Theta Doradus
Star in the constellation Dorado
Theta Doradus , Latinized from θ Doradus , is a solitary[10] star in the southern constellation of Dorado . Based upon an annual parallax shift of 6.64 mas as seen from Earth, it is located around 490 light years from the Sun . With an apparent visual magnitude of +4.82,[2] the star is bright enough to be faintly visible to the naked eye.
This is an evolved orange-hued K-type giant star with a stellar classification of K2/3 III CNIb/II ,[3] where the suffix indicates it is a chemically peculiar star with a strong CN band .[11] With an age of around 1.17 billion years,[6] it has an estimated 2.23[6] times the mass of the Sun and has expanded to about 16[7] times the Sun's radius . It is radiating 426.6 times the solar luminosity from its photosphere at an effective temperature of 4,320 K.[6]
Naming
In Chinese caused by adaptation of the European southern hemisphere constellations into the Chinese system, 夾白 (Jiá Bái ), meaning White Patches Attached , refers to an asterism consisting of θ Doradus and α Reticuli . Consequently, θ Doradus itself is known as 夾白一 (Jiá Bái yī , English: the First Star of White Patches Attached .)[12]
References
^ 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 Cousins, A. W. J.; Stoy, R. H. (1962), "Photoelectric magnitudes and colours of Southern stars", Royal Observatory Bulletin , 64 : 103, Bibcode :1962RGOB...64..103C .
^ 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 .
^ 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 , S2CID 59451347 , A61.
^ a b Flynn, C.; Mermilliod, J.-C. (October 1991), "On the DDO absolute magnitudes of K giants", Astronomy and Astrophysics , 250 (2): 400–406, Bibcode :1991A&A...250..400F .
^ a b c d e f g 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 Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (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 .
^ Zboril, M. (July 2009), "Metallicity and photospheric abundances in field GKM giants and dwarfs", Monthly Notices of the Royal Astronomical Society , 397 (1): 335–340, Bibcode :2009MNRAS.397..335Z , doi :10.1111/j.1365-2966.2009.14917.x .
^ "tet Dor" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2017-04-14 .{{cite web }}
: CS1 maint: postscript (link )
^ 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 .
^ Gray, C. Richard O.; Corbally, J. (2009), Stellar Spectral Classification , Princeton University Press , p. 278, ISBN 978-0691125114 .
^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 27 日