| 词条 | Eta Eridani |
| 释义 |
| name = η Eridani }}{{Starbox image | image={{Location mark |image=Eridanus constellation map.svg|alt=|float=center|width=240 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=η Eri |x=738|y=231 }} |caption=Location of η Eridani (circled) }}{{Starbox observe | epoch = J2000.0 | constell = Eridanus | ra = {{RA|02|56|25.64948}}[1] | dec = {{DEC|−08|53|53.3221}}[1] | appmag_v = +3.87[3] }}{{Starbox character | class = K1+ IIIb[4] | b-v = +1.12[3] | u-b = _0.98[3] | variable=suspected[7] }}{{Starbox astrometry | radial_v = −20.32 | prop_mo_ra = +77.36 ± 0.19[1] | prop_mo_dec = −220.16 ± 0.20[1] | parallax = 23.89 | p_error = 0.19 | parallax_footnote = [1] | dist_pc = | absmag_v = +0.83[11] }}{{Starbox detail | mass = 1.43[12] | radius = 10.48[12] | luminosity = 57.5[12] | temperature = 4,742[12] | metallicity_fe = −0.04[12] | gravity = +2.79[12] | rotational_velocity = 2.34[12] | age_gyr = 2.66[12] }}{{Starbox catalog | names = Azha,[20] η Eri, 3 Eridani, NSV 988, HR 874, HD 18322, BD−09°533, HIP 13701 }}{{Starbox reference | Simbad = Eta+Eridani }}{{Starbox end}} Eta Eridani (η Eridani, abbreviated Eta Eri, η Eri), also named Azha,[20] is a giant star in the constellation of Eridanus. Based on parallax measurements taken during the Hipparcos mission, it is approximately 137 light-years from the Sun. Nomenclatureη Eridani (Latinised to Eta Eridani) is the star's Bayer designation. It bore the traditional name Azha ("the breeding place"), a corruption of the Persian آشيانه āšiyāne "the (ostrich) nest"".[22] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[23] to catalogue and standardize proper names for stars. The WGSN approved the name Azha for this star on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[20] In Chinese, {{lang|zh|天苑}} ({{lang|zh-Latn|Tiān Yuàn}}), meaning Celestial Meadows, refers to an asterism consisting of Eta Eridani, Gamma Eridani, Pi Eridani, Delta Eridani, Epsilon Eridani, Zeta Eridani, Pi Ceti, Tau1 Eridani, Tau2 Eridani, Tau3 Eridani, Tau4 Eridani, Tau5 Eridani, Tau6 Eridani, Tau7 Eridani, Tau8 Eridani and Tau9 Eridani.[25] Consequently, Eta Eridani itself is known as {{lang|zh|天苑六}} ({{lang|zh-Latn|Tiān Yuàn liù}}, {{lang-en|the Sixth Star of Celestial Meadows}}).[26] Propertiesη Eridani belongs to spectral class K3 and has a giant luminosity class. It is an evolved star that has expanded to tens times the size of the sun and nearly sixty times its luminosity. It is red clump giant, a star slightly more massive than the sun which is currently fusing helium in its core.[27] This is a mild barium star, sometimes referred to a "semi-barium" star. Although most barium stars are in binary systems, η Eridani has no known companion.[28] η Eridani is a high proper motion star, a relatively close star that is moving across the sky at a high rate compared to most stars. It is suspected to be a variable star with a range from magnitude 3.81 to 3.90.[7] References1. ^1 Star Name - R.H. Allen p.218 [1][2][3][4][5][6][7][8][9][10][11][12][13]2. ^1 {{cite journal|bibcode= 2012MNRAS.419.1637L |title= A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars |journal= Monthly Notices of the Royal Astronomical Society |volume= 419 |issue= 2 |pages= 1637 |author1= Laney |first1= C. D. |last2= Joner |first2= M. D. |last3= Pietrzyński |first3= G. |year= 2012 |doi= 10.1111/j.1365-2966.2011.19826.x |arxiv = 1109.4800 }} 3. ^1 {{cite journal|bibcode=1991AJ....101.2229L|title=Taxonomy of barium stars|journal=Astronomical Journal|volume=101|pages=2229|author1=Lu|first1=Phillip K.|year=1991|doi=10.1086/115845}} 4. ^1 {{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}}. 5. ^1 {{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/20100811014924/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ama_b.htm |date=August 11, 2010 }}, Hong Kong Space Museum. Accessed on line November 23, 2010. 6. ^1 {{cite journal|bibcode=1989ApJS...71..245K|title=The Perkins catalog of revised MK types for the cooler stars|journal=Astrophysical Journal Supplement Series|volume=71|pages=245|author1=Keenan|first1=Philip C.|last2=McNeil|first2=Raymond C.|year=1989|doi=10.1086/191373}} 7. ^1 2 3 4 5 {{cite journal|bibcode= 2007A&A...474..653V |title= Validation of the new Hipparcos reduction |journal= Astronomy and Astrophysics |volume= 474 |issue= 2 |pages= 653 |author1= Van Leeuwen |first1= F. |year= 2007 |doi= 10.1051/0004-6361:20078357 |arxiv = 0708.1752 }} 8. ^1 2 3 {{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|pages=0|author1=Ducati|first1=J. R.|year=2002}} 9. ^1 2 {{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S|volume=1|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}} 10. ^1 2 3 4 5 6 7 8 {{cite journal|bibcode= 2015A&A...574A..50J|title= Stellar parameters and chemical abundances of 223 evolved stars with and without planets|journal= Astronomy & Astrophysics|volume= 574|pages= A50|author1= Jofré|first1= E.|last2= Petrucci|first2= R.|last3= Saffe|first3= C.|last4= Saker|first4= L.|last5= de la Villarmois|first5= E. Artur|last6= Chavero|first6= C.|last7= Gómez|first7= M.|last8= Mauas|first8= P. J. D.|year= 2015|doi= 10.1051/0004-6361/201424474|arxiv = 1410.6422 }} 11. ^1 {{cite journal|bibcode=2006A&A...458..609D|arxiv=astro-ph/0608160|title=Basic physical parameters of a selected sample of evolved stars|journal=Astronomy and Astrophysics|volume=458|issue=2|pages=609|author1=Da Silva|first1=L.|last2=Girardi|first2=L.|last3=Pasquini|first3=L.|last4=Setiawan|first4=J.|last5=von Der Lühe|first5=O.|last6=De Medeiros|first6=J. R.|last7=Hatzes|first7=A.|last8=Döllinger|first8=M. P.|last9=Weiss|first9=A.|year=2006|doi=10.1051/0004-6361:20065105}} 12. ^1 2 3 {{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |accessdate=16 December 2017}} 13. ^1 {{citation | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN) | publisher=International Astronomical Union | accessdate=22 May 2016 | postscript=. }} }}{{Stars of Eridanus}} 13 : K-type giants|Horizontal-branch stars|Barium stars|Suspected variables|High-proper-motion stars|Eridanus (constellation)|Bayer objects|Stars with proper names|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |
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