DI Chamaeleontis

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DI Chamaeleontis
Variable Star DI Cha.jpg
Image showing DI Cha A and B, each of which is also an even closer binary, and the surrounding nebulosity.
Observation data
Epoch J2000       Equinox J2000
Constellation Chamaeleon
Right ascension 11h 07m 20.72163s [1]
Declination 77° 38 07.2903 [1]
Apparent magnitude  (V)10.655 [2]
Characteristics
Spectral type G0e [3]
U−B color index +0.630 [2]
B−V color index +1.144 [2]
Variable type T Tau [4]
Astrometry
Proper motion (μ)RA: 24.61 [1]   mas/yr
Dec.: 3.45 [1]   mas/yr
Parallax (π)4.49 ± 1.59  mas [1]
Distance approx. 700  ly
(approx. 220  pc)
Details [5]
Aa
Mass 1.7  M
Radius 2.00  R
Luminosity 4.7  L
Temperature 6,030  K
Age 7.1  Myr
Ba/Bb
Mass 0.18  M
Radius 1.13  R
Luminosity0.11  L
Temperature 3,130  K
Age 3.0  Myr
Other designations
DI  Cha, HIP  54365, CD 76°486, WDS  J11073-7738, AAVSO  1104-77
Database references
SIMBAD data

DI Chamaeleontis, also known as Hen 3-593 or HIP 54365, is a quadruple star system in the constellation Chamaeleon. The system is roughly 700 light years from Earth.

A light curve for DI Chamaeleontis, plotted from TESS data, DIChaLightCurve.png
A light curve for DI Chamaeleontis, plotted from TESS data,

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. [4] Although it is visually faint, it was noticed because of the prominent emission lines in its spectrum. [7]

In 1977, DI Cha was observed to have a much fainter companion. [8] The separation was later measured at 4.6", approximately 644 astronomical units (AU). [9] The B component was discovered to be a pair of stars separated by only 0.066", about 10 AU, [10] both with spectral type M5.5. [11] Finally, the variable primary star was found to have a faint companion 0.2" (therefore ~30 AU) away, of spectral type M6. [11]

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References

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