{{Short description|Star in the constellation Chamaleon}} {{Starbox begin |Name:DI Cha |Discovered by = Judy Schmidt{{citation needed|date=December 2015}} }} {{Starbox image | image = 280px | caption = Image showing DI Cha A and B, each of which is also an even closer binary, and the surrounding nebulosity. }} {{Starbox observe 2s | epoch = J2000 | constell = Chamaeleon | component1 = A | ra1 = {{RA|11|07|20.72761}}<ref name = GaiaDR3/> | dec1 = {{DEC|−77|38|07.3081}}<ref name = GaiaDR3/> | appmag_v1 = 10.72<ref name=msc/> | component2 = A | ra2 = {{RA|11|07|20.18917}}<ref name = GaiaDR3B/> | dec2 = {{DEC|−77|38|11.5657}}<ref name = GaiaDR3B/> | appmag_v2 = 16.7<ref name=msc/> }} {{Starbox character | class = G0e<ref name=torres/> (G2 + M6 + M5.5 + M5.5)<ref name=schmidt/> | b-v = +1.144<ref name=kilkenny/> | u-b = +0.630<ref name=kilkenny/> | variable = T Tau<ref name=gcvs/> }} {{Starbox astrometry | component1 = A | radial_v = +12.040{{±|0.140}}<ref name=Nguyen2012/> | prop_mo_ra = −22.552 | prop_mo_dec = +1.214 | pm_footnote = <ref name = GaiaDR3/> | parallax = 5.2913 | p_error = 0.0133 | parallax_footnote = <ref name = GaiaDR3/> | absmag_v = | component2 = B | radial_v2 = {{val|+15.5|0.3}}<ref name=eso/> | prop_mo_ra2 = −21.477 | prop_mo_dec2 = +1.289 | pm_footnote2 = <ref name = GaiaDR3B/> | parallax2 = 5.2190 | p_error2 = 0.0719 | parallax_footnote2 = <ref name = GaiaDR3B/> | absmag_v2 = }} {{Starbox detail | source = <ref name=daemgen/> | component1 = Aa | mass = 1.7 | radius = 2.00 | temperature = 6,030 | luminosity = 4.7 | age_myr = 7.1 | component2 = Ba/Bb | mass2 = 0.18 | radius2 = 1.13 | temperature2 = 3,130 | luminosity2 = 0.11 | age_myr2 = 3.0 }} {{Starbox catalog | names=DI Cha, HIP 54365, CD−76°486, WDS J11073-7738, AAVSO 1104-77 }} {{Starbox reference |Simbad=DI+Char |Simbad2=TIC+454291766|sn2=B }} {{Starbox end}} '''DI Chamaeleontis''', also known as Hen 3-593 or HIP 54365, is a quadruple star system in the constellation Chamaeleon. The system is located 616 light years away from Earth based on Gaia DR3 parallax measurements.<ref name = GaiaDR3/>
[[File:DIChaLightCurve.png|thumb|left|A light curve for DI Chamaeleontis, plotted from ''TESS'' data,<ref name=MAST/>]] DI Cha is a variable star of the T Tauri type, young stellar objects just approaching the main sequence. It varies erratically between visual magnitudes 10.65 and 10.74.<ref name=gcvs/> Although it is visually faint, it was noticed because of the prominent emission lines in its spectrum.<ref name=henize/>
In 1977, DI Cha was observed to have a much fainter companion.<ref name=schwartz/> The separation was later measured at 4.6", approximately 644 astronomical units (AU).<ref name=reipurth/> The B component was discovered to be a pair of stars separated by only 0.066", about 10 AU,<ref name=lafreniere/> both with spectral type M5.5.<ref name=schmidt/> Finally, the variable primary star was found to have a faint companion 0.2" (therefore ~30 AU) away, of spectral type M6.<ref name=schmidt/> {{clear left}} ==References== <references>
<ref name=msc>{{cite journal |last1=Tokovinin |first1=Andrei |title=The Updated Multiple Star Catalog |journal=The Astrophysical Journal Supplement Series |date=2018 |volume=235 |issue=1 |page=6 |doi=10.3847/1538-4365/aaa1a5 |doi-access=free |arxiv=1712.04750 |bibcode=2018ApJS..235....6T }}</ref>
<ref name=eso>{{cite journal |last1=Gutiérrez Albarrán |first1=M. L. |last2=Montes |first2=D. |last3=Gómez Garrido |first3=M. |last4=Tabernero |first4=H. M. |last5=González Hernández |first5=J. I. |last6=Marfil |first6=E. |last7=Frasca |first7=A. |last8=Lanzafame |first8=A. C. |last9=Klutsch |first9=A. |last10=Franciosini |first10=E. |last11=Randich |first11=S. |last12=Smiljanic |first12=R. |last13=Korn |first13=A. J. |last14=Gilmore |first14=G. |last15=Alfaro |first15=E. J. |last16=Baratella |first16=M. |last17=Bayo |first17=A. |last18=Bensby |first18=T. |last19=Bonito |first19=R. |last20=Carraro |first20=G. |last21=Delgado Mena |first21=E. |last22=Feltzing |first22=S. |last23=Gonneau |first23=A. |last24=Heiter |first24=U. |last25=Hourihane |first25=A. |last26=Jiménez Esteban |first26=F. |last27=Jofre |first27=P. |last28=Masseron |first28=T. |last29=Monaco |first29=L. |last30=Morbidelli |first30=L. |display-authors=1 |title=The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. I. Cluster age range and initial membership selections |journal=Astronomy and Astrophysics |date=2020 |volume=643 |pages=A71 |doi=10.1051/0004-6361/202037620 |arxiv=2009.00610 |bibcode=2020A&A...643A..71G }}</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=27 August 2024}}</ref>
