{{Short description|T Tauri star; Chamaeleon}} {{Starbox begin | name = T Chamaeleontis }} {{Starbox image | image = 250px | caption = A visual band light curve for T Chamaeleontis, plotted from AAVSO data<ref name="aavso"/> }} {{Starbox observe | epoch = J2000.0 (ICRS) | constell = Chamaeleon | ra = {{RA|11|57|13.52451}}<ref name = GaiaDR3/> | dec = {{DEC|−79|21|31.5305}}<ref name = GaiaDR3/> | appmag_v = 10.05 - 14.50<ref name = ASSVO/> }} {{Starbox character | type = T Tauri star<ref name = Mauder1975/> | class = K0e<ref name = Torres2006/> | b-v = +1.14<ref name = Bastian1979/> | u-b = +0.63<ref name = Bastian1979/> | j-k = +1.67<ref name = Glass1974/> | variable = Orion variable<ref name = Samus2017/> }} {{Starbox astrometry | radial_v = 13.8{{±|0.1}}<ref name ="Zúñiga-Fernández2020"/> | parallax = 9.7356 | p_error = 0.0332 | parallax_footnote = <ref name = GaiaDR3/> | prop_mo_ra = −41.586 | prop_mo_dec = −8.655 | pm_footnote = <ref name = GaiaDR3/> | absmag_v = +6.55<ref name = Anderson2012/> }} {{Starbox detail | mass = 0.65<ref name = Baron2019/> | radius = 0.65{{±|0.09}}<ref name = Stassun2019/> | luminosity = 0.29<ref name = Sartori2003/> | gravity = 4.50<ref name = Sartori2003/> | temperature = 5,111<ref name="da Silva2009"/> | metal_fe = +0.09{{±|0.15}}<ref name = Bochanski2018/> | rotational_velocity = 39{{±|3}}<ref name = Covino1997/> | age_myr = 12.7<ref name = Murphy2013/> }} {{Starbox catalog | names = {{odlist|HIP = 58285|GSC = 09419-01187|2MASS = J11571348-7921313|TYC = 9419-1187-1|V = T Cha}} }} {{Starbox reference | Simbad = T+Cha }} {{Starbox end}}
'''T Chamaeleontis''' (T Cha), also known as '''HIP 58285''', is a T Tauri star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude that ranges from 10.05 to 14.50,<ref name = ASSVO/> which is below the limit for naked eye visibility. Gaia DR3 parallax measurements place the object 335 light years away<ref name = GaiaDR3/> and it is currently receding with a heliocentric radial velocity of {{val|13.8|ul=km/s}}.<ref name ="Zúñiga-Fernández2020"/> At its current distance, T Cha's average brightness is diminished by 0.31 magnitudes due to extinction from interstellar dust. It has an average absolute magnitude of +6.55.<ref name = Anderson2012/>
==History== The object was first suspected to be a RW Aurigae-type star in 1949.<ref name = Hoffmeister1949/> It was categorized as a T-Tauri star in 1975. In the same year, it was suspected to be variable and the variability was confirmed in 1976.<ref name = Glasby1976/> A 1993 paper said that it might be a weak-lined YY Orionis star.<ref name = Alcala1993/> T Cha might be either a member of the young ε Chamaeleontis association or the slightly older η Chamaeleontis association.<ref name = Murphy2013/><ref name ="Zúñiga-Fernández2020"/> T Cha is an Orion variable that fluctuates between 10.05 and 14.5.<ref name = ASSVO/><ref name = Samus2017/>
==Physical characteristics== T Cha has a stellar classification of K0e,<ref name = Torres2006/> indicating that it is a K-type star with emission lines in its spectrum. It is currently on the T Tauri stage,<ref name = Mauder1975/> accreting matter at a rate of {{val|3.16e-9}} to {{val|1.26e-8|ul=solar mass}}/yr.<ref name = Cahill2019/> It has 65% the mass of the Sun<ref name = Baron2019/> but the radius is highly uncertain. Estimates range from 0.65 to 4.36 times the radius of the Sun.<ref name = Kervella2004/><ref name = Stassun2019/> It radiates 29% the luminosity of the Sun<ref name = Sartori2003/> from its photosphere at an effective temperature of {{val|5111|ul=K|fmt=commas}},<ref name="da Silva2009"/> giving it an orange hue. T Cha has a poorly constrained metallicity of [Fe/H] = +0.09<ref name = Bochanski2018/> and it spins modestly with a projected rotational velocity of {{val|39|ul=km/s}}.<ref name = Covino1997/>
