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| {{Starbox begin
| | The writer's name is Andera and she thinks it sounds fairly good. To climb is something she would never give up. Alaska is exactly where he's always been living. Invoicing is my occupation.<br><br>my blog [http://formalarmour.com/index.php?do=/profile-26947/info/ best psychic readings] |
| | name=Sigma Puppis
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| }}
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| {{Starbox image
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| | image =
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| <div style="position: relative">[[File:Puppis IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Puppis constellation and its surroundings]]
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| <div style="position: absolute; left: 48.2%; top: 60.5%">[[File:Cercle rouge 100%.svg|12px]]</div>
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| </div>
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| | caption=Location of σ Puppis (circled)
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| }}
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| {{Starbox observe
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| | epoch = J2000
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| | ra = {{RA|07|29|13.83049}}<ref name=aaa474_2_653/>
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| | dec = {{DEC|–43|18|05.1597}}<ref name=aaa474_2_653/>
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| | appmag_v = 3.25<ref name=clpl4_99/>
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| | constell = [[Puppis]]
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| }}
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| {{Starbox character
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| | class = K5 III<ref name=houk1978/>
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| | b-v = +1.52<ref name=clpl4_99/>
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| | u-b = +1.77<ref name=clpl4_99/>
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| | variable =
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| }}
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| {{Starbox astrometry
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| | radial_v = +87.7<ref name=rgcrv/>
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| | prop_mo_ra = –59.55<ref name=aaa474_2_653/>
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| | prop_mo_dec = +188.31<ref name=aaa474_2_653/>
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| | parallax = 16.84
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| | p_error = 0.15
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| | parallax_footnote = <ref name=aaa474_2_653/>
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| | absmag_v =
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| }}
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| {{Starbox orbit
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| | reference = <ref name=pdaov15_121/>
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| | period_unitless = 257.8 days
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| | eccentricity = 0.17
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| | periastron = 20418.6
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| | periarg = 349.3
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| | k1 = 18.6
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| }}
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| {{Starbox detail
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| | component1 = σ Pup A
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| | mass =
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| | radius = 107<ref name=lang2006/>
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| | luminosity =
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| | temperature =
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| | gravity =
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| | metal_fe =
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| | rotational_velocity = 3.0<ref name=aaa382_1016/>
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| | age =
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| }}
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| {{Starbox catalog
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| | names = σ Puppis, σ Pup, Sigma Pup, [[Durchmusterung|CPD]]−43 1499, [[Fifth Fundamental Catalogue|FK5]] 1194, [[Boss General Catalogue|GC]] 10040, [[Henry Draper catalogue|HD]] 59717, [[Hipparcos catalogue|HIP]] 36377, [[Bright Star Catalogue|HR]] 2878, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 218755, [[Washington Double Star Catalog|WDS]] J07292-4318A <ref name=SIMBAD/>
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| }}
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| {{Starbox end}}
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| '''Sigma Puppis''' ('''Sigma Pup''', '''σ Puppis''', '''σ Pup''') is a [[binary star]] system in the southern [[constellation]] of [[Puppis]]. It has an [[apparent visual magnitude]] of 3.25,<ref name=clpl4_99/> which is bright enough to be visible to the naked eye at night from the [[southern hemisphere]]. Through a telescope, it appears as an bright, orange-hued star with a nearby white companion.<ref name=plotner_mann2007/> [[Parallax]] measurements indicate this star is located at a distance of about {{Convert|194|ly|pc|abbr=off|lk=on}} from [[Earth]].<ref name=aaa474_2_653/> | |
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| This is a [[spectroscopic binary]] system,<ref name=SIMBAD/> consisting of an [[orbit]]ing pair of stars that have not been individually resolved with a telescope. Their [[orbital period]] is 257.8 days and the [[orbital eccentricity|eccentricity]] is 0.17.<ref name=pdaov15_121/> The pair form an eclipsing binary of the [[Beta Lyrae variable|Beta Lyrae type]] and a period of 130.5 days, or one half of their orbital period. The eclipse of the primary component causes a decline of 0.04 magnitudes, while the secondary eclipse reduces the magnitude by 0.03.<ref name=oejvs72_1_1/><ref name=gcvs/>
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| The combined [[stellar classification]] is K5 III,<ref name=houk1978/> which matches the [[spectrum]] of a [[giant star]]. The measured [[angular diameter]] of the primary star is {{nowrap|16.71 ± 2.84 [[milliarcsecond|mas]]}}.<ref name=aaa431_773/> At the estimated distance of this system, this yields a physical size of about 107 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> The primary component shows the behavior of a [[slow irregular variable]].<ref name=oejvs72_1_1/><ref name=gcvs/>
