Star in the constellation Tucana
Eta Tucanae ,Latinized from η Tucanae, is a probablebinary star [ 6] constellation ofTucana , a few degrees to the north ofEpsilon Tucanae . It is visible to the naked eye as a dim, white-hued point of light with anapparent 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 meanradial 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 aspectroscopic binary system. A companion was directly detected in 2014, but this result has some unexplained anomalies.[ 6] A-type main-sequence star with astellar 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 itsphotosphere at aneffective 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 atVizieR .^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 . Retrieved2019-08-28 .{{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 .
