| 词条 | Theta Serpentis |
| 释义 |
| name=θ Serpentis }}{{Starbox observe | epoch=J2000.0 | constell=Serpens | ra={{RA|18|56|13.18}}[1] | dec={{DEC|+04|12|12.9}}[1] | appmag_v=+4.03 {{nowrap|(4.62[3] + 4.98[3] + 6.71[5])}} }}{{Starbox character | class=A5V[6] + A5Vn[6] + G1V[8] }}{{Starbox astrometry | component1 = θ¹ Ser | parallax = 21.09 | p_error = 2.86 | parallax_footnote = [9] | dist_ly= | dist_pc= }}{{Starbox astrometry|no_heading=y | component1 = θ² Ser | parallax = 19.25 | p_error = 3.57 | parallax_footnote = [9] | dist_ly= | dist_pc= }}{{Starbox astrometry|no_heading=y | component1 = θ Ser C | parallax = 37.73 | p_error = 0.51 | parallax_footnote = [9] | dist_ly= | dist_pc= | absmag_v = +4.60[12] }}{{Starbox detail | component1 = θ Ser C | source = [12] | mass = 1.097 | radius = 0.9870 | luminosity = 1.1817 | temperature = 6,067 | metal_fe = −0.09 | age_myr = 200 }}{{Starbox catalogue | names=63 Serpentis, ADS 11853, CCDM 18563+0413, WDS 18562+0412 | component2 = θ¹ Ser | names2 = Alya, θ Ser A, HR 7141, HD 175638, SAO 124068, HIP 92946, WDS 18562+0412A | component3 = θ² Ser | names3 = θ Ser B, HR 7142, HD 175639, SAO 124070, HIP 92951, WDS 18562+0412B | component4 = θ Ser C | names4 = HD 175726, HIP 92984, WDS 18562+0412C }}{{Starbox reference | Simbad = theta+ser|sn=θ Ser | Simbad2 = HD+175638|sn2=θ¹ Ser | Simbad3 = HD+175639|sn3=θ² Ser | Simbad4 = HD+175726|sn4=θ Ser C }}{{Starbox end}} Theta Serpentis (θ Serpentis, abbreviated Theta Ser, θ Ser) is a triple star system in the constellation of Serpens. It consists of a binary pair designated Theta Serpentis AB and whose two components are designated Theta¹ Serpentis or Theta Serpentis A (and also named Alya) and Theta² Serpentis or Theta Serpentis B, together with a third visual companion Theta Serpentis C.[1] Based upon parallax measurements obtained during the Hipparcos mission, θ Serpentis AB is approximately 160 light-years, and θ Serpentis C approximately 86 light-years, from the Sun. Nomenclatureθ Serpentis (Latinised to Theta Serpentis) is the system's Bayer designation; θ¹ and θ² Serpentis those of the brightest two components. The designations of the two constituents as Theta Serpentis AB and C, and those of AB's components - Theta Serpentis A and B - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[16]The system bore the traditional name Alya, or Alga, from the Arabic الية ’alyah "fat tail (of a sheep)".{{citation needed|date=March 2018}} In 2016, the IAU organized a Working Group on Star Names (WGSN)[17] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[2] It approved the name Alya for the component Theta Serpentis A on 21 August 2016 and it is now so included in the List of IAU-approved Star Names. In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Dzaneb al Haiyet, which was translated into Latin as Cauda Serpentis, meaning 'the serpent's tail'.[20] In Chinese, {{lang|zh|天市左垣}} ({{lang|zh-Latn|Tiān Shì Zuǒ Yuán}}), meaning Left Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven old states in China, consisting of Theta Serpentis, Delta Herculis, Lambda Herculis, Mu Herculis, Omicron Herculis, 112 Herculis, Zeta Aquilae, Eta Serpentis, Nu Ophiuchi, Xi Serpentis and Eta Ophiuchi.[21] Consequently, Theta Serpentis itself is known as {{lang|zh|天市左垣七}} ({{lang|zh-Latn|Tiān Shì Zuǒ Yuán qī}}, {{lang-en|the Seventh Star of Left Wall of Heavenly Market Enclosure}}), representing the state Xu (徐).[22][23] PropertiesBoth Theta¹ Serpentis and Theta² Serpentis are white A-type main sequence dwarfs. θ¹ has an apparent magnitude of +4.62 while the slightly dimmer θ² has a magnitude of +4.98. These two stars are 22 arcseconds apart on the sky, putting them at least 900 AU apart with an orbital period of at least 14,000 years. Both stars are similar to each other in all respects, having luminosities of 18 and 13 times solar respectively, radii of about twice solar and also masses of roughly 2 times that of the Sun. Both stars have a surface temperature of 8,000 kelvins. Theta Serpentis C is a yellow G-type star with an apparent magnitude of +6.71. It is separated by 7 arcminutes from θ². References1. ^{{cite web | url=http://ad.usno.navy.mil/wds/ | title=Washington Double Star Catalog | publisher=United States Naval Observatory | accessdate=6 March 2018 | deadurl=yes | archiveurl=https://web.archive.org/web/20110214155533/http://ad.usno.navy.mil/wds/ | archivedate=14 February 2011 | df= }} [3][4][5][6][7][8][9][10][11][12][13][14][15]2. ^{{cite web | url=https://www.iau.org/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf | page=5 | title=WG Triennial Report (2015-2018) - Star Names |accessdate=2018-07-14}} 3. ^1 {{cite journal|title=On the naming convention used for multiple star systems and extrasolar planets |volume=1012 |pages=arXiv:1012.0707 |date=2010 |arxiv=1012.0707 |last1= Hessman |first1=F. V. |last2= Dhillon |first2=V. S. |last3= Winget |first3=D. E. |last4= Schreiber |first4=M. R. |last5= Horne |first5=K. |last6= Marsh |first6=T. R. |last7= Guenther |first7=E. |last8= Schwope |first8=A. |last9= Heber |first9=U. |bibcode=2010arXiv1012.0707H}} 4. ^1 {{cite journal | last=Knobel | first=E. B. | title=Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket | journal=Monthly Notices of the Royal Astronomical Society | volume=55 | issue=8 | page=429 |date=June 1895 | bibcode=1895MNRAS..55..429K | doi=10.1093/mnras/55.8.429}} 5. ^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=. }} 6. ^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}}. 7. ^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/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. 8. ^1 {{zh icon}} English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name {{webarchive|url=https://web.archive.org/web/20100810114313/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/e_research_chinengstarzone_b.htm |date=2010-08-10 }}, Hong Kong Space Museum. Accessed on line November 23, 2010. 9. ^1 2 3 {{cite journal | last1=van Leeuwen | first1=F. | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357}} 10. ^1 2 {{cite journal|bibcode=2001AJ....122.3466M|title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog|journal=The Astronomical Journal|volume=122|issue=6|pages=3466|author1=Mason|first1=Brian D.|last2=Wycoff|first2=Gary L.|last3=Hartkopf|first3=William I.|last4=Douglass|first4=Geoffrey G.|last5=Worley|first5=Charles E.|year=2001|doi=10.1086/323920}} 11. ^1 2 {{cite journal |bibcode=1991bsc..book.....H |title=The Bright star catalogue |journal=New Haven |author1=Hoffleit |first1=Dorrit |last2=Jaschek |first2=Carlos |year=1991}} 12. ^1 {{citation | title=The Tycho-2 catalogue of the 2.5 million brightest stars | journal=Astronomy and Astrophysics | display-authors=1 | last1=Høg | first1=E. | last2=Fabricius | first2=C. | last3=Makarov | first3=V. V. | last4=Urban | first4=S. | last5=Corbin | first5=T. | last6=Wycoff | first6=G. | last7=Bastian | first7=U. | last8=Schwekendiek | first8=P. | last9=Wicenec | first9=A. | year=2000 | volume=355 | pages=L27 | bibcode=2000A&A...355L..27H | doi=10.1888/0333750888/2862| isbn=0333750888 }} 13. ^1 2 {{cite journal | bibcode=1995ApJS...99..135A | title=The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars | journal=Astrophysical Journal Supplement | volume=99 | pages=135 | author1=Abt | first1=Helmut A. | last2=Morrell | first2=Nidia I. | year=1995 | doi=10.1086/192182 }} 14. ^1 {{cite journal|bibcode=1999MSS...C05....0H|title=Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5|journal=Michigan Spectral Survey|volume=05|pages=0|author1=Houk|first1=N.|last2=Swift|first2=C.|year=1999}} 15. ^1 2 {{cite journal | display-authors=1 | last1=Boyajian | first1=Tabetha S. | last2=von Braun | first2=Kaspar | last3=van Belle | first3=Gerard | last4=Farrington | first4=Chris | last5=Schaefer | first5=Gail | last6=Jones | first6=Jeremy | last7=White | first7=Russel | last8=McAlister | first8=Harold A. | last9=ten Brummelaar | first9=Theo A. | last10=Ridgway | first10=Stephen | last11=Gies | first11=Douglas | last12=Sturmann | first12=Laszlo | last13=Sturmann | first13=Judit | last14=Turner | first14=Nils H. | last15=Goldfinger | first15=P. J. | last16=Vargas | first16=Norm | title=Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations | journal=The Astrophysical Journal | volume=771 | issue=1 | id=40 | pages=31 | date=July 2013 | arxiv=1306.2974 | doi=10.1088/0004-637X/771/1/40 | bibcode=2013ApJ...771...40B | postscript=.}} See Table 3. }} External links
11 : Bayer objects|Serpens (constellation)|Triple star systems|A-type main-sequence stars|G-type main-sequence stars|Stars with proper names|Flamsteed objects|Hipparcos objects|HR objects|Henry Draper Catalogue objects|Durchmusterung objects |
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