Lambda Boötis: Difference between revisions

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imported>PopePompus
Added a light curve
 
imported>Davemck
 
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{{Starbox detail
{{Starbox detail
  | mass        = {{val|1.66|0.19|0.16}}<ref name=aaa495_3_901/>
  | mass        = {{val|1.66|0.19|0.16}}<ref name=aaa495_3_901/>
  | radius      = 1.7<ref name=apj659_2_1623/>
  | radius      = {{val|1.70|0.10}}<ref name=apj659_2_1623/>
  | gravity    = 4.188<ref name=apj546_1_352/>
  | gravity    = 4.188<ref name=apj546_1_352/>
  | luminosity  = {{val|19.1|9.0|6.1}}<ref name=aaa495_3_901/>
  | luminosity  = {{val|16.3|0.6}}<ref name=apj659_2_1623/>
  | temperature = {{val|8,720}}<ref name=apj694_1_165/>
  | temperature = {{val|8887|242|fmt=commas}}<ref name=apj659_2_1623/>
  | metal_fe    =  
  | metal_fe    =  
  | rotational_velocity = 100<ref name=apj546_1_352/>
  | rotational_velocity = 100<ref name=apj546_1_352/>
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<ref name=aaa495_3_901>{{Cite journal | display-authors=1 | last1=Montesinos | first1=B. | last2=Eiroa | first2=C. | last3=Mora | first3=A. | last4=Merín | first4=B. | title=Parameters of Herbig Ae/Be and Vega-type stars | journal=Astronomy and Astrophysics | volume=495 | issue=3 | pages=901–917 |date=March 2009 | doi=10.1051/0004-6361:200810623 | bibcode=2009A&A...495..901M |arxiv = 0811.3557 | s2cid=14972955 }}</ref>
<ref name=aaa495_3_901>{{Cite journal | display-authors=1 | last1=Montesinos | first1=B. | last2=Eiroa | first2=C. | last3=Mora | first3=A. | last4=Merín | first4=B. | title=Parameters of Herbig Ae/Be and Vega-type stars | journal=Astronomy and Astrophysics | volume=495 | issue=3 | pages=901–917 |date=March 2009 | doi=10.1051/0004-6361:200810623 | bibcode=2009A&A...495..901M |arxiv = 0811.3557 | s2cid=14972955 }}</ref>
<ref name=apj694_1_165>{{Cite journal | 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 | s2cid=14298654 }}</ref>


<ref name=apj546_1_352>{{Cite journal | 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 | s2cid=18154947 }}</ref>
<ref name=apj546_1_352>{{Cite journal | 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 | s2cid=18154947 }}</ref>
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==External links==
==External links==
* {{Cite journal
* {{Cite book
  | author1=Hoffleit |display-authors=etal | year=1991 | title=HR 5351
  | author1=Hoffleit |display-authors=etal | year=1991 | chapter=HR 5351
  | work=Bright Star Catalogue | edition=5th Revised
  | title=Bright Star Catalogue | edition=5th Revised
  | url=http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205351
  | chapter-url=http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205351
  | access-date=2017-09-13 }}
  | access-date=2017-09-13 }}
* {{Cite journal
* {{Cite web
  | url=http://aladin.u-strasbg.fr/AladinPreview?-c=14+16+23.0187%2B46+05+17.900&ident=NLTT+36818&submit=Aladin+previewer
  | url=https://aladin.cds.unistra.fr/AladinLite/?target=14%2016%2023.018%2B46%2005%2017.90&fov=0.40&survey=P%2FDSS2%2Fcolor
  | title=lam Bo0 | work=Aladin previewer
  | title=lam Bo0 | website=[[Aladin Sky Atlas]]
  | publisher=Centre de Données astronomiques de Strasbourg
  | publisher=Centre de Données astronomiques de Strasbourg
  | access-date=2017-09-12 }}
  | access-date=2025-06-25 }}


{{Stars of Boötes}}
{{Stars of Boötes}}

Latest revision as of 21:55, 25 June 2025

Template:Short description

λ Boötis
Template:Location mark
Location of λ Boötis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Boötes
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +4.18[2]
Characteristics
Spectral type A0p λB[3]
U−B Template:Engvar +0.05[2]
B−V Template:Engvar +0.08[2]
Variable type δ Sct[4]
Astrometry
Radial velocity (Rv)Template:Val[5] km/s
Proper motion (μ) RA: −187.698 mas/yr[1]
Dec.: 159.309 mas/yr[1]
Parallax (π)32.5885±0.1410 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Template:Val[6]
Details
MassTemplate:Val[7] Template:Solar mass
RadiusTemplate:Val[8] Template:Solar radius
LuminosityTemplate:Val[8] Template:Solar luminosity
Surface gravity (log g)4.188[9] cgs
TemperatureTemplate:Val[8] K
Rotational velocity (v sin i)100[9] km/s
AgeTemplate:Val[7] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata

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Lambda Boötis is a star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from λ Boötis, and abbreviated Lam Boo or λ Boo. It has the official name Xuange,[11] pronounced Template:IPAc-en.Script error: No such module "Unsubst". With an apparent visual magnitude of +4.18, it is faintly visible to the naked eye. Based on parallax measurements, it is Template:Convert distant from Earth.[1] This star is drifting closer to the Sun with a radial velocity of −8 km/s.[5]

File:LamBooLightCurve.png
A light curve for Lambda Boötis, plotted from TESS data[12]

This is a white hued A-type main-sequence star with a stellar classification of A0p λB.[3] 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.[8] This is a Delta Scuti variable star with a period of Template:Convert and an amplitude of 0.0020 in visual magnitude.[4]

This star displays an infrared excess that may be the result of a circumstellar disk of orbiting debris, or else a bow wave from its motion through the interstellar medium.[13]

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).[14] 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'.[15] In 2016, the IAU organized a Working Group on Star Names (WGSN)[16] 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.[11]

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".[17] Al Aulād al Dhiʼbah or Aulad al Thiba was the title of this star in a 1971 NASA memorandum.[18]

References

Template:Reflist

External links

  • Script error: No such module "citation/CS1".
  • Script error: No such module "citation/CS1".

Template:Stars of Boötes

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named GaiaDR3
  2. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named 1966CoLPL_4_99J
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named abt1995
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Chang_et_al_2013
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Gontcharov2006
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Paunzen2002
  7. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa495_3_901
  8. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named apj659_2_1623
  9. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named apj546_1_352
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  11. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named IAU-LSN
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MAST
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Draper_et_al_2016
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named AEEA
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Allen
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WGSN
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Allen_1963
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Rhoads_1971
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