Astronomy:DI Chamaeleontis
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Short description: Star in the constellation Chamaleon
 Image showing DI Cha A and B, each of which is also an even closer binary, and the surrounding nebulosity. | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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☉ |
| Luminosity | 0.11 L☉ |
| Temperature | 3,130 K |
| Age | 3.0 Myr |
| Other designations | |
| 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]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 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.
- ↑ 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. doi:10.1051/0004-6361:20065602. Bibcode: 2006A&A...460..695T.
- ↑ 4.0 4.1 Samus, N. N. 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.
- ↑ 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. doi:10.1051/0004-6361/201321220. Bibcode: 2013A&A...554A..43D.
- ↑ Henize, Karl G. (1963). "Emission-Line Stars in an Obscured Region in Chamaeleon". Astronomical Journal 68: 280. doi:10.1086/109141. Bibcode: 1963AJ.....68S.280H. http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963AJ.....68S.280H&link_type=ARTICLE&db_key=AST&high=.
- ↑ 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. doi:10.1086/190473. Bibcode: 1977ApJS...35..161S.
- ↑ Reipurth, Bo; Zinnecker, Hans (1993). "Visual binaries among pre-main sequence stars". Astronomy and Astrophysics 278: 81. Bibcode: 1993A&A...278...81R.
- ↑ 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. doi:10.1086/590239. Bibcode: 2008ApJ...683..844L.
- ↑ 10.0 10.1 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. doi:10.1051/0004-6361/201220660. Bibcode: 2013A&A...557A..80S.
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