{{Short description|Triple star system in the constellation Lupus}} {{Starbox begin}} {{Starbox image | image = {{Location mark |image=Lupus constellation map.svg|alt=|float=center|width=250 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=λ Lupi |x=560|y=840 }} | caption = Location of λ Lupi (circled in red) }} {{Starbox observe | epoch = [[J2000.0]] | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Lupus (constellation)|Lupus]] | ra = {{RA|15|08|50.61639}}<ref name=vanLeeuwen2007/> | dec = {{DEC|−45|16|47.4950}}<ref name=vanLeeuwen2007/> | appmag_v = 4.04<ref name=Mermilliod1986/> {{nowrap|(4.43 + 5.23)}}<ref name=Eggleton2008/> }} {{Starbox character | class = B3 V<ref name=houk1978/> {{nowrap|(B3 V + B3 V)}}<ref name=Edwards1976/> | b-v = −0.18<ref name=Mermilliod1986/> | u-b = −0.67<ref name=Mermilliod1986/> | r-i = | variable = }} {{Starbox astrometry | radial_v = {{Val|+9.80|1.78}}<ref name=deBruijne2012/> | prop_mo_ra = −15.88<ref name=vanLeeuwen2007/> | prop_mo_dec = −26.80<ref name=vanLeeuwen2007/> | parallax = 4.20 | p_error = 0.66 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = −2.75<ref name=Anderson2012/> }} {{Starbox orbit | reference = <ref name=Tokovinin2012/> | period = {{Val|70.8|0.8}} | axis = {{Val|0.2597|0.0021}} | eccentricity = {{Val|0.6283|0.0090}} | inclination = {{Val|71.59|0.41}} | node = {{Val|26.64|0.61}} | periastron = {{nowrap|1997.907 ± 0.105}} | periarg = {{Val|299.9|1.1}} }} {{Starbox detail | source = | component1 = λ Lup A | mass = 8.14<ref name=Tokovinin2012/> | radius = | luminosity = | temperature = | gravity = | metal_fe = | rotational_velocity = 135 | age_myr = {{Val|28.1|4.1}}<ref name=Tetzlaff2011/> | component2 = λ Lup B | mass2 = 5.84 }} {{Starbox catalog | names = [[Bayer designation|λ Lup]], [[Durchmusterung|CD]]−44°9889, [[Henry Draper Catalogue|HD]] 133955, [[Hipparcos Catalogue|HIP]] 74117, [[Harvard Revised catalogue|HR]] 5626, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 225483, [[Washington Double Star Catalog|WDS]] J15088-4517AB<ref name=SIMBAD/> }} {{Starbox reference | Simbad = lam+Lup }} {{Starbox end}} '''Lambda Lupi''', [[Latinisation of names|Latinized]] from '''λ Lupi''', is a [[triple star]]<ref name=Mitschelm2004/> system in the southern [[constellation]] of [[Lupus (constellation)|Lupus]]. It is visible to the naked eye with a combined [[apparent visual magnitude]] of 4.04.<ref name=Mermilliod1986/> Based upon an annual [[stellar parallax|parallax shift]] of just 4.20<ref name=vanLeeuwen2007/> [[milliarcsecond|mas]] as seen from Earth, it is located roughly 800 [[light year]]s from the [[Sun]]. The system has a [[peculiar velocity]] of {{Val|27.4|4.9|u=km/s}} relative to its neighbors, making it a candidate [[runaway star]] system.<ref name=Tetzlaff2011/> It is a member of the Upper Centaurus–Lupus sub-group in the [[Scorpius–Centaurus association|Scorpius–Centaurus OB association]].<ref name=Wolff2007/>
The two visible components of this system orbit each other over a [[orbital period|period]] of 70.8 years with a large [[orbital eccentricity|eccentricity]] of 0.63.<ref name=Tokovinin2012/> The primary component has a visual magnitude of 4.43, while the secondary is of magnitude 5.23.<ref name=Eggleton2008/> Both are [[B-type main sequence star]]s with a [[stellar classification]] of B3 V.<ref name=Edwards1976/> One of the pair is itself a double-lined [[spectroscopic binary]], making this a triple star system.<ref name=Mitschelm2004/>
==References== <references>
<ref name=vanLeeuwen2007>{{citation | title=Validation of the new Hipparcos reduction | 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 | s2cid=18759600 | postscript=. }}</ref>
<ref name=Anderson2012>{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 | postscript=. }}</ref>
