{{Short description|Star in the constellation Puppis}} {{Lowercase title}} {{Starbox begin | name = k Puppis }} {{Starbox image | image= {{Location mark |image=Puppis constellation map.svg|alt=|float=center|width=240 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=k Pup |x=482|y=553 }} |caption=Location of k Puppis (circled) }} {{Starbox observe 2s | epoch=J2000.0 | | constell=Puppis | | component1 = k<sup>1</sup> Pup | ra1={{RA|07|38|49.380}}<ref name=TYC2/> | dec1={{DEC|-26|48|06.49}}<ref name=TYC2/> | appmag_v1=+4.50<ref name=Ducati/> | component2 = k<sup>2</sup> Pup | ra2={{RA|07|38|49.869}}<ref name=TYC2/> | dec2={{DEC|-26|48|13.80}}<ref name=TYC2/> | appmag_v2=+4.429<ref name=TYC2/> }} {{Starbox character | component = k<sup>1</sup> | class=B6 V<ref name=houk/> }} {{Starbox character|no_heading=y | component = k<sup>2</sup> | class=B5 IV<ref name=houk/> | variable = SX Ari<ref name=ibvs/> }} {{Starbox astrometry | parallax = 9.41 | p_error = 0.80 | parallax_footnote = <ref name=hipparcos/> | dist_ly = | dist_pc = }} {{Starbox astrometry|no_heading=y | component1 = k<sup>1</sup> | absmag_v=−1.19<ref name=schultz/> }} {{Starbox astrometry|no_heading=y | component1 = k<sup>2</sup> | absmag_v=−0.94<ref name=schultz/> }} {{Starbox detail | source = <ref name=schultz/> | component1 = k<sup>1</sup> | mass = {{val|4.3|0.3}} | radius = {{val|3.7|1.2|0.6}} | luminosity = 490 | temperature = {{val|13,600|1,200|fmt=commas}} | gravity = {{val|4.24|0.15}} | rotational_velocity = {{val|114|5}} | component2 = k<sup>2</sup> | mass2 = {{val|6.0|0.3}} | radius2 = {{val|3.0|0.7|0.3}} | luminosity2 = 1,202 | temperature2 = {{val|18,500|500|fmt=commas}} | gravity2 = {{val|4.10|0.15}} | rotational_velocity2 = {{val|61|5}} | age_myr2 = }} {{Starbox catalog | names = HIP 37229, CD−26 4707, NSV 3673 | component1 = k<sup>1</sup> | names1=HR 2948, HD 61555, SAO 174198 | component2 = k<sup>2</sup> | names2=HR 2949, HD 61556, SAO 174199 }} {{Starbox reference | Simbad = HIP+37229|sn=k Puppis | Simbad2 = HD+61555|sn2=k<sup>1</sup> | Simbad3 = HD+61556|sn3=k<sup>2</sup> }} {{Starbox end}}
'''k Puppis''' (k Pup, k Puppis) is a Bayer designation given to an optical double star in the constellation Puppis, the two components being '''k<sup>1</sup> Puppis''' and '''k<sup>2</sup> Puppis'''.
==Bayer designation== Note that the Bayer designation for this star is "k" not "kappa" ('''κ'''). In Bayer's original Uranometria, k Puppis was listed as ρ (rho) Navis.<ref name=uranometria/> When Lacaille broke apart the large constellation Argo Navis into Carina, Puppis, and Vela, he re-designated the stars with Greek letters in a single sequence across all three constellations. Additionally, Lacaille used Latin letters for many additional stars. κ (kappa) is in the constellation of Vela and so there is no kappa in Puppis.<ref name=ridpath/> The confusion also extends to the proper name Markab which properly applies to κ Velorum (and other stars) but which has also been used for k Puppis when it is called κ Puppis.<ref name=xref/>
==Description== [[File:K2PupLightCurve.png|thumb|left|A light curve for k<sup>2</sup> Puppis, plotted from ''TESS'' data<ref name=MAST/>]] Both k<sup>1</sup> Puppis and k<sup>2</sup> Puppis are bright blue B-type stars of nearly equal brightness, +4.50 and +4.62, respectively. To the naked eye, the pair has a combined magnitude of +3.80. On the sky, the two stars are separated by approximately 9.9 seconds of arc along PA 318°. The optical pair can be distinguished easily with a small telescope. The component k<sup>1</sup> Puppis is a binary star system in its own right, while k<sup>2</sup> Puppis is a variable star. Each star within the k Puppis optical pair is between 450 and 470 light years from Earth.
