T Chamaeleontis

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T Chamaeleontis
File: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]
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
T Cha, HIP 58285, TYC 9419-1187-1, GSC 09419-01187, 2MASS J11571348-7921313
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

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The object was first suspected to be a RW Aurigae-type star in 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

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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

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  1. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  2. ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
  3. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  4. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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  13. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  14. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  15. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  16. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  17. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  18. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  19. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  20. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  21. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  22. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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