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Star in the constellation Tucana
Eta Tucanae , Latinized from η いーた binary star [6] constellation of Tucana , a few degrees to the north of Epsilon Tucanae . It is visible to the naked eye as a dim, white-hued point of light with an apparent visual magnitude of +5.00.[2] parallax measurements provide a distance estimate of about 154 light years from the Sun, and it is drifting further away with a mean radial velocity of +32.5 km/s.[4] Tucana-Horologium association of co-moving stars.[6] [2]
The radial velocity for Eta Tucanae displays strong oscillations, suggesting this is a spectroscopic binary system. A companion was directly detected in 2014, but this result has some unexplained anomalies.[6] A-type main-sequence star with a stellar classification of A1V.[2] projected rotational velocity of 190 km/s,[6] [11] [6] mass of the Sun and 1.8[7] Sun's radius . It is radiating 23[8] luminosity of the Sun from its photosphere at an effective temperature of 9,057 K.[8]
^ a b c d e Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source at VizieR .^ a b c d e Ehrenreich, D.; et al. (November 2010), "Deep infrared imaging of close companions to austral A- and F-type stars", Astronomy and Astrophysics 523 : A73, arXiv :1007.0002 Bibcode :2010A&A...523A..73E , doi :10.1051/0004-6361/201014763 , S2CID 54913363 ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers . 42 (2): 443. Bibcode :2014JAVSO..42..443M . Vizier catalog entry ^ a b Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten . 328 (9): 889. arXiv :0705.0878 Bibcode :2007AN....328..889K . doi :10.1002/asna.200710776 . S2CID 119323941 . ^ 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 . S2CID 119257644 . Vizier catalog entry ^ a b c d e f g Borgniet, S.; Lagrange, A. -M.; Meunier, N.; Galland, F. (March 2017). "Extrasolar planets and brown dwarfs around AF-type stars. IX. The HARPS southern sample". Astronomy & Astrophysics . 599 : 26. arXiv :1608.08257 Bibcode :2017A&A...599A..57B . doi :10.1051/0004-6361/201628805 . S2CID 118723455 . A57. ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics . 352 : 555–562. arXiv :astro-ph/9911002 Bibcode :1999A&A...352..555A . Vizier catalog entry ^ a b c d Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics . 537 : A120. arXiv :1201.2052 Bibcode :2012A&A...537A.120Z . doi :10.1051/0004-6361/201117691 . S2CID 55586789 . Vizier catalog entry ^ David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal . 804 (2): 146. arXiv :1501.03154 Bibcode :2015ApJ...804..146D . doi :10.1088/0004-637X/804/2/146 . S2CID 33401607 . Vizier catalog entry ^ "eta Tuc" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-08-28 .{{cite web }}: CS1 maint: postscript (link )^ van Belle, Gerard T. (March 2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review . 20 (1): 51. arXiv :1204.2572 Bibcode :2012A&ARv..20...51V . doi :10.1007/s00159-012-0051-2 . S2CID 119273474 .
