Astronomy:Sigma Columbae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 05h 56m 20.94287s[1] |
| Declination | −31° 22′ 56.7846″[1] |
| Apparent magnitude (V) | 5.51[2] |
| Characteristics | |
| Spectral type | F2 III[3] |
| B−V color index | +0.39[2] |
| Astrometry | |
| Radial velocity (Rv) | +19.4±2.9[4] km/s |
| Proper motion (μ) | RA: +0.08[1] mas/yr Dec.: +6.04[1] mas/yr |
| Parallax (π) | 1.96 ± 0.24[1] mas |
| Distance | approx. 1,700 ly (approx. 510 pc) |
| Absolute magnitude (MV) | −2.98[5] |
| Details | |
| Mass | 3.79[6] M☉ |
| Luminosity | 1,312[7] L☉ |
| Surface gravity (log g) | 2.02[6] cgs |
| Temperature | 6,820[8] K |
| Metallicity [Fe/H] | −0.91[6] dex |
| Rotational velocity (v sin i) | 73.4±3.7[8] km/s |
| Age | 400[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Sigma Columbae, Latinized from σ Columbae, is a solitary,[10] yellow-white hued star in the southern constellation of Columba. It is faintly visible to the naked eye with an apparent visual magnitude of 5.51.[2] Based upon an annual parallax shift of 1.96 mas as seen from Earth,[1] this star is located roughly 1,700 light years from the Sun.
At an age of about 400 million years,[6] the spectrum of this star suggests this is an evolved F-type giant with a stellar classification of F2 III.[3] It is spinning with a projected rotational velocity of about 74 km/s,[8] which is giving the star an oblate shape with an equatorial bulge that is 10% larger than the polar radius.[11] It has 3.79[6] times the mass of the Sun and is radiating 1,312[7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 6,820 K.[8]
References
- ↑ 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.
- ↑ 2.0 2.1 2.2 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.
- ↑ 3.0 3.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ↑ 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 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, doi:10.1051/0004-6361/201016276, Bibcode: 2011A&A...530A.138C.
- ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 8.0 8.1 8.2 8.3 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, doi:10.1051/0004-6361/201118724, Bibcode: 2012A&A...542A.116A.
- ↑ "sig Col". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=sig+Col.
- ↑ 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.
- ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V.
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