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DI Chamaeleontis, also known as Hen 3-593 or HIP 54365, is a quadruple star system in the constellation Chamaeleon. The system is located 616 light years away from Earth based on Gaia DR3 parallax measurements.[1]

A light curve for DI Chamaeleontis, plotted from TESS data,[11]

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.[7] Although it is visually faint, it was noticed because of the prominent emission lines in its spectrum.[12]

In 1977, DI Cha was observed to have a much fainter companion.[13] The separation was later measured at 4.6″, approximately 644 astronomical units (AU).[14] The B component was discovered to be a pair of stars separated by only 0.066″, about 10 AU,[15] both with spectral type M5.5.[5] Finally, the variable primary star was found to have a faint companion 0.2″ (therefore ~30 AU) away, of spectral type M6.[5]

References

  1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). “Gaia Data Release 3. Summary of the content and survey properties”. Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A…674A…1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b Tokovinin, Andrei (2018). “The Updated Multiple Star Catalog”. The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235….6T. doi:10.3847/1538-4365/aaa1a5.
  3. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). “Gaia Data Release 3. Summary of the content and survey properties”. Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A…674A…1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  4. ^ 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.
  5. ^ a b c 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.
  6. ^ a b 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.
  7. ^ a b 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.
  8. ^ Nguyen, Duy Cuong; Brandeker, Alexis; van Kerkwijk, Marten H.; Jayawardhana, Ray (February 2012). “Close Companions to Young Stars. I. A Large Spectroscopic Survey in Chamaeleon I and Taurus-Auriga”. The Astrophysical Journal. 745 (2): 25. arXiv:1112.0002. Bibcode:2012ApJ…745..119N. doi:10.1088/0004-637X/745/2/119. S2CID 119265730. 119.
  9. ^ Gutiérrez Albarrán, M. L.; et al. (2020). “The Gaia-ESO Survey: Calibrating the lithium-age relation with open clusters and associations. I. Cluster age range and initial membership selections”. Astronomy and Astrophysics. 643: A71. arXiv:2009.00610. Bibcode:2020A&A…643A..71G. doi:10.1051/0004-6361/202037620.
  10. ^ 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.
  11. ^ “MAST: Barbara A. Mikulski Archive for Space Telescopes”. Space Telescope Science Institute. Retrieved 27 August 2024.
  12. ^ 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.
  13. ^ 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.
  14. ^ Reipurth, Bo; Zinnecker, Hans (1993). “Visual binaries among pre-main sequence stars”. Astronomy and Astrophysics. 278: 81. Bibcode:1993A&A…278…81R.
  15. ^ 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.