}}{{Starbox catalog
| names = Xuange, {{odlist | B=λ Boo | F=19 Boötis | BD=+46° 1949 | FK5=527 | GJ=3837 | HD=125162 | HIP=69732 | HR=5351 | SAO=44965 | GC=19273 }}
}}{{Starbox reference
|Simbad=lam+Boo
}}{{Starbox end}}Lambda Boötis (λ Boötis, abbreviated Lam Boo, λ Boo), also named Xuange,[1] is a star in the northern constellation of Boötes. Based on parallax measurements, it is approximately 99 light-years from the Sun.[1]Lambda Boötis is a white A-type main sequence dwarf with an apparent magnitude of +4.18. It is the prototype of a group of rare stars known as Lambda Boötis stars, all of which are dwarf stars with unusually low abundances of metals in their spectra. Its diameter has been directly measured to be 1.7 times that of the Sun.[2]
Nomenclature
λ Boötis (Latinised to Lambda Boötis) is the star's Bayer designation.
In Chinese astronomy, Lambda Boötis is called 玄戈, Pinyin: Xuángē, meaning 'sombre lance', because this star is marking itself and standing alone in the Sombre Lance asterism, Purple Forbidden enclosure (see : Chinese constellations).[3] 玄戈 (Xuángē) westernized into Heuen Ko, but that name was assigned to Gamma Boötis by R.H. Allen, with the meaning of 'the heavenly spear'.[4] In 2016, the IAU organized a Working Group on Star Names (WGSN)[5] to catalog and standardize proper names for stars. The WGSN approved the name Xuange for Lambda Boötis on 30 June 2017 and it is now so included in the List of IAU-approved Star Names.[1]
This star, along with the Aselli (Theta Boötis, Iota Boötis and Kappa Boötis), were Al Aulād al Dhiʼbah (ألعولد ألذعب - al aulād al dhiʼb), "the Whelps of the Hyenas".[6] Al Aulād al Dhiʼbah or Aulad al Thiba was the title of this star in a 1971 NASA memorandum.[7]
References
1. ^1 {{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |accessdate=16 December 2017}}
2. ^1 {{Citation| url=http://www.iop.org/EJ/article/0004-637X/659/2/1623/64307.html | author=Ciardi | title=The Angular Diameter of λ Boötis | journal=The Astrophysical Journal | volume=659 | issue=2 | pages=1623–1628 | year=2007 | doi=10.1086/512077 | last2=Van Belle | first2=Gerard T. | last3=Boden | first3=Andrew F. | last4=Ten Brummelaar | first4=T. | last5=McAlister | first5=H. A. | last6=Bagnuolo, Jr. | first6=W. G. | last7=Goldfinger | first7=P. J. | last8=Sturmann | first8=J. | last9=Sturmann | first9=L. | bibcode=2007ApJ...659.1623C|arxiv = astro-ph/0612723 | displayauthors=1 | last10=Turner | first10=N. | last11=Berger | first11=D. H. | last12=Thompson | first12=R. R. | last13=Ridgway | first13=S. T. | postscript= }}
3. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 14 日
4. ^Richard Hinckley Allen: Star Names — Their Lore and Meaning: Boötes
5. ^{{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}}
6. ^{{Citation| last=Allen | first=R. H. | year=1963 | authorlink=Richard Hinckley Allen | title=Star Names: Their Lore and Meaning | url=http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Bootes*.html | accessdate=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc | location=New York, NY | isbn=978-0-486-21079-7 | page=105| postscript= }}
7. ^[https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971]
8. ^1 {{citation | display-authors=1 | last1=Martínez-Galarza | first1=J. R. | last2=Kamp | first2=I. | last3=Su | first3=K. Y. L. | last4=Gáspár | first4=A. | last5=Rieke | first5=G. | last6=Mamajek | first6=E. E. | title=Infrared Emission by Dust Around λ Bootis Stars: Debris Disks or Thermally Emitting Nebulae? | journal=The Astrophysical Journal | volume=694 | issue=1 | pages=165–173 |date=March 2009 | doi=10.1088/0004-637X/694/1/165 | bibcode=2009ApJ...694..165M |arxiv = 0812.2198 }}
9. ^1 2 {{citation | last1=Song | first1=Inseok | last2=Caillault | first2=J.-P. | last3=Barrado y Navascués | first3=David | last4=Stauffer | first4=John R. | title=Ages of A-Type Vega-like Stars from uvbyβ Photometry | journal=The Astrophysical Journal | volume=546 | issue=1 | pages=352–357 |date=February 2001 | doi=10.1086/318269 | bibcode=2001ApJ...546..352S |arxiv = astro-ph/0010102 }}
10. ^1 2 3 4 5 6 {{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/articles/aa/abs/2007/41/aa8357-07/aa8357-07.html | last1=van Leeuwen | first1=F. | 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 }} Vizier catalog entry
11. ^1 {{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 | last1=Abt | first1=Helmut A. | last2=Morrell | first2=Nidia I. | year=1995 | doi=10.1086/192182 }}
12. ^1 2 3 {{Cite journal | last1=Johnson | display-authors=1 | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | pages=99 | year=1966 | bibcode=1966CoLPL...4...99J }}
13. ^1 {{Cite journal | last1=Gontcharov | first1=G. A. | title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system | journal=Astronomy Letters | volume=32| issue=11| pages=759–771| date=November 2006 | doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G | arxiv=1606.08053 }}
14. ^1 {{Cite journal | display-authors=1 | title=The status of Galactic field λ Bootis stars in the post-Hipparcos era | last1=Paunzen | first1=E. | last2=Iliev | first2=I. Kh. | last3=Kamp | first3=I. | last4=Barzova | first4=I. S. | journal=Monthly Notices of the Royal Astronomical Society | volume=336 | issue=3 | pages=1030–1042 | date=November 2002 | doi=10.1046/j.1365-8711.2002.05865.x | bibcode=2002MNRAS.336.1030P | arxiv=astro-ph/0207488 }}