<ref name=Mitschelm2004>{{citation | contribution=Discovery and confirmation of some double-lined spectroscopic binaries in the Sco-Cen Complex | last1=Nitschelm | first1=C. | title=In Spectroscopically and Spatially Resolving the Components of the Close Binary Stars, Proceedings of the Workshop held 20-24 October 2003 in Dubrovnik, Croatia | editor1-first=R. W. | editor1-last=Hilditch | editor2-first=H. | editor2-last=Hensberge | editor3-first=K. | editor3-last=Pavlovski | series=ASP Conference Series | volume=318 | publication-place=San Francisco | publisher=[[Astronomical Society of the Pacific]] | pages=291–293 | date=December 2004 | bibcode=2004ASPC..318..291N | postscript=. }}</ref>
<ref name=Wolff2007>{{citation | last1=Wolff | first1=S. C. | last2=Strom | first2=S. E. | last3=Dror | first3=D. | last4=Venn | first4=K. | title=Rotational Velocities for B0-B3 Stars in Seven Young Clusters: Further Study of the Relationship between Rotation Speed and Density in Star-Forming Regions | journal=[[The Astronomical Journal]] | display-authors=1 | volume=133 | pages=1092–1103 | date=2007 | issue=3 | doi=10.1086/511002 | bibcode=2007AJ....133.1092W | arxiv=astro-ph/0702133 | s2cid=119074863 | postscript=. }}</ref>
<ref name=Eggleton2008>{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>
<ref name=Tetzlaff2011>{{citation | display-authors=1 | last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M. | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=410 | issue=1 | pages=190–200 |date=January 2011 | doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | bibcode=2011MNRAS.410..190T | arxiv=1007.4883 | s2cid=118629873 | postscript=. }}</ref>
<ref name=Edwards1976>{{citation | last1=Edwards | first1=T. W. | title=MK classification for visual binary components | journal=Astronomical Journal | postscript=. | volume=81 | pages=245–249 |date=April 1976 | doi=10.1086/111879 | bibcode=1976AJ.....81..245E }} The system is listed in Table II as −44°9889.</ref>
<ref name=deBruijne2012>{{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | s2cid=59451347 | postscript=. }}</ref>
<ref name=houk1978>{{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=2 | publication-place=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan | year=1978 | bibcode=1978mcts.book.....H | postscript=. }}</ref>
<ref name=Tokovinin2012>{{citation | title=Speckle Interferometry and Orbits of "Fast" Visual Binaries | last1=Tokovinin | first1=Andrei | journal=The Astronomical Journal | postscript=. | volume=144 | issue=2 | at=56 | year=2012 | arxiv=1206.1882 | bibcode=2012AJ....144...56T | doi=10.1088/0004-6256/144/2/56 | s2cid=118586009 }}</ref>
<ref name=Mermilliod1986>{{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | journal=Catalogue of Eggen's UBV Data | year=1986 | publisher=[[SIMBAD]] | bibcode=1986EgUBV........0M | postscript=. }}</ref>
<ref name=SIMBAD>{{cite simbad | title=* lam Lup | access-date=2017-03-07 | postscript=. }}</ref>
</references>
==External links== *{{citation | first1=James B. | last1=Kaler | date=June 20, 2014 | title=Lambda Lupi | work=Stars | publisher=University of Illinois | url=http://stars.astro.illinois.edu/sow/lambdalup.html | accessdate=2017-03-08 | postscript=. }}
{{Stars of Lupus|state=collapsed}} <!-- Properties --> [[Category:B-type main-sequence stars]] [[Category:Runaway stars]] [[Category:Triple star systems]] <!-- Identifiers --> [[Category:Lupus (constellation)]] [[Category:Bayer objects|Lupi, Lambda]] [[Category:Durchmusterung objects|CD-44 09889]] [[Category:Henry Draper Catalogue objects|133955]] [[Category:Hipparcos objects|074117]] [[Category:Bright Star Catalogue objects|5626]] [[Category:Upper Centaurus Lupus]]