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==References== {{reflist||refs=
<ref name = GaiaDR3>{{Cite DR3|5199981334076455680}}</ref>
<ref name = Torres2006>{{cite journal | 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. | title = Search for associations containing young stars (SACY). I. Sample and searching method | journal = Astronomy & Astrophysics | date = 12 September 2006 | volume = 460 | issue = 3 | pages = 695–708 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361:20065602 | bibcode = 2006A&A...460..695T | arxiv = astro-ph/0609258 | s2cid = 16080025 | doi-access = free}}</ref>
<ref name = Samus2017>{{cite journal | last1 = Samus’ | first1 = N. N. | last2 = Kazarovets | first2 = E. V. | last3 = Durlevich | first3 = O. V. | last4 = Kireeva | first4 = N. N. | last5 = Pastukhova | first5 = E. N. | title = General catalogue of variable stars: Version GCVS 5.1 | journal = Astronomy Reports | date = January 2017 | volume = 61 | issue = 1 | pages = 80–88 | issn = 1063-7729 | eissn = 1562-6881 | doi = 10.1134/S1063772917010085 | bibcode = 2017ARep...61...80S| s2cid = 125853869 }}</ref>
<ref name = Glass1974>{{cite journal | last1 = Glass | first1 = I. S. | last2 = Pension | first2 = M. V. | title = An Infrared Survey of RW Aurigae Stars | journal = Monthly Notices of the Royal Astronomical Society | date = 1 May 1974 | volume = 167 | issue = 2 | pages = 237–249 | issn = 0035-8711 | eissn = 1365-2966 | doi = 10.1093/mnras/167.2.237 | bibcode = 1974MNRAS.167..237G | s2cid = 120222716 | doi-access = free}}</ref>
<ref name = Mauder1975>{{cite journal|bibcode=1975IBVS.1049....1M |title=Light Changes of T Tauri Stars in the Chamaeleon Association |last1=Mauder |first1=H. |last2=Sosna |first2=F. M. |journal=Information Bulletin on Variable Stars |year=1975 |volume=1049 |page=1 }}</ref>
<ref name = Anderson2012>{{cite journal | last1 = Anderson | first1 = E. | last2 = Francis | first2 = Ch. | title = XHIP: An extended hipparcos compilation | journal = Astronomy Letters | date = May 2012 | volume = 38 | issue = 5 | pages = 331–346 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773712050015 | bibcode = 2012AstL...38..331A | arxiv = 1108.4971| s2cid = 119257644 }}</ref>
<ref name ="Zúñiga-Fernández2020">{{cite journal | last1 = Zúñiga-Fernández | first1 = S. | last2 = Bayo | first2 = A. | last3 = Elliott | first3 = P. | last4 = Zamora | first4 = C. | last5 = Corvalán | first5 = G. | last6 = Haubois | first6 = X. | last7 = Corral-Santana | first7 = J. M. | last8 = Olofsson | first8 = J. | last9 = Huélamo | first9 = N. | last10 = Sterzik | first10 = M. F. | last11 = Torres | first11 = C. A. O. | last12 = Quast | first12 = G. R. | last13 = Melo | first13 = C. H. F. | title = Search for associations containing young stars (SACY) | journal = Astronomy & Astrophysics | date = 24 December 2020 | volume = 645 | page = A30 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/202037830 | bibcode = 2021A&A...645A..30Z | arxiv = 2010.08575 | s2cid = 239745123 | doi-access = free}}</ref>
<ref name = Covino1997>{{cite journal| bibcode = 1997A&A...328..187C| title = A study of the Chamaeleon star-forming region from the ROSAT all-sky survey. III. High resolution spectroscopic study| last1 = Covino| first1 = E.| last2 = Alcala| first2 = J. M.| last3 = Allain| first3 = S.| last4 = Bouvier| first4 = J.| last5 = Terranegra| first5 = L.| last6 = Krautter| first6 = J.| journal = Astronomy and Astrophysics| year = 1997 | issn = 0004-6361 | volume = 328| page = 187}}</ref>