k Puppis is listed in the General Catalogue of Variable Stars as a suspected variable star, but the range and type are not stated. The ''International Bulletin of Variable Stars'' has since published research showing that k<sup>2</sup> Puppis is the variable component. It is an SX Arietis variable with a period of 1.9093 days which is also the rotational period of the star. The total amplitude is 0.015 apparent magnitude.<ref name=ibvs/>
k<sup>2</sup> Puppis is a chemically peculiar star with a strong magnetic field. It is classified as a He-weak star and in addition to a deficit of helium in its spectrum, it shows an overabundance of many iron peak and rare earth elements. All of its spectral lines show variability, probably due to variations in the chemical makeup of its atmosphere as it rotates.<ref name=schultz/>
==References== <references> <ref name=MAST>{{cite web |title=MAST: Barbara A. Mikulski Archive for Space Telescopes |url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html |publisher=Space Telescope Science Institute |access-date=26 September 2022}}</ref>
<ref name=hipparcos>{{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|last1=Van Leeuwen|first1=F|year=2007|doi=10.1051/0004-6361:20078357|arxiv=0708.1752|s2cid=18759600}}</ref>
<ref name=xref>{{cite journal|bibcode=2004yCat.4027....0K|title=VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)|journal=VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002)|volume=4027|last1=Kostjuk|first1=N. D.|year=2004}}</ref>
<ref name=uranometria>{{cite web|url=http://stars.lindahall.org/bayb.htm|title=Linda Hall Library Bayer, Johann, Explicatio...Uranometrias|access-date=2016-10-14}}</ref>
<ref name=ridpath>{{cite web |url=http://www.ianridpath.com/startales/argo.htm |title=Argo Navis |author=Ian Ridpath |author-link=Ian Ridpath |website=Star Tales |access-date=27 Jan 2015 }}</ref>
<ref name=TYC2>{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author1=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}</ref>
<ref name=Ducati>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati, J. R.|year=2002}}</ref>
<ref name=houk>{{cite journal|bibcode=1982mcts.book.....H|title=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0|journal=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0|last1=Houk|first1=N|year=1982}}</ref>
<ref name=ibvs>{{cite journal|bibcode=2003IBVS.5397....1R|title=A New Bright Helium Variable B Star: HR 2949|journal=Information Bulletin on Variable Stars|volume=5397|pages=1|last1=Rivinius|first1=Th|last2=Stahl|first2=O|last3=Baade|first3=D|last4=Kaufer|first4=A|year=2003}}</ref>
<ref name=schultz>{{cite journal|bibcode=2015MNRAS.449.3945S|title=The magnetic field and spectral variability of the He-weak star HR 2949|journal=Monthly Notices of the Royal Astronomical Society|volume=449|issue=4|pages=3945|last1=Shultz|first1=M|last2=Rivinius|first2=Th|last3=Folsom|first3=C. P|last4=Wade|first4=G. A|last5=Townsend|first5=R. H. D|last6=Sikora|first6=J|last7=Grunhut|first7=J|last8=Stahl|first8=O|author9=MiMeS Collaboration|year=2015|doi=10.1093/mnras/stv564|doi-access=free |arxiv=1504.03289}}</ref> </references>
==External links== * [http://www.dibonsmith.com/pup_con.htm Puppis]
{{Stars of Puppis}}
<!-- k1A & k2 --> <!-- k2 --> <!-- k1 -->
<!--fr:k Puppis--> <!--ja:とも座k星-->
<!-- k1 -->
Puppis, k k Puppis k Puppis <!-- k1A & k2 --> k Puppis <!-- k --> k1 Puppis Category:B-type main-sequence stars 2948 9 037229 061555 6 Category:Suspected variables Category:Durchmusterung objects Category:SX Arietis variables Category:Helium-weak stars