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Star in the constellation Tucana
Iota Tucanae (ι Tuc, ι Tucanae) is a solitary[ 10] star in the southern constellation of Tucana . Based upon an annual parallax shift of 10.72 mas as seen from Earth,[ 2] light years from the Sun . With an apparent visual magnitude of +5.33,[ 3]
This is a yellow-hued G-type giant star with a stellar classification of G5 III.[ 4] semiregular variable star, showing a periodicity of 66.8 days with an amplitude of 0.0202 in visual magnitude.[ 11] X-ray source with a luminosity of × 1028 erg s−1 [ 12] [ 5] mass of the Sun , and, at the age of 1.69 billion years,[ 5] evolved away from the main sequence , expanding to 11[ 7] Sun's radius . The star radiates 65[ 5] solar luminosity from its photosphere at an effective temperature of 5,039 K.[ 5]
^ "/ftp/cats/more/HIP/cdroms/cats" . Centre de Données astronomiques de Strasbourg . Strasbourg astronomical Data Center. Retrieved 15 October 2022 .^ a b c d e f 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 , S2CID 18759600 . ^ a b c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa , 27 : 11, Bibcode :1968MNSSA..27...11C . ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode :1978mcts.book.....H . ^ a b c d e f g h i j Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal , 150 (3): 23, arXiv :1507.01466 Bibcode :2015AJ....150...88L , doi :10.1088/0004-6256/150/3/88 , S2CID 118505114 , 88. ^ a b 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 . ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics , 367 (3rd ed.): 521–524, arXiv :astro-ph/0012289 Bibcode :2001A&A...367..521P , doi :10.1051/0004-6361:20000451 , S2CID 425754 . ^ a b Alves, S.; et al. (April 2015), "Determination of the spectroscopic stellar parameters for 257 field giant stars", Monthly Notices of the Royal Astronomical Society , 448 (3): 2749–2765, arXiv :1503.02556 Bibcode :2015MNRAS.448.2749A , doi :10.1093/mnras/stv189 ^ "iot Tuc -- Long-period variable star" , SIMBAD Astronomical Database , Centre de Données astronomiques de Strasbourg , retrieved 2017-04-22 .^ 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 . ^ Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society , 331 (1): 45–59, arXiv :astro-ph/0112194 Bibcode :2002MNRAS.331...45K , doi :10.1046/j.1365-8711.2002.05150.x S2CID 10505995 . ^ Pizzolato, N.; et al. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", Astronomy and Astrophysics , 361 : 614–628, Bibcode :2000A&A...361..614P .
