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Iota Tucanae

A light curve for Iota Tucanae, plotted from Hipparcos data [1]
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Tucana
Right ascension 01h 07m 18.66365s [2]
Declination −61° 46′ 31.0434″ [2]
Apparent magnitude (V) +5.33 [3]
Characteristics
Spectral type G5 III [4]
B−V color index +0.89 [3]
Variable type SRV [5]
Astrometry
Radial velocity (Rv)−7.80 [5] km/s
Proper motion (μ) RA: +73.80 [2]  mas/ yr
Dec.: −11.55 [2]  mas/ yr
Parallax (π)10.72 ± 0.23  mas [2]
Distance304 ± 7  ly
(93 ± 2  pc)
Absolute magnitude (MV)0.70 [6]
Details
Mass2.20 [5]  M☉
Radius11 [7]  R☉
Luminosity65 [5]  L☉
Surface gravity (log g)3.15±0.13 [8]  cgs
Temperature5,039±63 [5]  K
Metallicity [Fe/H]−0.02±0.08 [8]  dex
Rotational velocity (v sin i)5.8±3.5 [6] km/s
Age1.69 [5]  Gyr
Other designations
ι Tuc, CPD−62° 89, FK5 39, HD 6793, HIP 5268, HR 332, SAO 248324 [9]
Database references
SIMBAD data

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] it is located around 304  light years from the Sun. With an apparent visual magnitude of +5.33, [3] it is faintly visible to the naked eye.

This is a yellow-hued G-type giant star with a stellar classification of G5 III. [4] It is classified as a semiregular variable star, showing a periodicity of 66.8 days with an amplitude of 0.0202 in visual magnitude. [11] Iota Tucanae is an X-ray source with a luminosity of 817.6×1028 erg s−1. [12] It has an estimated 2.2 [5] times the mass of the Sun, and, at the age of 1.69 billion years, [5] it has evolved away from the main sequence, expanding to 11 [7] times the Sun's radius. The star radiates 65 [5] times the solar luminosity from its photosphere at an effective temperature of 5,039 K. [5]

References

  1. ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  2. ^ 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.
  3. ^ 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.
  4. ^ 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.
  5. ^ 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.
  6. ^ 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.
  7. ^ 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.
  8. ^ 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.
  9. ^ "iot Tuc -- Long-period variable star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-04-22.
  10. ^ 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.
  11. ^ 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.
  12. ^ 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.
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