Astronomy:Delta Columbae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 22m 06.82831s[1] |
| Declination | −33° 26′ 11.0323″[1] |
| Apparent magnitude (V) | 3.85[2] |
| Characteristics | |
| Spectral type | G7 II[3] |
| U−B color index | +0.52[2] |
| B−V color index | +0.88[2] |
| Astrometry | |
| Proper motion (μ) | RA: −24.23[1] mas/yr Dec.: −51.40[1] mas/yr |
| Parallax (π) | 13.94 ± 0.51[1] mas |
| Distance | 234 ± 9 ly (72 ± 3 pc) |
| Absolute magnitude (MV) | −0.32[4] |
| Orbit[5][6] | |
| Period (P) | 868.78 d |
| Semi-major axis (a) | 9.02±0.52 mas |
| Eccentricity (e) | 0.7 |
| Inclination (i) | 116.3±4.2° |
| Periastron epoch (T) | 2419915.02 JD |
| Argument of periastron (ω) (secondary) | 117.1° |
| Semi-amplitude (K1) (primary) | 10.6 km/s |
| Details | |
| δ Col A | |
| Luminosity | 149.5[7] L☉ |
| Surface gravity (log g) | 2.49[8] cgs |
| Temperature | 5,136[4] K |
| Metallicity [Fe/H] | −0.04[8] dex |
| Rotational velocity (v sin i) | 4.8±0.2[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Columbae is a binary star system in the constellation Columba. It can be seen with the naked eye having an apparent visual magnitude of 3.85.[2] The distance to this system, based upon an annual parallax shift of 13.94 mas,[1] is around 234 lightyears.
Delta Columbae was a latter designation of 3 Canis Majoris, as the early astronomers Johann Bayer and John Flamsteed did not include the constellation Columba in their star charts.[10] It has the uncommon traditional name Ghusn al Zaitun, from the Arabic الغصن الزيتون al-ghuşn al-zaitūn "the olive branch" (carried by the dove of Noah's Ark).[citation needed]
This is a single-lined spectroscopic binary system with an orbital period of 868.78 days and an eccentricity of 0.7.[5] It has a peculiar velocity of 30.2±3.9 km/s, making it a candidate runaway star system. The primary component is a G-type bright giant star with a stellar classification of G7 II.[3] It radiates around 149[7] time the solar luminosity from its outer atmosphere at an effective temperature of 5,136 K.[4]
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 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.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 4.2 4.3 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.
- ↑ 5.0 5.1 Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I. et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics 424 (2): 727–732, doi:10.1051/0004-6361:20041213, Bibcode: 2004A&A...424..727P.
- ↑ Jancart, S. et al. (October 2005), "Astrometric orbits of SB9 stars", Astronomy and Astrophysics 442 (1): 365–380, doi:10.1051/0004-6361:20053003, Bibcode: 2005A&A...442..365J.
- ↑ 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 Luck, R. Earle (2014), "Parameters and Abundances in Luminous Stars", The Astronomical Journal 147 (6): 137, doi:10.1088/0004-6256/147/6/137, Bibcode: 2014AJ....147..137L.
- ↑ "del Col -- Spectroscopic binary", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=del+Col, retrieved 2016-12-21.
- ↑ Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy 18 (3): 209–223, doi:10.1177/002182868701800305, Bibcode: 1987JHA....18..209W.
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