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| In addition to its binary components, Sigma Puppis has a more distant companion that has a matching [[proper motion]], suggesting that it may be gravitationally bound to the binary. This magnitude 8.5<ref name=plotner_mann2007/> star is at an [[angular separation]] of 22.4 [[arcsecond]]s with a [[position angle]] of 74° from Sigma Puppis, which is equivalent to a projected separation of 1,200 [[Astronomical Unit]]s.<ref name=burnham1978/> In 1970, American astronomer [[Olin J. Eggen]] suggested that Sigma Puppis belonged to a [[moving group]] of stars that share a similar motion through space, and thereby a common origin. It served as the [[wikt:eponym|eponym]] for this, the σ Puppis group.<ref name=pasp83_493_251/> The existence of this group was later brought into question.<ref name=aaa362_563/>
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| ==References==
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| {{reflist|30em|refs=
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| <ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 }}</ref>
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| <ref name=houk1978>{{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | publication-place=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan: distributed by University Microfilms International | year=1978 | bibcode=1978mcts.book.....H }}</ref>
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| <ref name=rgcrv>{{citation | last1=Evans | first1=D. S. | date=June 20–24, 1966 | editor1-last=Batten | editor1-first=Alan Henry | editor2-last=Heard | editor2-last=John Frederick | contribution=The Revision of the General Catalogue of Radial Velocities | title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | location=University of Toronto | publisher=International Astronomical Union | bibcode=1967IAUS...30...57E }}</ref>
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| <ref name=clpl4_99>{{citation | 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 | year=1966 | bibcode=1966CoLPL...4...99J }}</ref>
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| <ref name=pdaov15_121>{{citation | last1=Batten | first1=A. H. | last2=Fletcher | first2=J. M. | last3=Mann | first3=P. J. | title=Seventh catalogue of the orbital elements of spectroscopic binary systems. | journal=Publications of the Dominion Astrophysical Observatory Victoria | volume=15 | pages=121–295 | year=1978 | bibcode=1978PDAO...15..121B }} See pp. 150–151.</ref>
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| <ref name=SIMBAD>{{citation | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Sigma+Puppis | title =sig Pup -- Spectroscopic binary | publisher=[[Centre de Données astronomiques de Strasbourg]] | work=[[SIMBAD]] | accessdate=2010-01-05 }}</ref> | |
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| <ref name=aaa431_773>{{citation | last1=Richichi | pages=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}</ref>
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| <ref name=lang2006>{{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3 | publisher=Birkhäuser | year=2006 | isbn=3-540-29692-1 | url=http://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R<sub>*</sub>) is given by:
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| :<math>\begin{align} 2\cdot R_*
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| & = \frac{(10^{-3}\cdot 59.4\cdot 16.71)\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
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| & \approx 213.5\cdot R_{\bigodot}
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| \end{align}</math></ref>
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| <ref name=pasp83_493_251>{{citation | last1=Eggen | first1=O. J. | title=The ζ Herculis, σ Puppis, ∈ Indi, and η Cephei Groups of Old Disk Population Stars | journal=Publications of the Astronomical Society of the Pacific | volume=83 | issue=493 | page=251 |date=June 1971 | doi=10.1086/129119 | bibcode=1971PASP...83..251E }}</ref>
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| <ref name=aaa362_563>{{citation | last1=Taylor | first1=B. J. | title=A statistical analysis of the metallicities of nine old superclusters and moving groups | journal=Astronomy and Astrophysics | volume=362 | pages=563–579 |date=October 2000 | bibcode=2000A&A...362..563T }}</ref>
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| <ref name=burnham1978>{{citation | first1=Robert | last1=Burnham | title=Burnham's celestial handbook: an observer's guide to the universe beyond the solar system | volume=3 | series=Dover books explaining science | edition=2nd | publisher=Courier Dover Publications | year=1978 | isbn=0-486-23673-0 | page=150 | url=http://books.google.com/books?id=PJzIt3SIlkUC&pg=PA150 | accessdate=2012-01-11 }}</ref>
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| <ref name=plotner_mann2007>{{citation | first1=Tammy | last1=Plotner | first2=Terry | last2=Mann | title=The Night Sky Companion: A Yearly Guide to Sky-Watching | series=Patrick Moore's Practical Astronomy Series | publisher=Springer | year=2007 | isbn=0-387-71608-4 | page=156 | url=http://books.google.com/books?id=f42fFDCTF0MC&pg=PA156 | accessdate=2012-01-11 }}</ref>
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| <ref name=gcvs>{{citation | first1=N. N. | last1=Samus | first2=O. V. | last2=Durlevich | date=February 12, 2009 | title=GCVS Variability Types and Distribution Statistics of Designated Variable Stars According to their Types of Variability | publisher=Sternberg Astronomical Institute, Moscow University | url=http://www.sai.msu.su/gcvs/gcvs/iii/vartype.txt | accessdate=2012-04-18 }}</ref>
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| <ref name=oejvs72_1_1>{{citation | last1=Otero | first1=Sebastián A. | title=New Elements for 54 Eclipsing Binaries | journal=Open European Journal on Variable Stars | volume=72 | issue=1 | pages=1–19 |date=October 2007 | bibcode=2007OEJV...72....1O }}</ref>
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| <ref name=aaa382_1016>{{citation | display-authors=1 | last1=Costa | first1=J. M. | last2=da Silva | first2=L. | last3=do Nascimento | first3=J. D., Jr. | last4=De Medeiros | first4=J. R. | title=The tidal effects on the lithium abundance of binary systems with giant component | journal=Astronomy and Astrophysics | volume=382 | pages=1016–1020 |date=February 2002 | doi=10.1051/0004-6361:20011676 | bibcode=2002A&A...382.1016C |arxiv = astro-ph/0111539 }}</ref>
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| {{Sky|07|27|13.83|-|43|18|05.2}}
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| {{Stars of Puppis}}
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| [[Category:Puppis (constellation)]]
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| [[Category:Bayer objects|Puppis, Sigma]]
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| [[Category:Stars with proper names]]
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The writer's name is Andera and she thinks it sounds fairly good. To climb is something she would never give up. Alaska is exactly where he's always been living. Invoicing is my occupation.
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