<ref name = GaiaDR3>{{Cite DR3|5201129121134048768}}</ref>
<ref name = GaiaDR3B>{{Cite DR3|5201129116838717312}}</ref>
<ref name=kilkenny>{{cite journal|bibcode=1985SAAOC...9...55K|title=Optical and infrared photometry of southern early-type shell stars and pre-main-sequence variables|journal=In Its South African Astronomical Observatory Circular No. 9 P 55-86 (SEE N86-18271 08-89)|volume=9|last1=Kilkenny|first1=D.|last2=Whittet|first2=D. C. B.|last3=Davies|first3=J. K.|last4=Evans|first4=A.|last5=Bode|first5=M. F.|last6=Robson|first6=E. I.|last7=Banfield|first7=R. M.|year=1985|page=55}}</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=torres>{{cite journal|bibcode=2006A&A...460..695T|arxiv=astro-ph/0609258|title=Search for associations containing young stars (SACY). I. Sample and searching method|journal=Astronomy and Astrophysics|volume=460|issue=3|pages=695|last1=Torres|first1=C. A. O.|last2=Quast|first2=G. R.|last3=Da Silva|first3=L.|last4=de la Reza|first4=R.|last5=Melo|first5=C. H. F.|last6=Sterzik|first6=M.|year=2006|doi=10.1051/0004-6361:20065602|s2cid=16080025}}</ref>
<ref name=schmidt>{{cite journal|bibcode=2013A&A...557A..80S|arxiv=1307.1082|title=New companions in the stellar systems of DI Cha, Sz 22, CHXR 32, and Cha Hα 5 in the Chamaeleon I star-forming region|journal=Astronomy & Astrophysics|volume=557|pages=A80|last1=Schmidt|first1=T. O. B.|last2=Vogt|first2=N.|last3=Neuhäuser|first3=R.|last4=Bedalov|first4=A.|last5=Roell|first5=T.|year=2013|doi=10.1051/0004-6361/201220660|s2cid=67802847}}</ref>
<ref name=henize>{{cite journal|bibcode=1963AJ.....68S.280H|title=Emission-Line Stars in an Obscured Region in Chamaeleon|journal=Astronomical Journal|volume=68|pages=280|last1=Henize|first1=Karl G.|year=1963|doi=10.1086/109141|url=http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963AJ.....68S.280H&link_type=ARTICLE&db_key=AST&high=}}</ref>
<ref name=schwartz>{{cite journal|bibcode=1977ApJS...35..161S|title=A survey of southern dark clouds for Herbig-Haro objects and H-alpha emission stars|journal=Astrophysical Journal Supplement Series|volume=35|pages=161|last1=Schwartz|first1=R. D.|year=1977|doi=10.1086/190473}}</ref>
<ref name=Nguyen2012>{{cite journal | title=Close Companions to Young Stars. I. A Large Spectroscopic Survey in Chamaeleon I and Taurus-Auriga | last1=Nguyen | first1=Duy Cuong | last2=Brandeker | first2=Alexis | last3=van Kerkwijk | first3=Marten H. | last4=Jayawardhana | first4=Ray | journal=The Astrophysical Journal | volume=745 | issue=2 | id=119 | pages=25 | date=February 2012 | doi=10.1088/0004-637X/745/2/119 | arxiv=1112.0002 | bibcode=2012ApJ...745..119N | s2cid=119265730 | doi-access = free}}</ref>
<ref name=reipurth>{{cite journal|bibcode=1993A&A...278...81R|title=Visual binaries among pre-main sequence stars|journal=Astronomy and Astrophysics|volume=278|pages=81|last1=Reipurth|first1=Bo|last2=Zinnecker|first2=Hans|year=1993}}</ref>
<ref name=lafreniere>{{cite journal|bibcode=2008ApJ...683..844L|arxiv=0803.0561|title=A Multiplicity Census of Young Stars in Chamaeleon I|journal=The Astrophysical Journal|volume=683|issue=2|pages=844–861|last1=Lafrenière|first1=David|last2=Jayawardhana|first2=Ray|last3=Brandeker|first3=Alexis|last4=Ahmic|first4=Mirza|last5=Van Kerkwijk|first5=Marten H.|year=2008|doi=10.1086/590239|s2cid=2998049}}</ref>
<ref name=daemgen>{{cite journal|bibcode=2013A&A...554A..43D|arxiv=1304.1150|title=Protoplanetary disk evolution and stellar parameters of T Tauri binaries in Chamaeleon I|journal=Astronomy & Astrophysics|volume=554|pages=A43|last1=Daemgen|first1=S.|last2=Petr-Gotzens|first2=M. G.|last3=Correia|first3=S.|last4=Teixeira|first4=P. S.|last5=Brandner|first5=W.|last6=Kley|first6=W.|last7=Zinnecker|first7=H.|year=2013|doi=10.1051/0004-6361/201321220|s2cid=59440639}}</ref>
</references>
{{Stars of Chamaeleon}}
4 Category:G-type main-sequence stars Category:M-type main-sequence stars Category:T Tauri stars Category:Chamaeleon Chamaeleontis, DI 054365 Category:Durchmusterung objects