<ref name = Bastian1979>{{cite journal| bibcode = 1979A&AS...36...57B | title = UBV photometry of T Tauri stars and related objects | last1 = Bastian | first1 = U. | last2 = Mundt | first2 = R. | journal = Astronomy and Astrophysics Supplement Series | year = 1979 | issn = 0365-0138 | s2cid = 118968842 | volume = 36 | page = 57}}</ref>
<ref name="da Silva2009">{{cite journal | last1 = da Silva | first1 = L. | last2 = Torres | first2 = C. A. O. | last3 = de la Reza | first3 = R. | last4 = Quast | first4 = G. R. | last5 = Melo | first5 = C. H. F. | last6 = Sterzik | first6 = M. F. | title = Search for associations containing young stars (SACY) | journal = Astronomy & Astrophysics | date = 8 October 2009 | volume = 508 | issue = 2 | pages = 833–839 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/200911736 | bibcode = 2009A&A...508..833D | arxiv = 0909.0677 | doi-access = free}}</ref>
<ref name = ASSVO>{{cite web | url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=9240 | title=VSX : Detail for T Cha |access-date=2023-01-08 }}</ref>
<ref name = Baron2019>{{cite journal | last1 = Baron | first1 = Frédérique | last2 = Lafrenière | first2 = David | last3 = Artigau | first3 = Étienne | last4 = Gagné | first4 = Jonathan | last5 = Rameau | first5 = Julien | last6 = Delorme | first6 = Philippe | last7 = Naud | first7 = Marie-Eve | title = Constraints on the Occurrence and Distribution of 1–20 ''M'' <sub>Jup</sub> Companions to Stars at Separations of 5–5000 au from a Compilation of Direct Imaging Surveys| journal = The Astronomical Journal | date = 17 October 2019 | volume = 158 | issue = 5 | page = 187 | eissn = 1538-3881 | doi = 10.3847/1538-3881/ab4130 | bibcode = 2019AJ....158..187B | arxiv = 1909.06255 | s2cid = 202572902 | doi-access = free}}</ref>
<ref name = Murphy2013>{{cite journal | last1 = Murphy | first1 = Simon J. | last2 = Lawson | first2 = Warrick A. | last3 = Bessell | first3 = Michael S. | title = Re-examining the membership and origin of the ϵ Cha association | journal = Monthly Notices of the Royal Astronomical Society | date = 20 August 2013 | volume = 435 | issue = 2 | pages = 1325–1349 | issn = 0035-8711 | eissn = 1365-2966 | doi = 10.1093/mnras/stt1375 | bibcode = 2013MNRAS.435.1325M | arxiv = 1305.4177 | s2cid = 55556494 | doi-access = free}}</ref>
<ref name = Sartori2003>{{cite journal | last1 = Sartori | first1 = M. J. | last2 = Lépine | first2 = J. R. D. | last3 = Dias | first3 = W. S. | title = Formation scenarios for the young stellar associations between galactic longitudes l = ''280° - 360°'' | journal = Astronomy & Astrophysics | date = June 2003 | volume = 404 | issue = 3 | pages = 913–926 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361:20030581 | bibcode = 2003A&A...404..913S | arxiv = astro-ph/0304426 | s2cid = 17411999 | doi-access = free}}</ref>
<ref name = Bochanski2018>{{cite journal | last1 = Bochanski | first1 = John J. | last2 = Faherty | first2 = Jacqueline K. | last3 = Gagné | first3 = Jonathan | last4 = Nelson | first4 = Olivia | last5 = Coker | first5 = Kristina | last6 = Smithka | first6 = Iliya | last7 = Desir | first7 = Deion | last8 = Vasquez | first8 = Chelsea | title = Fundamental Properties of Co-moving Stars Observed by''Gaia'' | journal = The Astronomical Journal | date = 12 March 2018 | volume = 155 | issue = 4 | page = 149 | eissn = 1538-3881 | doi = 10.3847/1538-3881/aaaebe | bibcode = 2018AJ....155..149B | arxiv = 1801.00537 | doi-access = free}}</ref>
