| 词条 | Epsilon Tauri |
| 释义 |
| name = Epsilon Tauri }}{{Starbox image | image = | caption = The position of ε Tauri in the Taurus constellation. }}{{Starbox observe | epoch = J2000 | constell = Taurus | ra = {{RA|04|28|37.00}}[1] | dec = {{DEC|+19|10|50}}[1] | appmag_v = +3.53[3] }}{{Starbox character | class = K0III[3] | b-v = 1.014[1] | u-b = | variable = }}{{Starbox astrometry | radial_v = | prop_mo_ra = 106.19 ± 0.38[1] | prop_mo_dec = -37.84 ± 0.30[1] | parallax = 22.24 | p_error = 0.25 | parallax_footnote =[1] | absmag_v = 0.145[9] }}{{Starbox detail | mass=2.7 ± 0.1[3] | radius = 12.692 ± 0.545 [1] | luminosity=97 ± 8 | temperature=4901 ± 20[3] | metal_fe=+0.17 ± 0.04[3] | rotational_velocity=3.0[9] | rotation= | age_myr=625[3]{{Starbox catalog | names = 74 Tau, Ain, Oculus Boreus,[17] BD+18°640, CCDM J04286+1911, FK5 164, GC 5430, HD 28305, HIP 20889, HR 1409, SAO 93954 }}{{Starbox reference | Simbad = HD+28305 }}{{Starbox end}} Epsilon Tauri (ε Tauri, abbreviated Epsilon Tau, ε Tau), also named Ain,[2] is an orange giant star located approximately 45 parsecs (147 light-years) from the Sun in the constellation of Taurus.[3] An extrasolar planet (designated Epsilon Tauri b, later named Amateru) is believed to be orbiting the star. It is a member of the Hyades open cluster. As such its age is well constrained at 625 million years. It is claimed to be the heaviest among planet-harboring stars with reliable initial masses although the star HD 13189 is potentially more massive.[3] Given its large mass, this star, though presently of spectral type K0 III, was formerly of spectral type A that has now evolved off the main sequence into the giant phase. It is regarded as a red clump giant; that is, a core-helium burning star. Since Epsilon Tauri lies near the plane of the ecliptic, it is sometimes occulted by the Moon and (very rarely) by planets. It has an 11th magnitude companion 182 arcseconds from the primary. Nomenclatureε Tauri (Latinised to Epsilon Tauri) is the star's Bayer designation; it also bears the Flamsteed designation of 74 Tauri. On discovery the planet was designated Epsilon Tauri b (or Ain b). The star bore the traditional name Ain (Arabic عين for "eye") and was given the name Oculus Boreus (Latin for "Northern eye") by John Flamsteed.[4][5] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[6] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[7] included a table of the first two batches of names approved by the WGSN; which included Ain for this star. In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets.[8] The process involved public nomination and voting for the new names.[9] In December 2015, the IAU announced the winning name was Amateru for this planet.[10] The winning name was based on that submitted by the Kamagari Astronomical Observatory of Kure, Hiroshima Prefecture, Japan: namely 'Amaterasu', the Shinto goddess of the Sun, born from the left eye of the god Izanagi. The IAU substituted 'Amateru' – which is a common Japanese appellation for shrines when they enshrine Amaterasu – because 'Amaterasu' is already used for an asteroid (10385 Amaterasu).[11] In Chinese, {{lang|zh|畢宿}} ({{lang|zh-Latn|Bì Xiù}}), meaning Net, refers to an asterism consisting ε Tauri, δ3 Tauri, δ1 Tauri, γ Tauri, Aldebaran, θ2 Tauri, 71 Tauri and λ Tauri.[12] Consequently, ε Tauri itself is known as {{lang|zh|畢宿一}} ({{lang|zh-Latn|Bì Xiù yī}}), "the First Star of Net".