Astronomy:Kappa Trianguli Australis
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Short description: Variable star in the constellation Triangulum Australe
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Triangulum Australe |
| Right ascension | 15h 55m 29.59831s[1] |
| Declination | −68° 36′ 10.8101″[1] |
| Apparent magnitude (V) | +5.08[2] |
| Characteristics | |
| Spectral type | G3/5 Ib[3] |
| B−V color index | +1.12[2] |
| Variable type | suspected SRD[4] |
| Astrometry | |
| Radial velocity (Rv) | +3.9±0.3[5] km/s |
| Proper motion (μ) | RA: −9.36[1] mas/yr Dec.: −6.79[1] mas/yr |
| Parallax (π) | 2.70 ± 0.26[1] mas |
| Distance | 1,200 ± 100 ly (370 ± 40 pc) |
| Absolute magnitude (MV) | −2.71[6] |
| Details | |
| Mass | 7.0[7] M☉ |
| Luminosity | 1,761[8] L☉ |
| Surface gravity (log g) | 1.90[9] cgs |
| Temperature | 4,658[10] K |
| Metallicity [Fe/H] | +0.21[9] dex |
| Rotational velocity (v sin i) | 7.7±1.0[10] km/s |
| Age | 55.2[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Trianguli Australis (κ Trianguli Australis) is a star in the constellation Triangulum Australe.
Kappa Trianguli Australis is a yellow G-type supergiant with an apparent magnitude of +5.08. It is around 1,200 light years from Earth.
It is not generally listed as a variable star but Hipparcos photometry showed small amplitude brightness changes. The dominant period was around 600 days and the amplitude less than a hundredth of a magnitude.[13]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 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 Cousins, A. W. J. (1977), "UCBV Magnitudes and Colours of South Circumpolar Stars", South African Astronomical Observatory Circulars 1: 51, Bibcode: 1977SAAOC...1...51C.
- ↑ Houk, N.; Cowley, A. P. (1975), "University of Michigan Catalogue of two-dimensional spectral types for the HD stars", University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0 1, Bibcode: 1975mcts.book.....H.
- ↑ "Kap TrA". The International Variable Star Index. AAVSO – American Association of Variable Star Observers. https://www.aavso.org/vsx/index.php?view=detail.top&oid=286474.
- ↑ 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.
- ↑ 7.0 7.1 Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (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.
- ↑ 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.
- ↑ 9.0 9.1 Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics 591: A118. doi:10.1051/0004-6361/201628497. Bibcode: 2016A&A...591A.118S.
- ↑ 10.0 10.1 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.
- ↑ "kap TrA". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=kap+TrA.
- ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats.
- ↑ Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society 331 (1): 45–59. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K.
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