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
A
Right ascension 11h 07m 20.72761s [1]
Declination −77° 38′ 07.3081″ [1]
Apparent magnitude  (V)10.72 [2]
A
Right ascension 11h 07m 20.18917s [3]
Declination −77° 38′ 11.5657″ [3]
Apparent magnitude  (V)16.7 [2]
Characteristics
Spectral type G0e [4] (G2 + M6 + M5.5 + M5.5) [5]
U−B color index +0.630 [6]
B−V color index +1.144 [6]
Variable type T Tau [7]
Astrometry
A
Radial velocity (Rv)+12.040±0.140 [8] km/s
Proper motion (μ)RA: −22.552 mas/yr [1]
Dec.: +1.214 mas/yr [1]
Parallax (π)5.2913±0.0133  mas [1]
Distance 616 ± 2  ly
(189.0 ± 0.5  pc)
B
Radial velocity (Rv)+15.5±0.3 [9] km/s
Proper motion (μ)RA: −21.477 mas/yr [3]
Dec.: +1.289 mas/yr [3]
Parallax (π)5.2190±0.0719  mas [3]
Distance 625 ± 9  ly
(192 ± 3  pc)
Details [10]
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
B

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, 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. [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. 1 2 3 4 5 6 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. 1 2 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. 1 2 3 4 5 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. 1 2 3 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. 1 2 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. 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.
  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.
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