Lambda Lupi
{{Short description|Triple star system in the constellation Lupus}}
{{Starbox begin
| name = Lambda Lupi
}}
{{Starbox observe
| epoch = J2000.0
| constell = Lupus
| dec = {{DEC|−45|16|47.4950}}
| appmag_v = 4.04 {{nowrap|(4.43 + 5.23)}}
}}
{{Starbox character
| class = B3 V {{nowrap|(B3 V + B3 V)}}
| r-i =
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|+9.80|1.78}}
| parallax = 4.20
| p_error = 0.66
}}
{{Starbox orbit
| 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
| radius =
| luminosity =
| temperature =
| gravity =
| metal_fe =
| rotational_velocity = 135
| component2 = λ Lup B
| mass2 = 5.84
}}
{{Starbox catalog
| names = λ Lup, CD−44°9889, HD 133955, HIP 74117, HR 5626, SAO 225483, WDS J15088-4517AB
}}
{{Starbox reference
| Simbad = lam+Lup
}}
{{Starbox end}}
Lambda Lupi, Latinized from λ Lupi, is a triple star system in the southern constellation of Lupus. It is visible to the naked eye with a combined apparent visual magnitude of 4.04. Based upon an annual parallax shift of just 4.20 mas as seen from Earth, it is located roughly 800 light years 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. It is a member of the Upper Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association.
The two visible components of this system orbit each other over a period of 70.8 years with a large eccentricity of 0.63. The primary component has a visual magnitude of 4.43, while the secondary is of magnitude 5.23. Both are B-type main sequence stars with a stellar classification of B3 V. One of the pair is itself a double-lined spectroscopic binary, making this a triple star system.
References
{{reflist|refs=
| 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=. }}
| 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=. }}
| 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=. }}
| 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=. }}
| 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=. }}
| 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=. }}
| 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.
| 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=. }}
| 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=. }}
| 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 }}
| 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=. }}
| title=* lam Lup
| access-date=2017-03-07 | postscript=. }}
}}
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}}
Category:B-type main-sequence stars
Category:Lupus (constellation)