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{{Short description|Star in the constellation Ara}}
{{Starbox begin
| name = Iotaι Arae
}}
{{Starbox image
| image =
{{Location mark
<div style="position: relative">[[File:Ara IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Ara constellation and its surroundings]]
|image=Ara constellation map.svg|alt=|float=center|width=240
<div style="position: absolute; left: 50.4%; top: 24.6%;">[[File:Cercle rouge 100%.svg|12px]]</div>
|label=|position=right
</div>
|mark=Red circle.svg|mark_width=10|mark_link=ι Arae
| caption = The location of ι Arae (circled)▼
|x=542|y=352
}}
▲ | caption = The locationLocation of ι Arae (circled)
}}
{{Starbox observe
| epoch = J2000
| ra = {{RA|17|23|16.0771507624}}<ref name=aaa474_2_653dr3/>
| dec = {{DEC|–47-47|28|05.50735057}}<ref name=aaa474_2_653dr3/>
| appmag_v = 5.24518 - 5.26<ref name=aaa515_A11gcvs/>
| constell = [[Ara (constellation)|Ara]]
}}
{{Starbox character
| class = B2&nbsp;IVe + sdO<ref name=wang>{{Cite journal |last1=Wang |first1=Luqian |last2=Gies |first2=Douglas R. |last3=Peters |first3=Geraldine J. |last4=Han |first4=Zhanwen |date=April 2023 |title=The Orbital and Physical Properties of Five Southern Be+sdO Binary Systems |journal=The Astronomical Journal |language=en |volume=165 |issue=5 |pages=203 |doi=10.3847/1538-3881/acc6ca |doi-access=free |arxiv=2303.12616 |bibcode=2023AJ....165..203W |issn=1538-3881}}</ref>
| class = B2&nbsp;IIIne<ref name=apj157_313/>▼
| r-i = –0−0.08
| v-r =
| b-v = –0−0.11<ref name=aass61_387/>
| u-b = –0−0.82<ref name=aass61_387/>
| variable = [[Be star|BE]]<ref name=gcvs/>
}}
{{Starbox astrometry
| radial_v = –19−19<ref name=rgcrv1966/>
| prop_mo_ra = –4−6.35209<ref name=aaa474_2_653dr3/>
| prop_mo_dec = –17−17.59699<ref name=aaa474_2_653dr3/>
| parallax = 3.495613
| p_error = 0.260904
| parallax_footnote = <ref name=aaa474_2_653dr3/>
| absmag_v = −2.06<ref name=Anderson2012/>
}}
{{Starbox orbit
| reference = <ref name=wang/>
| period_unitless = 176.17 ± 0.04 d
| periastron = HJD 2458654.2 ± 0.5
| k1 = 5.80 ± 0.06
| k2 = 57.6 ± 0.6
| inclination = 46 ± 6
}}
{{Starbox detail
| component1 = &iota; Ara A
| mass = {{nowrapval|8.3 ± |0.4}}<ref name=mnras410_1_190/>
| radius =
▲ | class radius = B2&nbsp;IIIne6.3<ref name=apj157_313dr3/>
| luminosity =
| luminosity_bolometricluminosity = 510,740864<ref name=an331_4_349zorec2016/>
| temperature = 2120,380172<ref name=aaa515_A11dr3/>
| metal_fe =
| gravity = 4.1018<ref name=aaa515_A11zorec2016/>
| rotational_velocity = 375340<ref name=coapa239_1zorec2016/>
| age_myr = {{nowrapval|30.0 ± |7.4}}<ref name=mnras410_1_190/>
| component2 = &iota; Ara B
| mass2 = {{val|1.06|0.29}}<ref name=wang/>
| temperature2 = 33,800<ref name=wang2021>{{cite journal | doi= 10.3847/1538-3881/abf144 | doi-access= free | title= The Detection and Characterization of Be+sdO Binaries from HST/STIS FUV Spectroscopy | date= 2021 | last1= Wang | first1= Luqian | last2= Gies | first2= Douglas R. | last3= Peters | first3= Geraldine J. | last4= Götberg | first4= Ylva | last5= Chojnowski | first5= S. Drew | last6= Lester | first6= Kathryn V. | last7= Howell | first7= Steve B. | journal= The Astronomical Journal | volume= 161 | issue= 5 | page= 248 | arxiv= 2103.13642 | bibcode= 2021AJ....161..248W }}</ref>
| radius2 = {{val|0.61|0.09}}<ref name=wang2021/>
| luminosity2 = 437<!-- log(L) = 2.64 --><ref name=wang2021/>
}}
{{Starbox catalog
| names = ι Ara, [[Durchmusterung|CD]]&nbsp;–47−47°&nbsp;11484, [[FK5]] 3379, [[Henry Draper Catalogue|HD]] 157042, [[Hipparcos catalogue|HIP]]&nbsp;85079, [[Bright Star Catalogue|HR]] 6451, [[New Catalogue of Suspected Variable Stars|NSV]] 8566, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;227886.<ref name=SIMBAD/>
}}
{{Starbox reference
Line 53 ⟶ 69:
{{Starbox end}}
 
