T Chamaeleontis

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T Chamaeleontis
TChaLightCurve.png
A visual band light curve for T Chamaeleontis, plotted from AAVSO data [1]
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 11h 57m 13.52451s [2]
Declination −79° 21′ 31.5305″ [2]
Apparent magnitude  (V)10.05 - 14.50 [3]
Characteristics
Evolutionary stage T Tauri star [4]
Spectral type K0e [5]
U−B color index +0.63 [6]
B−V color index +1.14 [6]
J−K color index +1.67 [7]
Variable type Orion variable [8]
Astrometry
Radial velocity (Rv)13.8±0.1 [9]  km/s
Proper motion (μ)RA: −41.586  mas/yr [2]
Dec.: −8.655  mas/yr [2]
Parallax (π)9.7356 ± 0.0332  mas [2]
Distance 335 ± 1  ly
(102.7 ± 0.4  pc)
Absolute magnitude  (MV)+6.55 [10]
Details
Mass 0.65 [11]   M☉
Radius 0.65±0.09 [12]   R☉
Luminosity 0.29 [13]   L☉
Surface gravity (log g)4.50 [13]   cgs
Temperature 5,111 [14]   K
Metallicity [Fe/H]+0.09±0.15 [15]   dex
Rotational velocity (v sin i)39±3 [16]  km/s
Age 12.7 [17]   Myr
Other designations
T Cha, HIP  58285, TYC  9419-1187-1, GSC  09419-01187, 2MASS J11571348-7921313
Database references
SIMBAD data

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, [3] which is below the limit for naked eye visibility. Gaia DR3 parallax measurements place the object 335 light years away [2] and it is currently receding with a heliocentric radial velocity of 13.8  km/s . [9] 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. [10]

Contents

History

The object was first suspected to be a RW Aurigae-type star since 1949. [18] 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. [19] A 1993 paper said that it might be a weak-lined YY Orionis star. [20] T Cha might be either a member of the young ε Chamaeleontis association or the slightly older η Chamaeleontis association. [17] [9] T Cha is an Orion variable that fluctuates between 10.05 and 14.5. [3] [8]

Physical characteristics

T Cha has a stellar classification of K0e, [5] indicating that it is a K-type star with emission lines in its spectrum. It is currently on the T Tauri stage, [4] accreting matter at a rate of 3.16×10−9 to 1.26×10−8  M☉ /yr. [21] It has 65% the mass of the Sun [11] but the radius is highly uncertain. Estimates range from 0.65 to 4.36 times the radius of the Sun. [22] [12] It radiates 29% the luminosity of the Sun [13] from its photosphere at an effective temperature of 5,111  K , [14] giving it an orange hue. T Cha has a poorly constrained metallicity of [Fe/H] = +0.09 [15] and it spins modestly with a projected rotational velocity of 39  km/s . [16]


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<span class="mw-page-title-main">Epsilon Chamaeleontis</span> Star in the constellation Chamaeleon

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<span class="mw-page-title-main">HD 26764</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">HD 27022</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">HD 76236</span> Star in the constellation Chamaeleon

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<span class="mw-page-title-main">DR Chamaeleontis</span> Binary star in the constellation Chamaeleon

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<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

