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.

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. [6]

In 1977, DI Cha was observed to have a much fainter companion. [7] The separation was later measured at 4.6", approximately 644 astronomical units (AU). [8] The B component was discovered to be a pair of stars separated by only 0.066", about 10 AU, [9] both with spectral type M5.5. [10] Finally, the variable primary star was found to have a faint companion 0.2" (therefore ~30 AU) away, of spectral type M6. [10]

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References

  1. 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600.
  2. 1 2 3 Kilkenny, D.; Whittet, D. C. B.; Davies, J. K.; Evans, A.; Bode, M. F.; Robson, E. I.; Banfield, R. M. (1985). "Optical and infrared photometry of southern early-type shell stars and pre-main-sequence variables". In Its South African Astronomical Observatory Circular No. 9 P 55-86 (SEE N86-18271 08-89). 9: 55. Bibcode:1985SAAOC...9...55K.
  3. Torres, C. A. O.; Quast, G. R.; Da Silva, L.; de la Reza, R.; Melo, C. H. F.; Sterzik, M. (2006). "Search for associations containing young stars (SACY). I. Sample and searching method". Astronomy and Astrophysics. 460 (3): 695. arXiv: astro-ph/0609258 . Bibcode:2006A&A...460..695T. doi:10.1051/0004-6361:20065602. S2CID   16080025.
  4. 1 2 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. Daemgen, S.; Petr-Gotzens, M. G.; Correia, S.; Teixeira, P. S.; Brandner, W.; Kley, W.; Zinnecker, H. (2013). "Protoplanetary disk evolution and stellar parameters of T Tauri binaries in Chamaeleon I". Astronomy & Astrophysics. 554: A43. arXiv: 1304.1150 . Bibcode:2013A&A...554A..43D. doi:10.1051/0004-6361/201321220. S2CID   59440639.
  6. Henize, Karl G. (1963). "Emission-Line Stars in an Obscured Region in Chamaeleon". Astronomical Journal. 68: 280. Bibcode:1963AJ.....68S.280H. doi:10.1086/109141.
  7. Schwartz, R. D. (1977). "A survey of southern dark clouds for Herbig-Haro objects and H-alpha emission stars". Astrophysical Journal Supplement Series. 35: 161. Bibcode:1977ApJS...35..161S. doi:10.1086/190473.
  8. Reipurth, Bo; Zinnecker, Hans (1993). "Visual binaries among pre-main sequence stars". Astronomy and Astrophysics. 278: 81. Bibcode:1993A&A...278...81R.
  9. Lafrenière, David; Jayawardhana, Ray; Brandeker, Alexis; Ahmic, Mirza; Van Kerkwijk, Marten H. (2008). "A Multiplicity Census of Young Stars in Chamaeleon I". The Astrophysical Journal. 683 (2): 844–861. arXiv: 0803.0561 . Bibcode:2008ApJ...683..844L. doi:10.1086/590239. S2CID   2998049.
  10. 1 2 Schmidt, T. O. B.; Vogt, N.; Neuhäuser, R.; Bedalov, A.; Roell, T. (2013). "New companions in the stellar systems of DI Cha, Sz 22, CHXR 32, and Cha Hα 5 in the Chamaeleon I star-forming region". Astronomy & Astrophysics. 557: A80. arXiv: 1307.1082 . Bibcode:2013A&A...557A..80S. doi:10.1051/0004-6361/201220660. S2CID   67802847.