database references
SIMBADdata

Sigma Columbae is a solitary, yellow-white hued star in the southern constellation of Columba. Its name is a Bayer designation that is Latinized from σ Columbae, and abbreviated Sigma Col or σ Col. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.51. Based upon an annual parallax shift of 2.3 mas as seen from Earth, this star is located at a distance of approximately 1,420 light years from the Sun.

At an age of about 400 million years, the spectrum of this star suggests this is an evolved F-type giant with a stellar classification of F2 III. It is spinning with a projected rotational velocity of about 74 km/s, which is giving the star an oblate shape with an equatorial bulge that is 10% larger than the polar radius. It has 3.79 times the mass of the Sun and is radiating 1,312 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 6,820 K.

References

  1. 1 2 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 XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875 Gaia DR3 record for this source at VizieR.
  3. 1 2 3 Høg, E.; et al. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27, Bibcode:2000A&A...355L..27H.
  4. 1 2 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
  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. 1 2 3 4 5 6 Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
  7. 1 2 McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  8. 1 2 3 4 Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
  9. ↑ "sig Col", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-08-28.
  10. ↑ 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.
  11. ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv:1204.2572, Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID 119273474.