HD 143699

{{Short description|Star in the constellation of 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=HD 143699 |x=148|y=600 }} | caption = Location of HD 143699 (circled in red) }} {{Starbox observe | epoch = J2000 | constell = [[Lupus (constellation)|Lupus]]<ref name=Anderson2012/> | ra = {{RA|16|03|24.18956}}<ref name=GaiaDR2/> | dec = {{DEC|−38|36|09.1424}}<ref name=GaiaDR2/> | appmag_v = 4.90<ref name=Anderson2012/> }} {{Starbox character | type = [[main sequence]]<ref name=zorec2012/> | class = B5/7 III/IV<ref name=houk1979/> | b-v = {{Val|−0.146|0.043}}<ref name=Anderson2012/> }} {{Starbox astrometry | radial_v = {{Val|−1.9|2.8}}<ref name=Anderson2012/> | prop_mo_ra = −18.488<ref name=GaiaDR2/> | prop_mo_dec = −28.147<ref name=GaiaDR2/> | parallax = 9.2268 | p_error = 0.4693 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = −0.54<ref name=Anderson2012/> }} {{Starbox detail | mass = 4.58<ref name=shultz2022/> | radius = 3.89<ref name=glagolevskij2019/> | luminosity = 447<ref name=shultz2022/> | gravity = 3.82<ref name=glagolevskij2019/> | temperature = 15,480<ref name=glagolevskij2019/> | metal_fe = | rotation = 0.894 days<ref name=shultz2022/> | rotational_velocity = 115<ref name=shultz2022/> | age_myr = 60<ref name=glagolevskij2019/> }} {{Starbox catalog | names={{odlist | CD=−38°10832 | FK5=3267 | HD=143699 | HIP=78655 | HR=5967 | SAO=207276 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+143699 }} {{Starbox end}}

'''HD 143699''' is a single<ref name=Eggleton2008/> [[star]] in the southern [[constellation]] of [[Lupus (constellation)|Lupus]]. It is a dim star but visible to the naked eye with an [[apparent visual magnitude]] of 4.90.<ref name=Anderson2012/> Based upon an annual [[stellar parallax|parallax shift]] of {{Val|9.2|ul=mas}},<ref name=GaiaDR2/> it is located around 350 [[light year]]s away. It is most likely (90%<ref name=Rizzuto2011/> chance) a member of the Upper Centaurus–Lupus<ref name=Bobylev2007/> subgroup of the [[Sco OB2]] [[moving group]].

This star has a [[stellar classification]] of B5/7 III/IV,<ref name=houk1979/> suggesting it is an [[stellar evolution|evolving]] star that is entering the [[giant star|giant stage]]. However, according to Zorec and Royer (2012) it is only 56% of the way through its [[main sequence]] lifespan.<ref name=zorec2012/> It is a [[Chemically peculiar star|chemically peculiar]] [[stellar magnetic field|magnetic]] B star,<ref name=Linsky1992/> showing an averaged quadratic [[magnetic field|field strength]] of {{Val|167.2|140.4|e=−3|ul=T}}.<ref name=bychkov2009/> Helium-weak, it displays an underabundance of helium in its [[stellar spectrum|spectrum]].<ref name=Kilambi1992/> [[Radio]] emissions have been detected from this source.<ref name=Linsky1992/>

HD 143699 has 4.6 times the [[mass of the Sun]]<ref name=shultz2022/> and 3.9 times the [[Sun's radius]].<ref name=glagolevskij2019/> It has a high rate of spin with a [[projected rotational velocity]] of 115 km/s, resulting in a short rotation period of 0.894 days.<ref name=shultz2022/> The star is radiating 447 times the [[Sun's luminosity]]<ref name=shultz2022/> from its [[photosphere]] at an [[effective temperature]] of {{val|fmt=commas|15480|ul=K}}.<ref name=glagolevskij2019/>

==References== <references>

<ref name=SIMBAD>{{cite simbad | title=HD 143699 | access-date=2018-07-29 }}</ref>

<ref name=glagolevskij2019>{{cite journal |last1=Glagolevskij |first1=Yu. V. |title=On Properties of Main Sequence Magnetic Stars |journal=Astrophysical Bulletin |date=2019 |volume=74 |issue=1 |page=66 |doi=10.1134/S1990341319010073 |bibcode=2019AstBu..74...66G }}</ref>