'''Iota Arae''', [[Latinisation of names|Latinized]] from ι Arae, is the [[Bayer designation]] for a [[star]] in the southern [[constellation]] of [[Ara (constellation)|Ara]]. It is approximately {{Convert|930281|pc|ly|pc|abbr=off|lk=on|order=flip}}<ref name=aaa474_2_653/> from [[Earth]], give or take a 7020&nbsp;light-year [[margin of error]], and has an [[apparent visual magnitude]] of 5.252.<ref name=aass61_387/> Based upon the [[Bortle Dark-Sky Scale]], this means the star is visible to the naked eye from suburban skies.
 
This is an [[stellar evolution|evolved]] [[giantsubgiant star]] with a [[stellar classification]] of B2&nbsp;IIIneIVe.<ref name=apj157_313wang/> The 'e' notation indicates the [[stellar spectrum|spectrum]] displays [[emission line]]s, which means this is a [[Be star]] that is surrounded by hot, circumstellar gas. It is spinning rapidly with a [[projected rotational velocity]] of 375&nbsp;{{val|340|u=km/s}}.<ref name=coapa239_1/> The [[Doppler effect]] from this rotation is causing the [[absorption line]]s to widen and become nebulous, as indicated by the 'n' notation in the stellar class. It is a [[spectroscopic binary]], and is in an orbit with a second, smaller component, a [[subdwarf O star]].<ref name=wang/>
 
[[File:IotaAraLightCurve.png|thumb|left|A [[light curve]] for Iota Arae, plotted from ''[[Transiting Exoplanet Survey Satellite|TESS]]'' data<ref name=MAST/>]]
Iota Arae has around 8.3<ref name=mnras410_1_190/> times the mass of the Sun and is shining brightly with 510,740<ref name=an331_4_349/>864 times the Sun's luminosity. This energy is being radiated into space from the [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 21{{val|fmt=commas|20,380&nbsp;172|ul=K}},<ref name=aaa515_A11/> giving it the characteristic blue-white hue of a [[B-type star]].<ref name=csiro/>
The [[General Catalog of Variable Stars]] classifies it as a BE variable star, ranging from [[Photometric_systemPhotometric system#Photometric_lettersPhotometric letters|visual]] magnitude 5.18 to 5.26 with a period of 13.36 hours.<ref name=gcvs/> In a study of the ''[[Hipparcos]]'' data, it was found to vary in brightness by 0.054 in magnitude with no clear period.<ref name=aaa507_2_11411201/>
{{clear left}}
 
==References==
{{reflist|refs=
 
<ref name=dr3>{{cite Gaia DR3|5950328750846409856}}</ref>
<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 | postscript=. |arxiv = 0708.1752 | s2cid=18759600 }}</ref>
 
<ref name=zorec2016>{{cite journal
| title=Critical study of the distribution of rotational velocities of Be stars. I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity
| journal=Astronomy & Astrophysics | display-authors=1
| last1=Zorec | first1=J. | last2=Frémat | first2=Y.
| last3=Domiciano de Souza | first3=A. | last4=Royer | first4=F.
| last5=Cidal | first5=L. | last6=Hubert | first6=A. -M.
| last7=Seemann | first7=T. | last8=Martayan | first8=C.
| last9=Cochetti | first9=Y. R. | last10=Arias | first10=M. L.
| last11=Aidelman | first11=Y. | last12=Stee | first12=P.
| volume=595 | date=November 2016 | pages=26
| bibcode=2016A&A...595A.132Z | doi=10.1051/0004-6361/201628760 | doi-access=free | hdl=11336/37946 | hdl-access=free }}</ref>
 
<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>
 
<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=8 December 2021}}</ref>
<ref name=Anderson2012>{{citation▼
 
▲<ref name=Anderson2012>{{citationcite journal
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
Line 73 ⟶ 105:
| 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=apj157_313>{{citation | last1=Hiltner | first1=W. A. | last2=Garrison | first2=R. F. | last3=Schild | first3=R. E. | title=MK Spectral Types for Bright Southern OB Stars | journal=Astrophysical Journal | volume=157 | page=313 |date=July 1969 | doi=10.1086/150069 | bibcode=1969ApJ...157..313H | postscript=. }}</ref>
 