[13] Planetary systemIn 2007 a massive extrasolar planet was reported orbiting the star with a period of 1.6 years in a somewhat eccentric orbit. Its discoverers claimed it was the first planet ever discovered in an open cluster. {{OrbitboxPlanet begin| table_ref = }}{{OrbitboxPlanet | exoplanet = b (Amateru) | mass = >7.6 (± 0.2) | period = 594.9 (± 5.3) | semimajor = 1.93 (± 0.03) | eccentricity = 0.151 (± 0.023) }}{{Orbitbox end}} In popular cultureEpislon Tauri is a major feature of the book Starsong Chronicles:Exodus, by American author JJ Clayborn. In the book the star is referenced by the name Ain, but the characters rename the star Coronis.[36] References1. ^{{cite journal | url=http://www.iop.org/EJ/abstract/0004-637X/694/2/1085/ | author=Gerard T. van Belle and Kaspar von Braun | title=Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars | journal=The Astrophysical Journal | volume=694 | issue=2 | year=2009 | pages=1085–1098 | format=abstract | doi=10.1088/0004-637X/694/2/1085 | bibcode=2009ApJ...694.1085V|arxiv = 0901.1206 }}([https://arxiv.org/abs/0901.1206 web Preprint]) [14][15][16][17]2. ^{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt | title=IAU Catalog of Star Names |accessdate=28 July 2016}} 3. ^{{cite web | title=Notes for planet HD 13189 b | work=The Extrasolar Planets Encyclopaedia | url=http://exoplanet.eu/catalog/hd_13189_b/ | accessdate=2015-09-15}} 4. ^{{cite book |first=John |last=Flamsteed |title=Historia Coelestis Britannica |url=https://books.google.com/books?id=4K9FAAAAcAAJ|publisher=H. Meere |date=1725 |page=47}} 5. ^1 {{cite book |first=Richard Hickley |last=Allen |title=Star Names – Their Lore and Meaning |url=http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Taurus*.html |publisher=Dover Books|date=1963 |page=391}} 6. ^{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|accessdate=22 May 2016}} 7. ^{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/WGSN_bulletin1.pdf | title=Bulletin of the IAU Working Group on Star Names, No. 1 |accessdate=28 July 2016}} 8. ^NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014 9. ^NameExoWorlds The Process 10. ^Final Results of NameExoWorlds Public Vote Released, International Astronomical Union, 15 December 2015. 11. ^NameExoWorlds The Approved Names 12. ^{{zh icon}} 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}. 13. ^{{zh icon}} 香港太空館 – 研究資源 – 亮星中英對照表 {{webarchive|url=https://web.archive.org/web/20081025110153/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ala_alz.htm |date=2008-10-25 }}, Hong Kong Space Museum. Accessed on line November 23, 2010. 14. ^1 2 3 4 5 6 {{cite web | title=Entry for star HIP 20889 | work=Vizier Catalogue Service | url=http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=20836 | accessdate=2015-09-13}} 15. ^1 2 3 4 5 6 7 {{cite web | title=Notes for planet eps Tau b | work=The Extrasolar Planets Encyclopaedia | url=http://exoplanet.eu/catalog/eps_tau_b/ | accessdate=2015-09-13}} 16. ^1 2 {{citation | title=Ultraviolet Emission Lines in BA and Non-BA Giants | display-authors=1 | last1=Böhm-Vitense | first1=Erika | last2=Carpenter | first2=Kenneth G. | last3=Robinson | first3=Richard D. | journal=The Astrophysical Journal | postscript=. | volume=545 | issue=2 | pages=992–999 | date=December 2000 | doi=10.1086/317850 | bibcode=2000ApJ...545..992B }} 17. ^1 {{citation | title=Starsong Chronicles: Exodus | last1=Clayborn | first1=JJ | date=March 2017 | isbn=978-1520611747}} }} External links
12 : K-type giants|Horizontal-branch stars|Planetary systems|Hyades (star cluster)|Taurus (constellation)|Stars with proper names|Bayer objects|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。