<ref name=shultz2022>{{cite journal |last1=Shultz |first1=M. E. |last2=Owocki |first2=S. P. |last3=Ud-Doula |first3=A. |last4=Biswas |first4=A. |last5=Bohlender |first5=D. |last6=Chandra |first6=P. |last7=Das |first7=B. |last8=David-Uraz |first8=A. |last9=Khalack |first9=V. |last10=Kochukhov |first10=O. |last11=Landstreet |first11=J. D. |last12=Leto |first12=P. |last13=Monin |first13=D. |last14=Neiner |first14=C. |last15=Rivinius |first15=Th |last16=Wade |first16=G. A. |title=MOBSTER - VI. The crucial influence of rotation on the radio magnetospheres of hot stars |journal=Monthly Notices of the Royal Astronomical Society |date=2022 |volume=513 |issue=1 |page=1429 |doi=10.1093/mnras/stac136 |doi-access=free |arxiv=2201.05512 |bibcode=2022MNRAS.513.1429S }}</ref>

<ref name=houk1979>{{citation | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=3 | last1=Houk | first1=Nancy | publication-place=Ann Arbor, Michigan | publisher=Dept. of Astronomy, University of Michigan | year=1979 | bibcode=1982mcts.book.....H | postscript=. }}</ref>

<ref name=zorec2012>{{citation | title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities | journal=Astronomy & Astrophysics | last1=Zorec | first1=J. | last2=Royer | first2=F. | volume=537 | pages=A120 | year=2012 | doi=10.1051/0004-6361/201117691 | bibcode=2012A&A...537A.120Z | arxiv=1201.2052 | s2cid=55586789 | postscript=. }}</ref>

<ref name=Rizzuto2011>{{citation | display-authors=1 | last1=Rizzuto | first1=Aaron | last2=Ireland| first2=Michael | last3=Robertson | first3=J. G. | title=Multidimensional Bayesian membership analysis of the Sco OB2 moving group | journal=Monthly Notices of the Royal Astronomical Society |date=October 2011 | volume=416 | issue=4 | pages=3108–17 | doi=10.1111/j.1365-2966.2011.19256.x | doi-access=free | bibcode=2011MNRAS.416.3108R | arxiv=1106.2857 | s2cid=54510608 | postscript=. }}</ref>

<ref name=Kilambi1992>{{citation | title=Mid-ultraviolet and optical photometry of helium stars | display-authors=1 | last1=Kilambi | first1=Gopal C. | last2=Nagar | first2=Praveen | last3=Kameswara Rao| first3=N. | journal=Journal of Astrophysics and Astronomy | volume=13 | pages=175–194 | date=June 1992 | issue=2 | doi=10.1007/BF02702309 | bibcode=1992JApA...13..175K | s2cid=119896529 }}</ref>

<ref name=Linsky1992>{{citation | title=Radio Emission from Chemically Peculiar Stars | display-authors=1 | last1=Linsky | first1=Jeffrey L. | last2=Drake | first2=Stephen A. | last3=Bastian | first3=T. S. | journal=Astrophysical Journal | postscript=. | volume=393 | page=341 | date=July 1992 | doi=10.1086/171509 | bibcode=1992ApJ...393..341L | doi-access=free }}</ref>

<ref name=Bobylev2007>{{citation | title=Kinematics of the Scorpius–Centaurus OB association | last1=Bobylev | first1=V. V. | last2=Bajkova | first2=A. T. | journal=Astronomy Letters | volume=33 | issue=9 | pages=571–583 | date=September 2007 | doi=10.1134/S1063773707090010 | bibcode=2007AstL...33..571B | postscript=. |arxiv = 0708.0943 | s2cid=15785349 }}</ref>

<ref name=Eggleton2008>{{citation | title=A catalogue of multiplicity among bright stellar systems | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869 | date=2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | arxiv=0806.2878 | bibcode=2008MNRAS.389..869E | s2cid=14878976 | postscript=. }}</ref>

<ref name=bychkov2009>{{citation | display-authors=1 | last1=Bychkov | first1=V. D. | last2=Bychkova | first2=L. V. | last3=Madej | first3=J. | title=Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars | journal=Monthly Notices of the Royal Astronomical Society | volume=394 | issue=3 | pages=1338 | year=2009 | postscript=. | doi=10.1111/j.1365-2966.2008.14227.x | bibcode=2009MNRAS.394.1338B | s2cid=120268049 | doi-access=free }}</ref>

</references>

[[Category:B-type subgiants]] [[Category:Helium-weak stars]] [[Category:Lupus (constellation)]] [[Category:Durchmusterung objects|CD-38 10832]] [[Category:Henry Draper Catalogue objects|143699]] [[Category:Hipparcos objects|078655]] [[Category:Bright Star Catalogue objects|5967]]