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References

  1. ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 "VSX : Detail for T Cha" . Retrieved 2023-01-08.
  4. 1 2 Mauder, H.; Sosna, F. M. (1975). "Light Changes of T Tauri Stars in the Chamaeleon Association". Information Bulletin on Variable Stars. 1049: 1. Bibcode:1975IBVS.1049....1M.
  5. 1 2 Torres, C. A. O.; Quast, G. R.; da Silva, L.; de la Reza, R.; Melo, C. H. F.; Sterzik, M. (12 September 2006). "Search for associations containing young stars (SACY). I. Sample and searching method". Astronomy & Astrophysics. 460 (3): 695–708. arXiv: astro-ph/0609258 . Bibcode:2006A&A...460..695T. doi: 10.1051/0004-6361:20065602 . eISSN   1432-0746. ISSN   0004-6361. S2CID   16080025.
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  7. ↑ Glass, I. S.; Pension, M. V. (1 May 1974). "An Infrared Survey of RW Aurigae Stars". Monthly Notices of the Royal Astronomical Society. 167 (2): 237–249. Bibcode:1974MNRAS.167..237G. doi: 10.1093/mnras/167.2.237 . eISSN   1365-2966. ISSN   0035-8711. S2CID   120222716.
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  12. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  13. 1 2 3 Sartori, M. J.; Lépine, J. R. D.; Dias, W. S. (June 2003). "Formation scenarios for the young stellar associations between galactic longitudes l = 280° - 360°". Astronomy & Astrophysics. 404 (3): 913–926. arXiv: astro-ph/0304426 . Bibcode:2003A&A...404..913S. doi: 10.1051/0004-6361:20030581 . eISSN   1432-0746. ISSN   0004-6361. S2CID   17411999.
  14. 1 2 da Silva, L.; Torres, C. A. O.; de la Reza, R.; Quast, G. R.; Melo, C. H. F.; Sterzik, M. F. (8 October 2009). "Search for associations containing young stars (SACY)". Astronomy & Astrophysics. 508 (2): 833–839. arXiv: 0909.0677 . Bibcode:2009A&A...508..833D. doi: 10.1051/0004-6361/200911736 . eISSN   1432-0746. ISSN   0004-6361.
  15. 1 2 Bochanski, John J.; Faherty, Jacqueline K.; Gagné, Jonathan; Nelson, Olivia; Coker, Kristina; Smithka, Iliya; Desir, Deion; Vasquez, Chelsea (12 March 2018). "Fundamental Properties of Co-moving Stars Observed byGaia". The Astronomical Journal. 155 (4): 149. arXiv: 1801.00537 . Bibcode:2018AJ....155..149B. doi: 10.3847/1538-3881/aaaebe . eISSN   1538-3881.
  16. 1 2 Covino, E.; Alcala, J. M.; Allain, S.; Bouvier, J.; Terranegra, L.; Krautter, J. (1997). "A study of the Chamaeleon star-forming region from the ROSAT all-sky survey. III. High resolution spectroscopic study". Astronomy and Astrophysics. 328: 187. Bibcode:1997A&A...328..187C. ISSN   0004-6361.
  17. 1 2 Murphy, Simon J.; Lawson, Warrick A.; Bessell, Michael S. (20 August 2013). "Re-examining the membership and origin of the ϵ Cha association". Monthly Notices of the Royal Astronomical Society. 435 (2): 1325–1349. arXiv: 1305.4177 . Bibcode:2013MNRAS.435.1325M. doi: 10.1093/mnras/stt1375 . eISSN   1365-2966. ISSN   0035-8711. S2CID   55556494.
  18. ↑ Hoffmeister, C. (1949). "Die RW Aurigae'Sterne und ihre Nebenformen". Astronomische Nachrichten (in German). 278 (1): 24–40. Bibcode:1949AN....278...24H. doi:10.1002/asna.19492780102. eISSN   1521-3994. ISSN   0004-6337. S2CID   122025222.
  19. ↑ Glasby, J. S. (1976). "The nebular variables". Journal of the British Astronomical Association. 86: 344. Bibcode:1976JBAA...86..344G.
  20. ↑ Alcala, J. M.; Covino, E.; Franchini, M.; Krautter, J.; Terranegra, L.; Wichmann, R. (May 1993). "T Chamaeleontis : A "weak-line" YY Orionis star ?". Astronomy and Astrophysics. 272: 225. Bibcode:1993A&A...272..225A. S2CID   122408037.
  21. ↑ Cahill, Eoin; Whelan, Emma T; Huelamo, Nuria; Alcala, Juan (28 January 2019). "UVES Spectroscopy of T Chamaeleontis: Line Variability, Mass Accretion rate and Spectro-astrometric Analysis★". Monthly Notices of the Royal Astronomical Society. 484 (3): 4315. arXiv: 1902.01170 . Bibcode:2019MNRAS.484.4315C. doi: 10.1093/mnras/stz280 . eISSN   1365-2966. ISSN   0035-8711. S2CID   118944630.
  22. ↑ Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361. S2CID   6077801.
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