DI Chamaeleontis

DI Chamaeleontis

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]
Distanceapprox. 700 ly
(approx. 220 pc)
Details[5]
Aa
Mass1.7 M☉
Radius2.00 R☉
Luminosity4.7 L☉
Temperature6,030 K
Age7.1 Myr
Ba/Bb
Mass0.18 M☉
Radius1.13 R☉
Luminosity0.11 L☉
Temperature3,130 K
Age3.0 Myr
Other designations
DI Cha, HIP 54365, CD−76°486, WDS J11073-7738, AAVSO 1104-77
Database references
SIMBADdata

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,[6]

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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