{{short description|Star in the constellation Lupus}} {{Starbox begin | name = Upsilon Lupi }} {{Starbox image | image = <div style="position: relative">[[File:Lupus IAU.svg|250px]] <div style="position: absolute; left: 44.0%; top: 37.5%">[[File:Map pointer.svg|17px]]</div> </div> | caption = The location of Upsilon Lupi (υ) in the [[constellation]] of [[Lupus (constellation)|Lupus]] (shown as a red target's bullseye). }} {{Starbox observe | epoch = [[J2000.0]] | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Lupus (constellation)|Lupus]] | ra = {{RA|15|24|45.00855}}<ref name=vanLeeuwen2007/> | dec = {{DEC|−39|42|36.9524}}<ref name=vanLeeuwen2007/> | appmag_v = 5.37<ref name=Corben1968/> {{nowrap|(5.37 + 10.90)}}<ref name=Mason2014/> }} {{Starbox character | class = A0p Si<ref name=houk1979/> | b-v = −0.11<ref name=Corben1968/> | u-b = | r-i = | variable = }} {{Starbox astrometry | radial_v = {{Val|−7.6|2.8}}<ref name=deBruijne2012/> | prop_mo_ra = −26.10<ref name=vanLeeuwen2007/> | prop_mo_dec = −54.77<ref name=vanLeeuwen2007/> | parallax = 8.02 | p_error = 0.62 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = −0.10<ref name=Anderson2012/> }} {{Starbox detail | source = | component1 = υ Lup A | mass = | radius = | luminosity = 113<ref name=Mcdonald2012/> | temperature = 10,049<ref name=Mcdonald2012/> | gravity = | metal_fe = | rotational_velocity = 0<ref name=uesugi_fukuda70/> | age_myr = }} {{Starbox catalog | names = [[Bayer designation|υ Lup]], [[Durchmusterung|CD]]−39°9827, [[Henry Draper Catalogue|HD]] 136933, [[Hipparcos Catalogue|HIP]] 75439, [[Harvard Revised catalogue|HR]] 5719, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 206597<ref name=SIMBAD/> }} {{Starbox reference | Simbad = ups+Lup }} {{Starbox end}} '''Upsilon Lupi''', [[Latinisation of names|Latinized]] from υ Lupi, is a [[star]] system in the southern [[constellation]] of [[Lupus (constellation)|Lupus]]. It is faintly visible to the naked eye with an [[apparent visual magnitude]] of 5.37.<ref name=Corben1968/> Based upon an annual [[stellar parallax|parallax shift]] of 8.02<ref name=vanLeeuwen2007/> [[milliarcsecond|mas]] as seen from Earth, it is located around 410 [[light year]]s from the [[Sun]]. The two components of Upsilon Lupi share a [[common proper motion]] through space and most likely form a wide [[binary star]] system.<ref name=Eggleton2008/> As of 1945, the pair had an [[angular separation]] of 1.50 [[arc second]]s along a [[position angle]] of 40°.<ref name=Mason2014/>
The brighter member, component A, is a [[Chemically peculiar star|chemically peculiar]] [[Ap star]] with a [[stellar classification]] of A0p Si,<ref name=houk1979/> where the 'Si' suffix indicates an abnormal abundance of silicon in the star's [[photosphere]]. A [[stellar magnetic field|magnetic field]] has been detected with a [[quadratic field strength]] of {{Val|764.7|311.3|e=-4|ul=T}}.<ref name=Bychkova2009/> The star is radiating 113 times the [[solar luminosity]] from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 10,049 K.<ref name=Mcdonald2012/>
The magnitude 10.9 companion star, component B, has a visual magnitude of 10.90.<ref name=Mason2014/> It may be the source of the [[X-ray astronomy|X-ray emission]] detected coming from these coordinates.<ref name=Schroeder2007/>
==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=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=Schroeder2007>{{citation | title=X-ray emission from A-type stars | last1=Schröder | first1=C. | last2=Schmitt | first2=J. H. M. M. | journal=Astronomy and Astrophysics | postscript=. | volume=475 | issue=2 | pages=677–684 | date=November 2007 | doi=10.1051/0004-6361:20077429 | bibcode=2007A&A...475..677S | doi-access=free }}</ref>
<ref name=Bychkova2009>{{citation | title=Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars | display-authors=1 | last1=Bychkov | first1=V. D. | last2=Bychkova | first2=L. V. | last3=Madej | first3=J. | journal=Monthly Notices of the Royal Astronomical Society | volume=394 | issue=3 | pages=1338–1350 | date=April 2009 | doi=10.1111/j.1365-2966.2008.14227.x | bibcode=2009MNRAS.394.1338B | s2cid=120268049 | postscript=. | doi-access=free }}</ref>
<ref name=Mcdonald2012>{{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | s2cid=118665352 | postscript=. }}</ref>
<ref name=Mason2014>{{citation | display-authors=1 | last1=Mason | first1=B. D. | last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I. | last4=Douglass | first4=G. G. | last5=Worley | first5=C. E. | title=The Washington Visual Double Star Catalog | journal=The Astronomical Journal | postscript=. | year=2014 | pages=3466–3471 | volume=122 | issue=6 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | doi-access=free }}</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=houk1979>{{citation | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=3 | last1=Houk | first1=Nancy | postscript=. | publication-place=Ann Arbor, Michigan | publisher=Dept. of Astronomy, University of Michigan | date=1979 | bibcode=1982mcts.book.....H }}</ref>
<ref name=uesugi_fukuda70>{{citation | last1=Uesugi | first1=Akira | last2=Fukuda | first2=Ichiro | title=Catalogue of rotational velocities of the stars | journal=Contributions from the Institute of Astrophysics and Kwasan Observatory | date=1970 | publisher=University of Kyoto | bibcode=1970crvs.book.....U | postscript=. }}</ref>
<ref name=Corben1968>{{citation | last1=Corben | first1=P. M. | last2=Stoy | first2=R. H. | title=Photoelectric Magnitudes and Colours for Bright Southern Stars | journal=Monthly Notes of the Astronomical Society of Southern Africa | volume=27 | page=11 | year=1968 | bibcode=1968MNSSA..27...11C | postscript=. }}</ref>
<ref name=SIMBAD>{{cite simbad | title=ups Lup | access-date=2017-03-10 }}</ref>
</references>
{{Stars of Lupus|state=collapsed}}
[[Category:Lupus (constellation)]] [[Category:Bayer objects|Lupi, Upsilon]] [[Category:Henry Draper Catalogue objects|136933]] [[Category:Bright Star Catalogue objects|5719]] [[Category:Hipparcos objects|075439]] [[Category:Durchmusterung objects]] [[Category:Ap stars]] [[Category:Binary stars]]