<ref name=rgcrv1966>{{citation | last=Evans | first=D. S. | date=June 20–24, 1966 | editor1-first=Batten | editor1-last=Alan Henry | editor2-first=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 | volume=30 | page=57 | location=University of Toronto | publisher=[[International Astronomical Union]] | bibcode=1967IAUS...30...57E | postscript=. }}</ref>▼
 
<ref name=coapa239_1>{{citation | last1=Bernacca | first1=P. L. | last2=Perinotto | first2=M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | year=1970 | page=1 | bibcode=1970CoAsi.239....1B | postscript=. }}</ref>
 
<ref name=aass61_387>{{citation | last1=Kozok | first1=J. R. | title=Photometric observations of emission B-stars in the southern Milky Way | journal=Astronomy and Astrophysics Supplement Series | volume=61 | pages=387–405 |date=September 1985 | bibcode=1985A&AS...61..387K | postscript=. }}</ref>
 
▲<ref name=rgcrv1966>{{citationcite conference | last=Evans | first=D. S. | date=June 20–24, 1966 | editor1-first=Batten | editor1-last=Alan Henry | editor2-first=Heard | editor2-last=John Frederick | contribution=The Revision of the General Catalogue of Radial Velocities | titlejournal=Determination of Radial Velocities and theirTheir Applications, |title=Proceedings from IAU Symposium no. 30 | volume=30 | page=57 | location=University of Toronto | publisher=[[International Astronomical Union]] | bibcode=1967IAUS...30...57E | postscript=. }}</ref>
<ref name=mnras410_1_190>{{citation | 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 | bibcode=2011MNRAS.410..190T | postscript=. |arxiv = 1007.4883 | s2cid=118629873 }}</ref>
 
<ref name=aaa515_A11aass61_387>{{citationcite journal | last1=SoubiranKozok | first1=C. | last2=Le Campion | first2=J.-F. | last3=Cayrel de Strobel | first3=GR. | last4title=CailloPhotometric |observations first4=A.of |emission title=TheB-stars PASTELin cataloguethe ofsouthern stellarMilky parametersWay | journal=Astronomy and Astrophysics Supplement Series | volume=51561 | pagepages=A111387–405 |date=JuneSeptember 2010 | doi=10.1051/0004-6361/2010142471985 | bibcode=2010A1985A&AAS...515A61.111S | postscript=. |arxiv = 1004.1069 | s2cid=118362423387K }}</ref>
 
<ref name=an331_4_349mnras410_1_190>{{citationcite journal | last1=HohleTetzlaff | first1=M. MN. | last2=Neuhäuser | first2=R. | last3=SchutzHohle | first3=BM. FM. | title=MassesA and luminositiescatalogue of O-young andrunaway B-typeHipparcos stars andwithin red3 supergiantskpc from the Sun | journal=Astronomische[[Monthly Notices of the Royal Astronomical NachrichtenSociety]] | volume=331410 | issue=41 | pagepages=349190–200 |date=AprilJanuary 20102011 | doi=10.10021111/asnaj.1365-2966.2010.17434.200911355x | bibcodedoi-access=2010AN....331..349Hfree | postscriptbibcode=2011MNRAS.410..190T |arxiv = 10031007.23354883 | s2cid=111387483118629873 }}</ref>
 
<ref name=aaa507_2_11411201>{{citationcite journal | display-authors=1 | last1=Lefèvre | first1=L. | last2=Marchenko | first2=S. V. | last3=Moffat | first3=A. F. J. | last4=Acker | first4=A. | title=A systematic study of variability among OB-stars based on HIPPARCOS photometry | journal=Astronomy and Astrophysics | volume=507 | issue=2 | pages=11411201 |date=November 2009 | doi=10.1051/0004-6361/200912304 | bibcode=2009A&A...507.1141L | doi-access=free }}</ref>
 
<ref name=csiro>{{citationcite web|title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=[[Commonwealth Scientific and Industrial Research Organisation]] |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |access-date=2012-01-16 |url-status=dead |archive-url=https://web.archive.org/web/20120222183238/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archive-date=February 22, 2012 }}</ref>
 
<ref name=SIMBAD>{{cite simbad | title=iot Ara | access-date=2010-07-30 | postscript=. }}</ref>
 
}}
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[[Category:Bayer objects|Arae, Iota]]
[[Category:Ara (constellation)]]
[[Category:B-type giantssubgiants]]
[[Category:Be stars]]
[[Category:Spectroscopic binaries]]
[[Category:Durchmusterung objects|BD-47 11484]]
[[Category:Hipparcos objects|085079]]
Retrieved from "https://en.wikipedia.org/wiki/Iota_Arae"