Astronomy:T Chamaeleontis

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Short description: T Tauri star; Chamaeleon
T Chamaeleontis
TChaLightCurve.png
A visual band light curve for T Chamaeleontis, plotted from AAVSO data[1]
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
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[2] mas/yr
Dec.: −8.655[2] mas/yr
Parallax (π)9.7356 ± 0.0332[2] mas
Distance335 ± 1 ly
(102.7 ± 0.4 pc)
Absolute magnitude (MV)+6.55[10]
Details
Mass0.65[11] M☉
Radius0.65±0.09[12] R☉
Luminosity0.29[13] L☉
Surface gravity (log g)4.50[13] cgs
Temperature5,111[14] K
Metallicity [Fe/H]+0.09±0.15[15] dex
Rotational velocity (v sin i)39±3[16] km/s
Age12.7[17] Myr
Other designations
Database references
SIMBADdata

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]

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]


References

  1. ↑ "Download Data". AAVSO. https://www.aavso.org/data-download. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 "VSX : Detail for T Cha". https://www.aavso.org/vsx/index.php?view=detail.top&oid=9240. 
  4. ↑ 4.0 4.1 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. ↑ 5.0 5.1 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. doi:10.1051/0004-6361:20065602. ISSN 0004-6361. Bibcode: 2006A&A...460..695T. 
  6. ↑ 6.0 6.1 Bastian, U.; Mundt, R. (1979). "UBV photometry of T Tauri stars and related objects". Astronomy and Astrophysics Supplement Series 36: 57. ISSN 0365-0138. Bibcode: 1979A&AS...36...57B. 
  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. doi:10.1093/mnras/167.2.237. ISSN 0035-8711. Bibcode: 1974MNRAS.167..237G. 
  8. ↑ 8.0 8.1 Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80–88. doi:10.1134/S1063772917010085. ISSN 1063-7729. Bibcode: 2017ARep...61...80S. 
  9. ↑ 9.0 9.1 9.2 Zúñiga-Fernández, S.; Bayo, A.; Elliott, P.; Zamora, C.; Corvalán, G.; Haubois, X.; Corral-Santana, J. M.; Olofsson, J. et al. (24 December 2020). "Search for associations containing young stars (SACY)". Astronomy & Astrophysics 645: A30. doi:10.1051/0004-6361/202037830. ISSN 0004-6361. Bibcode: 2021A&A...645A..30Z. 
  10. ↑ 10.0 10.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  11. ↑ 11.0 11.1 Baron, Frédérique; Lafrenière, David; Artigau, Étienne; Gagné, Jonathan; Rameau, Julien; Delorme, Philippe; Naud, Marie-Eve (17 October 2019). "Constraints on the Occurrence and Distribution of 1–20 M Jup Companions to Stars at Separations of 5–5000 au from a Compilation of Direct Imaging Surveys". The Astronomical Journal 158 (5): 187. doi:10.3847/1538-3881/ab4130. Bibcode: 2019AJ....158..187B. 
  12. ↑ 12.0 12.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  13. ↑ 13.0 13.1 13.2 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. doi:10.1051/0004-6361:20030581. ISSN 0004-6361. Bibcode: 2003A&A...404..913S. 
  14. ↑ 14.0 14.1 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. doi:10.1051/0004-6361/200911736. ISSN 0004-6361. Bibcode: 2009A&A...508..833D. 
  15. ↑ 15.0 15.1 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. doi:10.3847/1538-3881/aaaebe. Bibcode: 2018AJ....155..149B. 
  16. ↑ 16.0 16.1 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. ISSN 0004-6361. Bibcode: 1997A&A...328..187C. 
  17. ↑ 17.0 17.1 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. doi:10.1093/mnras/stt1375. ISSN 0035-8711. Bibcode: 2013MNRAS.435.1325M. 
  18. ↑ Hoffmeister, C. (1949). "Die RW Aurigae'Sterne und ihre Nebenformen" (in de). Astronomische Nachrichten 278 (1): 24–40. doi:10.1002/asna.19492780102. ISSN 0004-6337. Bibcode: 1949AN....278...24H. 
  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. 
  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. doi:10.1093/mnras/stz280. ISSN 0035-8711. Bibcode: 2019MNRAS.484.4315C. 
  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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 



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