<ref name = Stassun2019>{{cite journal | display-authors = 1 | last1 = Stassun | first1 = Keivan G. | last2 = Oelkers | first2 = Ryan J. | last3 = Paegert | first3 = Martin | last4 = Torres | first4 = Guillermo | last5 = Pepper | first5 = Joshua | last6 = Lee | first6 = Nathan De | last7 = Collins | first7 = Kevin | last8 = Latham | first8 = David W. | last9 = Muirhead | first9 = Philip S. | last10 = Chittidi | first10 = Jay | last11 = Rojas-Ayala | first11 = Bárbara | last12 = Fleming | first12 = Scott W. | last13 = Rose | first13 = Mark E. | last14 = Tenenbaum | first14 = Peter | last15 = Ting | first15 = Eric B. | last16 = Kane | first16 = Stephen R. | last17 = Barclay | first17 = Thomas | last18 = Bean | first18 = Jacob L. | last19 = Brassuer | first19 = C. E. | last20 = Charbonneau | first20 = David | last21 = Ge | first21 = Jian | last22 = Lissauer | first22 = Jack J. | last23 = Mann | first23 = Andrew W. | last24 = McLean | first24 = Brian | last25 = Mullally | first25 = Susan | last26 = Narita | first26 = Norio | last27 = Plavchan | first27 = Peter | last28 = Ricker | first28 = George R. | last29 = Sasselov | first29 = Dimitar | last30 = Seager | first30 = S. | last31 = Sharma | first31 = Sanjib | last32 = Shiao | first32 = Bernie | last33 = Sozzetti | first33 = Alessandro | last34 = Stello | first34 = Dennis | last35 = Vanderspek | first35 = Roland | last36 = Wallace | first36 = Geoff | last37 = Winn | first37 = Joshua N. | title = The Revised ''TESS'' Input Catalog and Candidate Target List | journal = The Astronomical Journal | date = 9 September 2019 | volume = 158 | issue = 4 | page = 138 | eissn = 1538-3881 | doi = 10.3847/1538-3881/ab3467 | bibcode = 2019AJ....158..138S | arxiv = 1905.10694 | s2cid = 166227927 | hdl = 1721.1/124721 | hdl-access = free | doi-access = free}}</ref>
<ref name = Kervella2004>{{cite journal | last1 = Kervella | first1 = P. | last2 = Thévenin | first2 = F. | last3 = Di Folco | first3 = E. | last4 = Ségransan | first4 = D. | title = The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry | journal = Astronomy & Astrophysics | date = October 2004 | volume = 426 | issue = 1 | pages = 297–307 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361:20035930 | bibcode = 2004A&A...426..297K | arxiv = astro-ph/0404180 | s2cid = 6077801 | doi-access = free}}</ref>
<ref name = Cahill2019>{{cite journal | last1 = Cahill | first1 = Eoin | last2 = Whelan | first2 = Emma T | last3 = Huelamo | first3 = Nuria | last4 = Alcala | first4 = Juan | title = UVES Spectroscopy of T Chamaeleontis: Line Variability, Mass Accretion rate and Spectro-astrometric Analysis★ | journal = Monthly Notices of the Royal Astronomical Society | date = 28 January 2019 | volume = 484 | issue = 3 | page = 4315 | issn = 0035-8711 | eissn = 1365-2966 | doi = 10.1093/mnras/stz280 | bibcode = 2019MNRAS.484.4315C | arxiv = 1902.01170 | s2cid = 118944630 | doi-access = free}}</ref>
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<ref name = Alcala1993>{{cite journal | bibcode = 1993A&A...272..225A | title = T Chamaeleontis : A "weak-line" YY Orionis star ? | last1 = Alcala | first1 = J. M. | last2 = Covino | first2 = E. | last3 = Franchini | first3 = M. | last4 = Krautter | first4 = J. | last5 = Terranegra | first5 = L. | last6 = Wichmann | first6 = R. | journal = Astronomy and Astrophysics | s2cid = 122408037 | date = May 1993 | volume = 272 | page = 225}}</ref>
<ref name="aavso">{{cite web |title=Download Data |url=https://www.aavso.org/data-download |website=aavso.org |publisher=AAVSO |access-date=1 October 2021}}</ref>
}} {{Stars of Chamaeleon}}
Category:T Tauri stars Chamaeleontis, T Category:Orion variables Category:Chamaeleon 058285 Category:Hypothetical planets Category:Emission-line stars