Kappa Trianguli Australis

Kappa Trianguli Australis (κ Trianguli Australis) is a star in the constellation Triangulum Australe.

κ Trianguli Australis
Location of κ Trianguli Australis (circled)
Observation data
Epoch J2000.0      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
Distance1,200 ± 100 ly
(370 ± 40 pc)
Absolute magnitude (MV)−2.71[6]
Details
Mass7.0[7] M☉
Luminosity1,761[8] L☉
Surface gravity (log g)1.90[9] cgs
Temperature4,658[10] K
Metallicity [Fe/H]+0.21[9] dex
Rotational velocity (v sin i)7.7±1.0[10] km/s
Age55.2[7] Myr
Other designations
κ TrA, CPD−68° 2585, FK5 3253, HD 141767, HIP 77982, HR 5891, SAO 253342[11]
Database references
SIMBADdata

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.[12]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Cousins, A. W. J. (1977), "UCBV Magnitudes and Colours of South Circumpolar Stars", South African Astronomical Observatory Circulars, 1: 51, Bibcode:1977SAAOC...1...51C.
  3. 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.
  4. "Kap TrA". The International Variable Star Index. AAVSO – American Association of Variable Star Observers. Retrieved 18 September 2018.
  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, A61.
  6. 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.
  7. 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: 190. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
  8. 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.
  9. Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497.
  10. Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: 31, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, A116.
  11. "kap TrA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-29.
  12. Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331: 45. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x.
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